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fmt/test/format-test.cc
Murat Toprak 0d145936ec Handle allocator propagation in basic_memory_buffer::move, Fix #4487 (#4490) 
* Handle allocator propagation in basic_memory_buffer::move

Update `basic_memory_buffer::move` to respect `propagate_on_container_move_assignment`allocator trait.
If the allocator should not propagate and differs from the target's allocator,
fallback to copying the buffer instead of transferring ownership.

This avoids potential allocator mismatch issues and ensures exception safety.

* Add test cases for the updated move ctor

- Added two test cases `move_ctor_inline_buffer_non_propagating` and `move_ctor_dynamic_buffer_non_propagating`
- Added `PropageteOnMove` template parameter to `allocator_ref` class to be compatible with the old test cases
- `allocator_ref` now implements `!=` and `==` operators
2025-08-09 08:14:15 -07:00

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// Formatting library for C++ - formatting library tests
//
// Copyright (c) 2012 - present, Victor Zverovich
// All rights reserved.
//
// For the license information refer to format.h.
// Check if fmt/format.h compiles with windows.h included before it.
#ifdef _WIN32
# include <windows.h>
#endif
// clang-format off
#include "fmt/format.h"
// clang-format on
#include <stdint.h> // uint32_t
#include <cfenv> // fegetexceptflag and FE_ALL_EXCEPT
#include <climits> // INT_MAX
#include <cmath> // std::signbit
#include <condition_variable> // std::condition_variable
#include <cstring> // std::strlen
#include <iterator> // std::back_inserter
#include <list> // std::list
#include <mutex> // std::mutex
#include <string> // std::string
#include <thread> // std::thread
#include <type_traits> // std::is_default_constructible
#if FMT_CPLUSPLUS > 201703L && FMT_HAS_INCLUDE(<version>)
# include <version>
#endif
#include <limits.h>
#include <limits>
#include "gtest-extra.h"
#include "mock-allocator.h"
#include "util.h"
using fmt::basic_memory_buffer;
using fmt::format_error;
using fmt::memory_buffer;
using fmt::runtime;
using fmt::string_view;
using fmt::detail::max_value;
using fmt::detail::uint128_fallback;
using testing::Return;
using testing::StrictMock;
#ifdef __cpp_lib_concepts
static_assert(std::output_iterator<fmt::appender, char>);
#endif
enum { buffer_size = 256 };
TEST(uint128_test, ctor) {
auto n = uint128_fallback();
EXPECT_EQ(n, 0);
n = uint128_fallback(42);
EXPECT_EQ(n, 42);
EXPECT_EQ(static_cast<uint64_t>(n), 42);
}
TEST(uint128_test, shift) {
auto n = uint128_fallback(42);
n = n << 64;
EXPECT_EQ(static_cast<uint64_t>(n), 0);
n = n >> 64;
EXPECT_EQ(static_cast<uint64_t>(n), 42);
n = n << 62;
EXPECT_EQ(static_cast<uint64_t>(n >> 64), 0xa);
EXPECT_EQ(static_cast<uint64_t>(n), 0x8000000000000000);
n = n >> 62;
EXPECT_EQ(static_cast<uint64_t>(n), 42);
EXPECT_EQ(uint128_fallback(1) << 112, uint128_fallback(0x1000000000000, 0));
EXPECT_EQ(uint128_fallback(0x1000000000000, 0) >> 112, uint128_fallback(1));
}
TEST(uint128_test, minus) {
auto n = uint128_fallback(42);
EXPECT_EQ(n - 2, 40);
}
TEST(uint128_test, plus_assign) {
auto n = uint128_fallback(32);
n += uint128_fallback(10);
EXPECT_EQ(n, 42);
n = uint128_fallback(max_value<uint64_t>());
n += uint128_fallback(1);
EXPECT_EQ(n, uint128_fallback(1) << 64);
}
TEST(uint128_test, multiply) {
auto n = uint128_fallback(2251799813685247);
n = n * 3611864890;
EXPECT_EQ(static_cast<uint64_t>(n >> 64), 440901);
}
template <typename Float> void check_isfinite() {
using fmt::detail::isfinite;
EXPECT_TRUE(isfinite(Float(0.0)));
EXPECT_TRUE(isfinite(Float(42.0)));
EXPECT_TRUE(isfinite(Float(-42.0)));
EXPECT_TRUE(isfinite(Float(fmt::detail::max_value<double>())));
// Use double because std::numeric_limits is broken for __float128.
using limits = std::numeric_limits<double>;
FMT_CONSTEXPR20 auto result = isfinite(Float(limits::infinity()));
EXPECT_FALSE(result);
EXPECT_FALSE(isfinite(Float(limits::infinity())));
EXPECT_FALSE(isfinite(Float(-limits::infinity())));
EXPECT_FALSE(isfinite(Float(limits::quiet_NaN())));
EXPECT_FALSE(isfinite(Float(-limits::quiet_NaN())));
}
TEST(float_test, isfinite) {
check_isfinite<double>();
#if FMT_USE_FLOAT128
check_isfinite<fmt::detail::float128>();
#endif
}
void check_no_fp_exception() {
fexcept_t fe;
fegetexceptflag(&fe, FE_ALL_EXCEPT);
// No exception flags should have been set
EXPECT_TRUE(fe == 0);
}
template <typename Float> void check_isnan() {
using fmt::detail::isnan;
EXPECT_FALSE(isnan(Float(0.0)));
EXPECT_FALSE(isnan(Float(42.0)));
EXPECT_FALSE(isnan(Float(-42.0)));
EXPECT_FALSE(isnan(Float(fmt::detail::max_value<double>())));
// Use double because std::numeric_limits is broken for __float128.
using limits = std::numeric_limits<double>;
EXPECT_FALSE(isnan(Float(limits::infinity())));
EXPECT_FALSE(isnan(Float(-limits::infinity())));
EXPECT_TRUE(isnan(Float(limits::quiet_NaN())));
EXPECT_TRUE(isnan(Float(-limits::quiet_NaN())));
// Sanity check: make sure no error has occurred before we start
check_no_fp_exception();
// Check that no exception is raised for the non-NaN case
isnan(Float(42.0));
check_no_fp_exception();
// Check that no exception is raised for the NaN case
isnan(Float(limits::quiet_NaN()));
check_no_fp_exception();
}
TEST(float_test, isnan) {
check_isnan<double>();
#if FMT_USE_FLOAT128
check_isnan<fmt::detail::float128>();
#endif
}
struct uint32_pair {
uint32_t u[2];
};
TEST(util_test, bit_cast) {
auto s = fmt::detail::bit_cast<uint32_pair>(uint64_t{42});
EXPECT_EQ(fmt::detail::bit_cast<uint64_t>(s), 42ull);
s = fmt::detail::bit_cast<uint32_pair>(~uint64_t{0});
EXPECT_EQ(fmt::detail::bit_cast<uint64_t>(s), ~0ull);
}
// Increment a number in a string.
void increment(char* s) {
for (int i = static_cast<int>(std::strlen(s)) - 1; i >= 0; --i) {
if (s[i] != '9') {
++s[i];
break;
}
s[i] = '0';
}
}
TEST(util_test, increment) {
char s[10] = "123";
increment(s);
EXPECT_STREQ("124", s);
s[2] = '8';
increment(s);
EXPECT_STREQ("129", s);
increment(s);
EXPECT_STREQ("130", s);
s[1] = s[2] = '9';
increment(s);
EXPECT_STREQ("200", s);
}
TEST(util_test, parse_nonnegative_int) {
auto s = fmt::string_view("10000000000");
auto begin = s.begin(), end = s.end();
EXPECT_EQ(fmt::detail::parse_nonnegative_int(begin, end, -1), -1);
s = "2147483649";
begin = s.begin();
end = s.end();
EXPECT_EQ(fmt::detail::parse_nonnegative_int(begin, end, -1), -1);
}
TEST(util_test, utf8_to_utf16) {
auto u = fmt::detail::utf8_to_utf16("лошадка");
EXPECT_EQ(L"\x043B\x043E\x0448\x0430\x0434\x043A\x0430", u.str());
EXPECT_EQ(7, u.size());
// U+10437 { DESERET SMALL LETTER YEE }
EXPECT_EQ(L"\xD801\xDC37", fmt::detail::utf8_to_utf16("𐐷").str());
EXPECT_THROW_MSG(fmt::detail::utf8_to_utf16("\xc3\x28"), std::runtime_error,
"invalid utf8");
EXPECT_THROW_MSG(fmt::detail::utf8_to_utf16(fmt::string_view("л", 1)),
std::runtime_error, "invalid utf8");
EXPECT_EQ(L"123456", fmt::detail::utf8_to_utf16("123456").str());
}
TEST(util_test, utf8_to_utf16_empty_string) {
auto s = std::string();
auto u = fmt::detail::utf8_to_utf16(s.c_str());
EXPECT_EQ(L"", u.str());
EXPECT_EQ(s.size(), u.size());
}
TEST(util_test, allocator_ref) {
using test_allocator_ref = allocator_ref<mock_allocator<int>>;
auto check_forwarding = [](mock_allocator<int>& alloc,
test_allocator_ref& ref) {
int mem;
// Check if value_type is properly defined.
allocator_ref<mock_allocator<int>>::value_type* ptr = &mem;
// Check forwarding.
EXPECT_CALL(alloc, allocate(42)).WillOnce(Return(ptr));
ref.allocate(42);
EXPECT_CALL(alloc, deallocate(ptr, 42));
ref.deallocate(ptr, 42);
};
StrictMock<mock_allocator<int>> alloc;
auto ref = test_allocator_ref(&alloc);
// Check if allocator_ref forwards to the underlying allocator.
check_forwarding(alloc, ref);
test_allocator_ref ref2(ref);
check_forwarding(alloc, ref2);
test_allocator_ref ref3;
EXPECT_EQ(nullptr, ref3.get());
ref3 = ref;
check_forwarding(alloc, ref3);
}
TEST(util_test, format_system_error) {
fmt::memory_buffer message;
fmt::format_system_error(message, EDOM, "test");
auto ec = std::error_code(EDOM, std::generic_category());
EXPECT_EQ(to_string(message), std::system_error(ec, "test").what());
message = fmt::memory_buffer();
// Check if std::allocator throws on allocating max size_t / 2 chars.
size_t max_size = max_value<size_t>() / 2;
bool throws_on_alloc = false;
try {
auto alloc = std::allocator<char>();
alloc.deallocate(alloc.allocate(max_size), max_size);
} catch (const std::bad_alloc&) {
throws_on_alloc = true;
}
if (!throws_on_alloc) {
fmt::print(stderr, "warning: std::allocator allocates {} chars\n",
max_size);
return;
}
}
TEST(util_test, system_error) {
auto test_error = fmt::system_error(EDOM, "test");
auto ec = std::error_code(EDOM, std::generic_category());
EXPECT_STREQ(test_error.what(), std::system_error(ec, "test").what());
EXPECT_EQ(test_error.code(), ec);
auto error = std::system_error(std::error_code());
try {
throw fmt::system_error(EDOM, "test {}", "error");
} catch (const std::system_error& e) {
error = e;
}
fmt::memory_buffer message;
fmt::format_system_error(message, EDOM, "test error");
EXPECT_EQ(error.what(), to_string(message));
EXPECT_EQ(error.code(), std::error_code(EDOM, std::generic_category()));
}
TEST(util_test, report_system_error) {
fmt::memory_buffer out;
fmt::format_system_error(out, EDOM, "test error");
out.push_back('\n');
EXPECT_WRITE(stderr, fmt::report_system_error(EDOM, "test error"),
to_string(out));
}
TEST(memory_buffer_test, ctor) {
basic_memory_buffer<char, 123> buffer;
EXPECT_EQ(static_cast<size_t>(0), buffer.size());
EXPECT_EQ(123u, buffer.capacity());
}
using std_allocator = allocator_ref<std::allocator<char>, true>;
TEST(memory_buffer_test, move_ctor_inline_buffer) {
auto check_move_buffer =
[](const char* str, basic_memory_buffer<char, 5, std_allocator>& buffer) {
std::allocator<char>* alloc = buffer.get_allocator().get();
basic_memory_buffer<char, 5, std_allocator> buffer2(std::move(buffer));
// Move shouldn't destroy the inline content of the first buffer.
EXPECT_EQ(str, std::string(&buffer[0], buffer.size()));
EXPECT_EQ(str, std::string(&buffer2[0], buffer2.size()));
EXPECT_EQ(5u, buffer2.capacity());
// Move should transfer allocator.
EXPECT_EQ(nullptr, buffer.get_allocator().get());
EXPECT_EQ(alloc, buffer2.get_allocator().get());
};
auto alloc = std::allocator<char>();
basic_memory_buffer<char, 5, std_allocator> buffer((std_allocator(&alloc)));
const char test[] = "test";
buffer.append(string_view(test, 4));
check_move_buffer("test", buffer);
// Adding one more character fills the inline buffer, but doesn't cause
// dynamic allocation.
buffer.push_back('a');
check_move_buffer("testa", buffer);
}
TEST(memory_buffer_test, move_ctor_dynamic_buffer) {
auto alloc = std::allocator<char>();
basic_memory_buffer<char, 4, std_allocator> buffer((std_allocator(&alloc)));
const char test[] = "test";
buffer.append(test, test + 4);
const char* inline_buffer_ptr = &buffer[0];
// Adding one more character causes the content to move from the inline to
// a dynamically allocated buffer.
buffer.push_back('a');
basic_memory_buffer<char, 4, std_allocator> buffer2(std::move(buffer));
// Move should rip the guts of the first buffer.
EXPECT_EQ(&buffer[0], inline_buffer_ptr);
EXPECT_EQ(buffer.size(), 0);
EXPECT_EQ(std::string(&buffer2[0], buffer2.size()), "testa");
EXPECT_GT(buffer2.capacity(), 4u);
}
using std_allocator_n = allocator_ref<std::allocator<char>, false>;
TEST(memory_buffer_test, move_ctor_inline_buffer_non_propagating) {
auto check_move_buffer =
[](const char* str,
basic_memory_buffer<char, 5, std_allocator_n>& buffer) {
std::allocator<char>* original_alloc_ptr = buffer.get_allocator().get();
const char* original_data_ptr = &buffer[0];
basic_memory_buffer<char, 5, std_allocator_n> buffer2(
std::move(buffer));
const char* new_data_ptr = &buffer2[0];
EXPECT_NE(original_data_ptr, new_data_ptr);
EXPECT_EQ(str, std::string(&buffer[0], buffer.size()));
EXPECT_EQ(str, std::string(&buffer2[0], buffer2.size()));
EXPECT_EQ(5u, buffer2.capacity());
// Allocators should NOT be transferred; they remain distinct instances.
// The original buffer's allocator pointer should still be valid (not
// nullptr).
EXPECT_EQ(original_alloc_ptr, buffer.get_allocator().get());
EXPECT_NE(original_alloc_ptr, buffer2.get_allocator().get());
};
auto alloc = std::allocator<char>();
basic_memory_buffer<char, 5, std_allocator_n> buffer(
(std_allocator_n(&alloc)));
const char test[] = "test";
buffer.append(string_view(test, 4));
check_move_buffer("test", buffer);
buffer.push_back('a');
check_move_buffer("testa", buffer);
}
TEST(memory_buffer_test, move_ctor_dynamic_buffer_non_propagating) {
auto alloc = std::allocator<char>();
basic_memory_buffer<char, 4, std_allocator_n> buffer(
(std_allocator_n(&alloc)));
const char test[] = "test";
buffer.append(test, test + 4);
const char* inline_buffer_ptr = &buffer[0];
buffer.push_back('a');
EXPECT_NE(&buffer[0], inline_buffer_ptr);
std::allocator<char>* original_alloc_ptr = buffer.get_allocator().get();
basic_memory_buffer<char, 4, std_allocator_n> buffer2;
buffer2 = std::move(buffer);
EXPECT_EQ(std::string(&buffer2[0], buffer2.size()), "testa");
EXPECT_GT(buffer2.capacity(), 4u);
EXPECT_NE(&buffer2[0], inline_buffer_ptr);
EXPECT_EQ(original_alloc_ptr, buffer.get_allocator().get());
EXPECT_NE(original_alloc_ptr, buffer2.get_allocator().get());
}
void check_move_assign_buffer(const char* str,
basic_memory_buffer<char, 5>& buffer) {
basic_memory_buffer<char, 5> buffer2;
buffer2 = std::move(buffer);
// Move shouldn't destroy the inline content of the first buffer.
EXPECT_EQ(str, std::string(&buffer[0], buffer.size()));
EXPECT_EQ(str, std::string(&buffer2[0], buffer2.size()));
EXPECT_EQ(5u, buffer2.capacity());
}
TEST(memory_buffer_test, move_assignment) {
basic_memory_buffer<char, 5> buffer;
const char test[] = "test";
buffer.append(test, test + 4);
check_move_assign_buffer("test", buffer);
// Adding one more character fills the inline buffer, but doesn't cause
// dynamic allocation.
buffer.push_back('a');
check_move_assign_buffer("testa", buffer);
const char* inline_buffer_ptr = &buffer[0];
// Adding one more character causes the content to move from the inline to
// a dynamically allocated buffer.
buffer.push_back('b');
basic_memory_buffer<char, 5> buffer2;
buffer2 = std::move(buffer);
// Move should rip the guts of the first buffer.
EXPECT_EQ(inline_buffer_ptr, &buffer[0]);
EXPECT_EQ("testab", std::string(&buffer2[0], buffer2.size()));
EXPECT_GT(buffer2.capacity(), 5u);
}
TEST(memory_buffer_test, grow) {
using allocator = allocator_ref<mock_allocator<int>>;
mock_allocator<int> alloc;
basic_memory_buffer<int, 10, allocator> buffer((allocator(&alloc)));
buffer.resize(7);
using fmt::detail::to_unsigned;
for (int i = 0; i < 7; ++i) buffer[to_unsigned(i)] = i * i;
EXPECT_EQ(10u, buffer.capacity());
int mem[20];
mem[7] = 0xdead;
EXPECT_CALL(alloc, allocate(20)).WillOnce(Return(mem));
buffer.try_reserve(20);
EXPECT_EQ(20u, buffer.capacity());
// Check if size elements have been copied
for (int i = 0; i < 7; ++i) EXPECT_EQ(i * i, buffer[to_unsigned(i)]);
// and no more than that.
EXPECT_EQ(0xdead, buffer[7]);
EXPECT_CALL(alloc, deallocate(mem, 20));
}
TEST(memory_buffer_test, allocator) {
using test_allocator = allocator_ref<mock_allocator<char>>;
basic_memory_buffer<char, 10, test_allocator> buffer;
EXPECT_EQ(nullptr, buffer.get_allocator().get());
StrictMock<mock_allocator<char>> alloc;
char mem;
{
basic_memory_buffer<char, 10, test_allocator> buffer2(
(test_allocator(&alloc)));
EXPECT_EQ(&alloc, buffer2.get_allocator().get());
size_t size = 2 * fmt::inline_buffer_size;
EXPECT_CALL(alloc, allocate(size)).WillOnce(Return(&mem));
buffer2.reserve(size);
EXPECT_CALL(alloc, deallocate(&mem, size));
}
}
TEST(memory_buffer_test, exception_in_deallocate) {
using test_allocator = allocator_ref<mock_allocator<char>>;
StrictMock<mock_allocator<char>> alloc;
basic_memory_buffer<char, 10, test_allocator> buffer(
(test_allocator(&alloc)));
size_t size = 2 * fmt::inline_buffer_size;
auto mem = std::vector<char>(size);
{
EXPECT_CALL(alloc, allocate(size)).WillOnce(Return(&mem[0]));
buffer.resize(size);
std::fill(&buffer[0], &buffer[0] + size, 'x');
}
auto mem2 = std::vector<char>(2 * size);
{
EXPECT_CALL(alloc, allocate(2 * size)).WillOnce(Return(&mem2[0]));
auto e = std::exception();
EXPECT_CALL(alloc, deallocate(&mem[0], size)).WillOnce(testing::Throw(e));
EXPECT_THROW(buffer.reserve(2 * size), std::exception);
EXPECT_EQ(&mem2[0], &buffer[0]);
// Check that the data has been copied.
for (size_t i = 0; i < size; ++i) EXPECT_EQ('x', buffer[i]);
}
EXPECT_CALL(alloc, deallocate(&mem2[0], 2 * size));
}
template <typename Allocator, size_t MaxSize>
class max_size_allocator : public Allocator {
public:
using typename Allocator::value_type;
size_t max_size() const noexcept { return MaxSize; }
value_type* allocate(size_t n) {
if (n > max_size()) {
throw std::length_error("size > max_size");
}
return std::allocator_traits<Allocator>::allocate(
*static_cast<Allocator*>(this), n);
}
void deallocate(value_type* p, size_t n) {
std::allocator_traits<Allocator>::deallocate(*static_cast<Allocator*>(this),
p, n);
}
};
TEST(memory_buffer_test, max_size_allocator) {
// 160 = 128 + 32
using test_allocator = max_size_allocator<std::allocator<char>, 160>;
basic_memory_buffer<char, 10, test_allocator> buffer;
buffer.resize(128);
// new_capacity = 128 + 128/2 = 192 > 160
buffer.resize(160); // Shouldn't throw.
}
TEST(memory_buffer_test, max_size_allocator_overflow) {
using test_allocator = max_size_allocator<std::allocator<char>, 160>;
basic_memory_buffer<char, 10, test_allocator> buffer;
EXPECT_THROW(buffer.resize(161), std::exception);
}
TEST(memory_buffer_test, back_insert_iterator) {
fmt::memory_buffer buf;
using iterator = decltype(std::back_inserter(buf));
EXPECT_TRUE(fmt::detail::is_back_insert_iterator<iterator>::value);
}
TEST(format_test, digits2_alignment) {
auto p =
fmt::detail::bit_cast<fmt::detail::uintptr_t>(fmt::detail::digits2(0));
EXPECT_EQ(p % 2, 0);
}
TEST(format_test, exception_from_lib) {
EXPECT_THROW_MSG(fmt::report_error("test"), format_error, "test");
}
TEST(format_test, escape) {
EXPECT_EQ(fmt::format("{{"), "{");
EXPECT_EQ(fmt::format("before {{"), "before {");
EXPECT_EQ(fmt::format("{{ after"), "{ after");
EXPECT_EQ(fmt::format("before {{ after"), "before { after");
EXPECT_EQ(fmt::format("}}"), "}");
EXPECT_EQ(fmt::format("before }}"), "before }");
EXPECT_EQ(fmt::format("}} after"), "} after");
EXPECT_EQ(fmt::format("before }} after"), "before } after");
EXPECT_EQ(fmt::format("{{}}"), "{}");
EXPECT_EQ(fmt::format("{{{0}}}", 42), "{42}");
}
TEST(format_test, unmatched_braces) {
EXPECT_THROW_MSG((void)fmt::format(runtime("{")), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("}")), format_error,
"unmatched '}' in format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0{}")), format_error,
"invalid format string");
}
TEST(format_test, no_args) { EXPECT_EQ(fmt::format("test"), "test"); }
TEST(format_test, args_in_different_positions) {
EXPECT_EQ(fmt::format("{0}", 42), "42");
EXPECT_EQ(fmt::format("before {0}", 42), "before 42");
EXPECT_EQ(fmt::format("{0} after", 42), "42 after");
EXPECT_EQ(fmt::format("before {0} after", 42), "before 42 after");
EXPECT_EQ(fmt::format("{0} = {1}", "answer", 42), "answer = 42");
EXPECT_EQ(fmt::format("{1} is the {0}", "answer", 42), "42 is the answer");
EXPECT_EQ(fmt::format("{0}{1}{0}", "abra", "cad"), "abracadabra");
}
TEST(format_test, arg_errors) {
EXPECT_THROW_MSG((void)fmt::format(runtime("{")), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{?}")), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0")), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0}")), format_error,
"argument not found");
EXPECT_THROW_MSG((void)fmt::format(runtime("{00}"), 42), format_error,
"invalid format string");
auto int_max = std::to_string(INT_MAX);
EXPECT_THROW_MSG((void)fmt::format(runtime("{" + int_max)), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{" + int_max + "}")),
format_error, "argument not found");
auto int_maxer = std::to_string(INT_MAX + 1u);
EXPECT_THROW_MSG((void)fmt::format(runtime("{" + int_maxer)), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{" + int_maxer + "}")),
format_error, "argument not found");
}
TEST(format_test, display_width_precision) {
EXPECT_EQ(fmt::format("{:.5}", "🐱🐱🐱"), "🐱🐱");
}
template <int N> struct test_format {
template <typename... T>
static auto format(fmt::string_view fmt, const T&... args) -> std::string {
return test_format<N - 1>::format(fmt, N - 1, args...);
}
};
template <> struct test_format<0> {
template <typename... T>
static auto format(fmt::string_view fmt, const T&... args) -> std::string {
return fmt::format(runtime(fmt), args...);
}
};
TEST(format_test, many_args) {
EXPECT_EQ("19", test_format<20>::format("{19}"));
EXPECT_THROW_MSG(test_format<20>::format("{20}"), format_error,
"argument not found");
EXPECT_THROW_MSG(test_format<21>::format("{21}"), format_error,
"argument not found");
using fmt::detail::max_packed_args;
std::string format_str = fmt::format("{{{}}}", max_packed_args + 1);
EXPECT_THROW_MSG(test_format<max_packed_args>::format(format_str),
format_error, "argument not found");
}
TEST(format_test, named_arg) {
EXPECT_EQ("1/a/A", fmt::format("{_1}/{a_}/{A_}", fmt::arg("a_", 'a'),
fmt::arg("A_", "A"), fmt::arg("_1", 1)));
EXPECT_EQ(fmt::format("{0:{width}}", -42, fmt::arg("width", 4)), " -42");
EXPECT_EQ(fmt::format("{value:{width}}", fmt::arg("value", -42),
fmt::arg("width", 4)),
" -42");
EXPECT_EQ("st",
fmt::format("{0:.{precision}}", "str", fmt::arg("precision", 2)));
EXPECT_EQ(fmt::format("{} {two}", 1, fmt::arg("two", 2)), "1 2");
EXPECT_EQ("42",
fmt::format("{c}", fmt::arg("a", 0), fmt::arg("b", 0),
fmt::arg("c", 42), fmt::arg("d", 0), fmt::arg("e", 0),
fmt::arg("f", 0), fmt::arg("g", 0), fmt::arg("h", 0),
fmt::arg("i", 0), fmt::arg("j", 0), fmt::arg("k", 0),
fmt::arg("l", 0), fmt::arg("m", 0), fmt::arg("n", 0),
fmt::arg("o", 0), fmt::arg("p", 0)));
EXPECT_THROW_MSG((void)fmt::format(runtime("{a}")), format_error,
"argument not found");
EXPECT_THROW_MSG((void)fmt::format(runtime("{a}"), 42), format_error,
"argument not found");
EXPECT_THROW_MSG((void)fmt::format(runtime("{a} {}"), fmt::arg("a", 2), 42),
format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG(
(void)fmt::format("{a}", fmt::arg("a", 1), fmt::arg("a", 10)),
format_error, "duplicate named arg");
}
TEST(format_test, auto_arg_index) {
EXPECT_EQ(fmt::format("{}{}{}", 'a', 'b', 'c'), "abc");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0}{}"), 'a', 'b'), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG((void)fmt::format(runtime("{}{0}"), 'a', 'b'), format_error,
"cannot switch from automatic to manual argument indexing");
EXPECT_EQ(fmt::format("{:.{}}", 1.2345, 2), "1.2");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0}:.{}"), 1.2345, 2),
format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG((void)fmt::format(runtime("{:.{0}}"), 1.2345, 2),
format_error,
"cannot switch from automatic to manual argument indexing");
EXPECT_THROW_MSG((void)fmt::format(runtime("{}")), format_error,
"argument not found");
}
TEST(format_test, empty_specs) { EXPECT_EQ(fmt::format("{0:}", 42), "42"); }
TEST(format_test, left_align) {
EXPECT_EQ(fmt::format("{0:<4}", 42), "42 ");
EXPECT_EQ(fmt::format("{0:<4o}", 042), "42 ");
EXPECT_EQ(fmt::format("{0:<4x}", 0x42), "42 ");
EXPECT_EQ(fmt::format("{0:<5}", -42), "-42 ");
EXPECT_EQ(fmt::format("{0:<5}", 42u), "42 ");
EXPECT_EQ(fmt::format("{0:<5}", -42l), "-42 ");
EXPECT_EQ(fmt::format("{0:<5}", 42ul), "42 ");
EXPECT_EQ(fmt::format("{0:<5}", -42ll), "-42 ");
EXPECT_EQ(fmt::format("{0:<5}", 42ull), "42 ");
EXPECT_EQ(fmt::format("{0:<5}", -42.0), "-42 ");
EXPECT_EQ(fmt::format("{0:<5}", -42.0l), "-42 ");
EXPECT_EQ(fmt::format("{0:<5}", 'c'), "c ");
EXPECT_EQ(fmt::format("{0:<5}", "abc"), "abc ");
EXPECT_EQ(fmt::format("{0:<8}", reinterpret_cast<void*>(0xface)), "0xface ");
}
TEST(format_test, right_align) {
EXPECT_EQ(fmt::format("{0:>4}", 42), " 42");
EXPECT_EQ(fmt::format("{0:>4o}", 042), " 42");
EXPECT_EQ(fmt::format("{0:>4x}", 0x42), " 42");
EXPECT_EQ(fmt::format("{0:>5}", -42), " -42");
EXPECT_EQ(fmt::format("{0:>5}", 42u), " 42");
EXPECT_EQ(fmt::format("{0:>5}", -42l), " -42");
EXPECT_EQ(fmt::format("{0:>5}", 42ul), " 42");
EXPECT_EQ(fmt::format("{0:>5}", -42ll), " -42");
EXPECT_EQ(fmt::format("{0:>5}", 42ull), " 42");
EXPECT_EQ(fmt::format("{0:>5}", -42.0), " -42");
EXPECT_EQ(fmt::format("{0:>5}", -42.0l), " -42");
EXPECT_EQ(fmt::format("{0:>5}", 'c'), " c");
EXPECT_EQ(fmt::format("{0:>5}", "abc"), " abc");
EXPECT_EQ(fmt::format("{0:>8}", reinterpret_cast<void*>(0xface)), " 0xface");
}
TEST(format_test, center_align) {
EXPECT_EQ(fmt::format("{0:^5}", 42), " 42 ");
EXPECT_EQ(fmt::format("{0:^5o}", 042), " 42 ");
EXPECT_EQ(fmt::format("{0:^5x}", 0x42), " 42 ");
EXPECT_EQ(fmt::format("{0:^5}", -42), " -42 ");
EXPECT_EQ(fmt::format("{0:^5}", 42u), " 42 ");
EXPECT_EQ(fmt::format("{0:^5}", -42l), " -42 ");
EXPECT_EQ(fmt::format("{0:^5}", 42ul), " 42 ");
EXPECT_EQ(fmt::format("{0:^5}", -42ll), " -42 ");
EXPECT_EQ(fmt::format("{0:^5}", 42ull), " 42 ");
EXPECT_EQ(fmt::format("{0:^5}", -42.0), " -42 ");
EXPECT_EQ(fmt::format("{0:^5}", -42.0l), " -42 ");
EXPECT_EQ(fmt::format("{0:^5}", 'c'), " c ");
EXPECT_EQ(fmt::format("{0:^6}", "abc"), " abc ");
EXPECT_EQ(fmt::format("{0:^8}", reinterpret_cast<void*>(0xface)), " 0xface ");
}
TEST(format_test, fill) {
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{<5}"), 'c'), format_error,
"invalid fill character '{'");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{<5}}"), 'c'), format_error,
"invalid fill character '{'");
EXPECT_EQ(fmt::format("{0:*>4}", 42), "**42");
EXPECT_EQ(fmt::format("{0:*>5}", -42), "**-42");
EXPECT_EQ(fmt::format("{0:*>5}", 42u), "***42");
EXPECT_EQ(fmt::format("{0:*>5}", -42l), "**-42");
EXPECT_EQ(fmt::format("{0:*>5}", 42ul), "***42");
EXPECT_EQ(fmt::format("{0:*>5}", -42ll), "**-42");
EXPECT_EQ(fmt::format("{0:*>5}", 42ull), "***42");
EXPECT_EQ(fmt::format("{0:*>5}", -42.0), "**-42");
EXPECT_EQ(fmt::format("{0:*>5}", -42.0l), "**-42");
EXPECT_EQ(fmt::format("{0:*<5}", 'c'), "c****");
EXPECT_EQ(fmt::format("{0:*<5}", "abc"), "abc**");
EXPECT_EQ("**0xface",
fmt::format("{0:*>8}", reinterpret_cast<void*>(0xface)));
EXPECT_EQ(fmt::format("{:}=", "foo"), "foo=");
EXPECT_EQ(std::string("\0\0\0*", 4),
fmt::format(string_view("{:\0>4}", 6), '*'));
EXPECT_EQ(fmt::format("{0:ж>4}", 42), "жж42");
EXPECT_THROW_MSG((void)fmt::format(runtime("{:\x80\x80\x80\x80\x80>}"), 0),
format_error, "invalid format specifier");
}
TEST(format_test, plus_sign) {
EXPECT_EQ(fmt::format("{0:+}", 42), "+42");
EXPECT_EQ(fmt::format("{0:+}", -42), "-42");
EXPECT_EQ(fmt::format("{0:+}", 42), "+42");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+}"), 42u), format_error,
"invalid format specifier");
EXPECT_EQ(fmt::format("{0:+}", 42l), "+42");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+}"), 42ul), format_error,
"invalid format specifier");
EXPECT_EQ(fmt::format("{0:+}", 42ll), "+42");
#if FMT_USE_INT128
EXPECT_EQ(fmt::format("{0:+}", __int128_t(42)), "+42");
#endif
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+}"), 42ull), format_error,
"invalid format specifier");
EXPECT_EQ(fmt::format("{0:+}", 42.0), "+42");
EXPECT_EQ(fmt::format("{0:+}", 42.0l), "+42");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+}"), 'c'), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:+}"), "abc"), format_error,
"invalid format specifier");
EXPECT_THROW_MSG(
(void)fmt::format(runtime("{0:+}"), reinterpret_cast<void*>(0x42)),
format_error, "invalid format specifier");
}
TEST(format_test, minus_sign) {
EXPECT_EQ(fmt::format("{0:-}", 42), "42");
EXPECT_EQ(fmt::format("{0:-}", -42), "-42");
EXPECT_EQ(fmt::format("{0:-}", 42), "42");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-}"), 42u), format_error,
"invalid format specifier");
EXPECT_EQ(fmt::format("{0:-}", 42l), "42");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-}"), 42ul), format_error,
"invalid format specifier");
EXPECT_EQ(fmt::format("{0:-}", 42ll), "42");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-}"), 42ull), format_error,
"invalid format specifier");
EXPECT_EQ(fmt::format("{0:-}", 42.0), "42");
EXPECT_EQ(fmt::format("{0:-}", 42.0l), "42");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-}"), 'c'), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:-}"), "abc"), format_error,
"invalid format specifier");
EXPECT_THROW_MSG(
(void)fmt::format(runtime("{0:-}"), reinterpret_cast<void*>(0x42)),
format_error, "invalid format specifier");
}
TEST(format_test, space_sign) {
EXPECT_EQ(fmt::format("{0: }", 42), " 42");
EXPECT_EQ(fmt::format("{0: }", -42), "-42");
EXPECT_EQ(fmt::format("{0: }", 42), " 42");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0: }"), 42u), format_error,
"invalid format specifier");
EXPECT_EQ(fmt::format("{0: }", 42l), " 42");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0: }"), 42ul), format_error,
"invalid format specifier");
EXPECT_EQ(fmt::format("{0: }", 42ll), " 42");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0: }"), 42ull), format_error,
"invalid format specifier");
EXPECT_EQ(fmt::format("{0: }", 42.0), " 42");
EXPECT_EQ(fmt::format("{0: }", 42.0l), " 42");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0: }"), 'c'), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0: }"), "abc"), format_error,
"invalid format specifier");
EXPECT_THROW_MSG(
(void)fmt::format(runtime("{0: }"), reinterpret_cast<void*>(0x42)),
format_error, "invalid format specifier");
}
TEST(format_test, hash_flag) {
EXPECT_EQ(fmt::format("{0:#}", 42), "42");
EXPECT_EQ(fmt::format("{0:#}", -42), "-42");
EXPECT_EQ(fmt::format("{0:#b}", 42), "0b101010");
EXPECT_EQ(fmt::format("{0:#B}", 42), "0B101010");
EXPECT_EQ(fmt::format("{0:#b}", -42), "-0b101010");
EXPECT_EQ(fmt::format("{0:#x}", 0x42), "0x42");
EXPECT_EQ(fmt::format("{0:#X}", 0x42), "0X42");
EXPECT_EQ(fmt::format("{0:#x}", -0x42), "-0x42");
EXPECT_EQ(fmt::format("{0:#o}", 0), "0");
EXPECT_EQ(fmt::format("{0:#o}", 042), "042");
EXPECT_EQ(fmt::format("{0:#o}", -042), "-042");
EXPECT_EQ(fmt::format("{0:#}", 42u), "42");
EXPECT_EQ(fmt::format("{0:#x}", 0x42u), "0x42");
EXPECT_EQ(fmt::format("{0:#o}", 042u), "042");
EXPECT_EQ(fmt::format("{0:#}", -42l), "-42");
EXPECT_EQ(fmt::format("{0:#x}", 0x42l), "0x42");
EXPECT_EQ(fmt::format("{0:#x}", -0x42l), "-0x42");
EXPECT_EQ(fmt::format("{0:#o}", 042l), "042");
EXPECT_EQ(fmt::format("{0:#o}", -042l), "-042");
EXPECT_EQ(fmt::format("{0:#}", 42ul), "42");
EXPECT_EQ(fmt::format("{0:#x}", 0x42ul), "0x42");
EXPECT_EQ(fmt::format("{0:#o}", 042ul), "042");
EXPECT_EQ(fmt::format("{0:#}", -42ll), "-42");
EXPECT_EQ(fmt::format("{0:#x}", 0x42ll), "0x42");
EXPECT_EQ(fmt::format("{0:#x}", -0x42ll), "-0x42");
EXPECT_EQ(fmt::format("{0:#o}", 042ll), "042");
EXPECT_EQ(fmt::format("{0:#o}", -042ll), "-042");
EXPECT_EQ(fmt::format("{0:#}", 42ull), "42");
EXPECT_EQ(fmt::format("{0:#x}", 0x42ull), "0x42");
EXPECT_EQ(fmt::format("{0:#o}", 042ull), "042");
EXPECT_EQ(fmt::format("{0:#}", -42.0), "-42.");
EXPECT_EQ(fmt::format("{0:#}", -42.0l), "-42.");
EXPECT_EQ(fmt::format("{:#.0e}", 42.0), "4.e+01");
EXPECT_EQ(fmt::format("{:#.0f}", 0.01), "0.");
EXPECT_EQ(fmt::format("{:#.2g}", 0.5), "0.50");
EXPECT_EQ(fmt::format("{:#.0f}", 0.5), "0.");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:#"), 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:#}"), 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:#}"), "abc"), format_error,
"invalid format specifier");
EXPECT_THROW_MSG(
(void)fmt::format(runtime("{0:#}"), reinterpret_cast<void*>(0x42)),
format_error, "invalid format specifier");
}
TEST(format_test, zero_flag) {
EXPECT_EQ(fmt::format("{0:0}", 42), "42");
EXPECT_EQ(fmt::format("{0:05}", -42), "-0042");
EXPECT_EQ(fmt::format("{0:05}", 42u), "00042");
EXPECT_EQ(fmt::format("{0:05}", -42l), "-0042");
EXPECT_EQ(fmt::format("{0:05}", 42ul), "00042");
EXPECT_EQ(fmt::format("{0:05}", -42ll), "-0042");
EXPECT_EQ(fmt::format("{0:05}", 42ull), "00042");
EXPECT_EQ(fmt::format("{0:07}", -42.0), "-000042");
EXPECT_EQ(fmt::format("{0:07}", -42.0l), "-000042");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:0"), 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:05}"), 'c'), format_error,
"invalid format specifier for char");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:05}"), "abc"), format_error,
"format specifier requires numeric argument");
EXPECT_THROW_MSG(
(void)fmt::format(runtime("{0:05}"), reinterpret_cast<void*>(0x42)),
format_error, "format specifier requires numeric argument");
}
TEST(format_test, zero_flag_and_align) {
// If the 0 character and an align option both appear, the 0 character is
// ignored.
EXPECT_EQ(fmt::format("{:<05}", 42), "42 ");
EXPECT_EQ(fmt::format("{:<05}", -42), "-42 ");
EXPECT_EQ(fmt::format("{:^05}", 42), " 42 ");
EXPECT_EQ(fmt::format("{:^05}", -42), " -42 ");
EXPECT_EQ(fmt::format("{:>05}", 42), " 42");
EXPECT_EQ(fmt::format("{:>05}", -42), " -42");
}
TEST(format_test, width) {
auto int_maxer = std::to_string(INT_MAX + 1u);
EXPECT_THROW_MSG((void)fmt::format(runtime("{:" + int_maxer), 0),
format_error, "number is too big");
EXPECT_THROW_MSG((void)fmt::format(runtime("{:" + int_maxer + "}"), 0),
format_error, "number is too big");
EXPECT_EQ(fmt::format("{:4}", -42), " -42");
EXPECT_EQ(fmt::format("{:5}", 42u), " 42");
EXPECT_EQ(fmt::format("{:6}", -42l), " -42");
EXPECT_EQ(fmt::format("{:7}", 42ul), " 42");
EXPECT_EQ(fmt::format("{:6}", -42ll), " -42");
EXPECT_EQ(fmt::format("{:7}", 42ull), " 42");
EXPECT_EQ(fmt::format("{:8}", -1.23), " -1.23");
EXPECT_EQ(fmt::format("{:9}", -1.23l), " -1.23");
EXPECT_EQ(fmt::format("{:10}", reinterpret_cast<void*>(0xcafe)),
" 0xcafe");
EXPECT_EQ(fmt::format("{:11}", 'x'), "x ");
EXPECT_EQ(fmt::format("{:12}", "str"), "str ");
EXPECT_EQ(fmt::format("{:*^5}", "🤡"), "*🤡**");
EXPECT_EQ(fmt::format("{:*^6}", "🤡"), "**🤡**");
EXPECT_EQ(fmt::format("{:*^8}", "你好"), "**你好**");
EXPECT_EQ(fmt::format("{:#6}", 42.0), " 42.");
EXPECT_EQ(fmt::format("{:6c}", static_cast<int>('x')), "x ");
EXPECT_EQ(fmt::format("{:>06.0f}", 0.00884311), " 0");
}
TEST(format_test, debug_presentation) {
EXPECT_EQ(fmt::format("{:?}", ""), R"("")");
EXPECT_EQ(fmt::format("{:*<5.0?}", "\n"), R"(*****)");
EXPECT_EQ(fmt::format("{:*<5.1?}", "\n"), R"("****)");
EXPECT_EQ(fmt::format("{:*<5.2?}", "\n"), R"("\***)");
EXPECT_EQ(fmt::format("{:*<5.3?}", "\n"), R"("\n**)");
EXPECT_EQ(fmt::format("{:*<5.4?}", "\n"), R"("\n"*)");
EXPECT_EQ(fmt::format("{:*<5.1?}", "Σ"), R"("****)");
EXPECT_EQ(fmt::format("{:*<5.2?}", "Σ"), R"("Σ***)");
EXPECT_EQ(fmt::format("{:*<5.3?}", "Σ"), R"("Σ"**)");
EXPECT_EQ(fmt::format("{:*<5.1?}", "笑"), R"("****)");
EXPECT_EQ(fmt::format("{:*<5.2?}", "笑"), R"("****)");
EXPECT_EQ(fmt::format("{:*<5.3?}", "笑"), R"("笑**)");
EXPECT_EQ(fmt::format("{:*<5.4?}", "笑"), R"("笑"*)");
EXPECT_EQ(fmt::format("{:*<8?}", "туда"), R"("туда"**)");
EXPECT_EQ(fmt::format("{:*>8?}", "сюда"), R"(**"сюда")");
EXPECT_EQ(fmt::format("{:*^8?}", "中心"), R"(*"中心"*)");
EXPECT_EQ(fmt::format("{:*^14?}", "A\t👈🤯ы猫"), R"(*"A\t👈🤯ы猫"*)");
}
auto bad_dynamic_spec_msg = FMT_BUILTIN_TYPES
? "width/precision is out of range"
: "width/precision is not integer";
TEST(format_test, runtime_width) {
auto int_maxer = std::to_string(INT_MAX + 1u);
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{" + int_maxer), 0),
format_error, "invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{" + int_maxer + "}"), 0),
format_error, "argument not found");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{" + int_maxer + "}}"), 0),
format_error, "argument not found");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{"), 0), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{}"), 0), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{?}}"), 0), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0), format_error,
"argument not found");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{0:}}"), 0), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, -1), format_error,
"width/precision is out of range");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, (INT_MAX + 1u)),
format_error, bad_dynamic_spec_msg);
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, -1l), format_error,
bad_dynamic_spec_msg);
if (fmt::detail::const_check(sizeof(long) > sizeof(int))) {
long value = INT_MAX;
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, (value + 1)),
format_error, bad_dynamic_spec_msg);
}
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, (INT_MAX + 1ul)),
format_error, bad_dynamic_spec_msg);
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, '0'), format_error,
"width/precision is not integer");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:{1}}"), 0, 0.0), format_error,
"width/precision is not integer");
EXPECT_EQ(fmt::format("{0:{1}}", -42, 4), " -42");
EXPECT_EQ(fmt::format("{0:{1}}", 42u, 5), " 42");
EXPECT_EQ(fmt::format("{0:{1}}", -42l, 6), " -42");
EXPECT_EQ(fmt::format("{0:{1}}", 42ul, 7), " 42");
EXPECT_EQ(fmt::format("{0:{1}}", -42ll, 6), " -42");
EXPECT_EQ(fmt::format("{0:{1}}", 42ull, 7), " 42");
EXPECT_EQ(fmt::format("{0:{1}}", -1.23, 8), " -1.23");
EXPECT_EQ(fmt::format("{0:{1}}", -1.23l, 9), " -1.23");
EXPECT_EQ(" 0xcafe",
fmt::format("{0:{1}}", reinterpret_cast<void*>(0xcafe), 10));
EXPECT_EQ(fmt::format("{0:{1}}", 'x', 11), "x ");
EXPECT_EQ(fmt::format("{0:{1}}", "str", 12), "str ");
EXPECT_EQ(fmt::format("{:{}}", 42, short(4)), " 42");
}
TEST(format_test, exponent_range) {
for (int e = -1074; e <= 1023; ++e) (void)fmt::format("{}", std::ldexp(1, e));
}
TEST(format_test, precision) {
char format_str[buffer_size];
safe_sprintf(format_str, "{0:.%u", UINT_MAX);
increment(format_str + 4);
EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0.0), format_error,
"number is too big");
size_t size = std::strlen(format_str);
format_str[size] = '}';
format_str[size + 1] = 0;
EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0.0), format_error,
"number is too big");
safe_sprintf(format_str, "{0:.%u", INT_MAX + 1u);
EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0.0), format_error,
"number is too big");
safe_sprintf(format_str, "{0:.%u}", INT_MAX + 1u);
EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0.0), format_error,
"number is too big");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:."), 0.0), format_error,
"invalid precision");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.}"), 0.0), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2"), 0), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2}"), 42), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2f}"), 42), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2}"), 42u), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2f}"), 42u), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2}"), 42l), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2f}"), 42l), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2}"), 42ul), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2f}"), 42ul), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2}"), 42ll), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2f}"), 42ll), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2}"), 42ull), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2f}"), 42ull), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:3.0}"), 'x'), format_error,
"invalid format specifier");
EXPECT_EQ(fmt::format("{0:.2}", 1.2345), "1.2");
EXPECT_EQ(fmt::format("{0:.2}", 1.2345l), "1.2");
EXPECT_EQ(fmt::format("{:.2}", 1.234e56), "1.2e+56");
EXPECT_EQ(fmt::format("{0:.3}", 1.1), "1.1");
EXPECT_EQ(fmt::format("{:.0e}", 1.0L), "1e+00");
EXPECT_EQ(fmt::format("{:9.1e}", 0.0), " 0.0e+00");
EXPECT_EQ(fmt::format("{:.7f}", 0.0000000000000071054273576010018587L),
"0.0000000");
EXPECT_EQ(
fmt::format("{:.494}", 4.9406564584124654E-324),
"4.9406564584124654417656879286822137236505980261432476442558568250067550"
"727020875186529983636163599237979656469544571773092665671035593979639877"
"479601078187812630071319031140452784581716784898210368871863605699873072"
"305000638740915356498438731247339727316961514003171538539807412623856559"
"117102665855668676818703956031062493194527159149245532930545654440112748"
"012970999954193198940908041656332452475714786901472678015935523861155013"
"480352649347201937902681071074917033322268447533357208324319361e-324");
EXPECT_EQ(
fmt::format("{:.1074f}", 1.1125369292536e-308),
"0.0000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000111253692925360019747947051741965785554081512200979"
"355021686109411883779182127659725163430929750364498219730822952552570601"
"152163505899912777129583674906301179059298598412303893909188340988729019"
"014361467448914817838555156840459458527907308695109202499990850735085304"
"478476991912072201449236975063640913461919914396877093174125167509869762"
"482369631100360266123742648159508919592746619553246586039571522788247697"
"156360766271842991667238355464496455107749716934387136380536472531224398"
"559833794807213172371254492216255558078524900147957309382830827524104234"
"530961756787819847850302379672357738807808384667004752163416921762619527"
"462847642037420991432005657440259928195996762610375541867198059294212446"
"81962777939941034720757232455434770912461317493580281734466552734375");
std::string outputs[] = {
"-0X1.41FE3FFE71C9E000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000P+127",
"-0XA.0FF1FFF38E4F0000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000000000000000000000000"
"000000000000000000000000000000000000000000000000000P+124"};
EXPECT_THAT(outputs,
testing::Contains(fmt::format("{:.838A}", -2.14001164E+38)));
if (std::numeric_limits<long double>::digits == 64) {
auto ld = (std::numeric_limits<long double>::min)();
EXPECT_EQ(fmt::format("{:.0}", ld), "3e-4932");
EXPECT_EQ(
fmt::format("{:0g}", std::numeric_limits<long double>::denorm_min()),
"3.6452e-4951");
}
EXPECT_EQ(fmt::format("{:#.0f}", 123.0), "123.");
EXPECT_EQ(fmt::format("{:.02f}", 1.234), "1.23");
EXPECT_EQ(fmt::format("{:.1g}", 0.001), "0.001");
EXPECT_EQ(fmt::format("{}", 123456789.0f), "1.2345679e+08");
EXPECT_EQ(fmt::format("{}", 1019666432.0f), "1.0196664e+09");
EXPECT_EQ(fmt::format("{:.0e}", 9.5), "1e+01");
EXPECT_EQ(fmt::format("{:.1e}", 1e-34), "1.0e-34");
EXPECT_THROW_MSG(
(void)fmt::format(runtime("{0:.2}"), reinterpret_cast<void*>(0xcafe)),
format_error, "invalid format specifier");
EXPECT_THROW_MSG(
(void)fmt::format(runtime("{0:.2f}"), reinterpret_cast<void*>(0xcafe)),
format_error, "invalid format specifier");
EXPECT_THROW_MSG(
(void)fmt::format("{:.2147483646f}", -2.2121295195081227E+304),
format_error, "number is too big");
EXPECT_THROW_MSG((void)fmt::format(runtime("{:.f}"), 42.0), format_error,
"invalid format string");
EXPECT_EQ(fmt::format("{0:.2}", "str"), "st");
EXPECT_EQ(fmt::format("{0:.5}", "вожыкі"), "вожык");
EXPECT_EQ(fmt::format("{0:.6}", "123456\xad"), "123456");
}
TEST(format_test, large_precision) {
// Iterator used to abort the actual output.
struct throwing_iterator {
auto operator=(char) -> throwing_iterator& {
throw std::runtime_error("aborted");
return *this;
}
auto operator*() -> throwing_iterator& { return *this; }
auto operator++() -> throwing_iterator& { return *this; }
auto operator++(int) -> throwing_iterator { return *this; }
};
auto it = throwing_iterator();
EXPECT_THROW_MSG(fmt::format_to(it, fmt::runtime("{:#.{}}"), 1.0,
fmt::detail::max_value<int>()),
std::runtime_error, "aborted");
EXPECT_THROW_MSG(fmt::format_to(it, fmt::runtime("{:#.{}e}"), 1.0,
fmt::detail::max_value<int>() - 1),
std::runtime_error, "aborted");
EXPECT_THROW_MSG((void)fmt::format(fmt::runtime("{:.{}e}"), 42.0,
fmt::detail::max_value<int>()),
format_error, "number is too big");
}
TEST(format_test, utf8_precision) {
auto result = fmt::format("{:.4}", "caf\u00e9s"); // cafés
EXPECT_EQ(result, "caf\u00e9");
}
TEST(format_test, runtime_precision) {
char format_str[buffer_size];
safe_sprintf(format_str, "{0:.{%u", UINT_MAX);
increment(format_str + 5);
EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0.0), format_error,
"invalid format string");
size_t size = std::strlen(format_str);
format_str[size] = '}';
format_str[size + 1] = 0;
EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0.0), format_error,
"argument not found");
format_str[size + 1] = '}';
format_str[size + 2] = 0;
EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), 0.0), format_error,
"argument not found");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{"), 0.0), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{}"), 0.0), format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{?}}"), 0.0), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}"), 0, 0), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0.0), format_error,
"argument not found");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{0:}}"), 0.0), format_error,
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0.0, -1),
format_error, "width/precision is out of range");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0.0, (INT_MAX + 1u)),
format_error, bad_dynamic_spec_msg);
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0.0, -1l),
format_error, bad_dynamic_spec_msg);
if (fmt::detail::const_check(sizeof(long) > sizeof(int))) {
long value = INT_MAX;
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0.0, (value + 1)),
format_error, bad_dynamic_spec_msg);
}
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0.0, (INT_MAX + 1ul)),
format_error, bad_dynamic_spec_msg);
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0.0, '0'),
format_error, "width/precision is not integer");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 0.0, 0.0),
format_error, "width/precision is not integer");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 42, 2), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"), 42, 2), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 42u, 2), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"), 42u, 2),
format_error, "invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 42l, 2), format_error,
"invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"), 42l, 2),
format_error, "invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 42ul, 2),
format_error, "invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"), 42ul, 2),
format_error, "invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 42ll, 2),
format_error, "invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"), 42ll, 2),
format_error, "invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"), 42ull, 2),
format_error, "invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"), 42ull, 2),
format_error, "invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:3.{1}}"), 'x', 0),
format_error, "invalid format specifier");
EXPECT_EQ(fmt::format("{0:.{1}}", 1.2345, 2), "1.2");
EXPECT_EQ(fmt::format("{1:.{0}}", 2, 1.2345l), "1.2");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}}"),
reinterpret_cast<void*>(0xcafe), 2),
format_error, "invalid format specifier");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.{1}f}"),
reinterpret_cast<void*>(0xcafe), 2),
format_error, "invalid format specifier");
EXPECT_EQ(fmt::format("{0:.{1}}", "str", 2), "st");
}
TEST(format_test, format_bool) {
EXPECT_EQ(fmt::format("{}", true), "true");
EXPECT_EQ(fmt::format("{}", false), "false");
EXPECT_EQ(fmt::format("{:d}", true), "1");
EXPECT_EQ(fmt::format("{:5}", true), "true ");
EXPECT_EQ(fmt::format("{:s}", true), "true");
EXPECT_EQ(fmt::format("{:s}", false), "false");
EXPECT_EQ(fmt::format("{:6s}", false), "false ");
EXPECT_THROW_MSG((void)fmt::format(runtime("{:c}"), false), format_error,
"invalid format specifier");
}
TEST(format_test, format_short) {
short s = 42;
EXPECT_EQ(fmt::format("{0:d}", s), "42");
unsigned short us = 42;
EXPECT_EQ(fmt::format("{0:d}", us), "42");
}
template <typename T>
void check_unknown_types(const T& value, const char* types, const char*) {
char format_str[buffer_size];
const char* special = ".0123456789L?}";
for (int i = CHAR_MIN; i <= CHAR_MAX; ++i) {
char c = static_cast<char>(i);
if (std::strchr(types, c) || std::strchr(special, c) || !c) continue;
safe_sprintf(format_str, "{0:10%c}", c);
const char* message = "invalid format specifier";
EXPECT_THROW_MSG((void)fmt::format(runtime(format_str), value),
format_error, message)
<< format_str << " " << message;
}
}
TEST(format_test, format_int) {
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:v"), 42), format_error,
"invalid format specifier");
check_unknown_types(42, "bBdoxXnLc", "integer");
EXPECT_EQ(fmt::format("{:c}", static_cast<int>('x')), "x");
}
TEST(format_test, format_bin) {
EXPECT_EQ(fmt::format("{0:b}", 0), "0");
EXPECT_EQ(fmt::format("{0:b}", 42), "101010");
EXPECT_EQ(fmt::format("{0:b}", 42u), "101010");
EXPECT_EQ(fmt::format("{0:b}", -42), "-101010");
EXPECT_EQ(fmt::format("{0:b}", 12345), "11000000111001");
EXPECT_EQ(fmt::format("{0:b}", 0x12345678), "10010001101000101011001111000");
EXPECT_EQ("10010000101010111100110111101111",
fmt::format("{0:b}", 0x90ABCDEF));
EXPECT_EQ("11111111111111111111111111111111",
fmt::format("{0:b}", max_value<uint32_t>()));
}
#if FMT_USE_INT128
constexpr auto int128_max = static_cast<__int128_t>(
(static_cast<__uint128_t>(1) << ((__SIZEOF_INT128__ * CHAR_BIT) - 1)) - 1);
constexpr auto int128_min = -int128_max - 1;
constexpr auto uint128_max = ~static_cast<__uint128_t>(0);
#endif
TEST(format_test, format_dec) {
EXPECT_EQ(fmt::format("{0}", 0), "0");
EXPECT_EQ(fmt::format("{0}", 42), "42");
EXPECT_EQ(fmt::format("{:}>", 42), "42>");
EXPECT_EQ(fmt::format("{0:d}", 42), "42");
EXPECT_EQ(fmt::format("{0}", 42u), "42");
EXPECT_EQ(fmt::format("{0}", -42), "-42");
EXPECT_EQ(fmt::format("{0}", 12345), "12345");
EXPECT_EQ(fmt::format("{0}", 67890), "67890");
#if FMT_USE_INT128
EXPECT_EQ(fmt::format("{0}", static_cast<__int128_t>(0)), "0");
EXPECT_EQ(fmt::format("{0}", static_cast<__uint128_t>(0)), "0");
EXPECT_EQ("9223372036854775808",
fmt::format("{0}", static_cast<__int128_t>(INT64_MAX) + 1));
EXPECT_EQ("-9223372036854775809",
fmt::format("{0}", static_cast<__int128_t>(INT64_MIN) - 1));
EXPECT_EQ("18446744073709551616",
fmt::format("{0}", static_cast<__int128_t>(UINT64_MAX) + 1));
EXPECT_EQ("170141183460469231731687303715884105727",
fmt::format("{0}", int128_max));
EXPECT_EQ("-170141183460469231731687303715884105728",
fmt::format("{0}", int128_min));
EXPECT_EQ("340282366920938463463374607431768211455",
fmt::format("{0}", uint128_max));
#endif
char buffer[buffer_size];
safe_sprintf(buffer, "%d", INT_MIN);
EXPECT_EQ(buffer, fmt::format("{0}", INT_MIN));
safe_sprintf(buffer, "%d", INT_MAX);
EXPECT_EQ(buffer, fmt::format("{0}", INT_MAX));
safe_sprintf(buffer, "%u", UINT_MAX);
EXPECT_EQ(buffer, fmt::format("{0}", UINT_MAX));
safe_sprintf(buffer, "%ld", 0 - static_cast<unsigned long>(LONG_MIN));
EXPECT_EQ(buffer, fmt::format("{0}", LONG_MIN));
safe_sprintf(buffer, "%ld", LONG_MAX);
EXPECT_EQ(buffer, fmt::format("{0}", LONG_MAX));
safe_sprintf(buffer, "%lu", ULONG_MAX);
EXPECT_EQ(buffer, fmt::format("{0}", ULONG_MAX));
}
TEST(format_test, format_hex) {
EXPECT_EQ(fmt::format("{0:x}", 0), "0");
EXPECT_EQ(fmt::format("{0:x}", 0x42), "42");
EXPECT_EQ(fmt::format("{0:x}", 0x42u), "42");
EXPECT_EQ(fmt::format("{0:x}", -0x42), "-42");
EXPECT_EQ(fmt::format("{0:x}", 0x12345678), "12345678");
EXPECT_EQ(fmt::format("{0:x}", 0x90abcdef), "90abcdef");
EXPECT_EQ(fmt::format("{0:X}", 0x12345678), "12345678");
EXPECT_EQ(fmt::format("{0:X}", 0x90ABCDEF), "90ABCDEF");
#if FMT_USE_INT128
EXPECT_EQ(fmt::format("{0:x}", static_cast<__int128_t>(0)), "0");
EXPECT_EQ(fmt::format("{0:x}", static_cast<__uint128_t>(0)), "0");
EXPECT_EQ("8000000000000000",
fmt::format("{0:x}", static_cast<__int128_t>(INT64_MAX) + 1));
EXPECT_EQ("-8000000000000001",
fmt::format("{0:x}", static_cast<__int128_t>(INT64_MIN) - 1));
EXPECT_EQ("10000000000000000",
fmt::format("{0:x}", static_cast<__int128_t>(UINT64_MAX) + 1));
EXPECT_EQ("7fffffffffffffffffffffffffffffff",
fmt::format("{0:x}", int128_max));
EXPECT_EQ("-80000000000000000000000000000000",
fmt::format("{0:x}", int128_min));
EXPECT_EQ("ffffffffffffffffffffffffffffffff",
fmt::format("{0:x}", uint128_max));
#endif
char buffer[buffer_size];
safe_sprintf(buffer, "-%x", 0 - static_cast<unsigned>(INT_MIN));
EXPECT_EQ(buffer, fmt::format("{0:x}", INT_MIN));
safe_sprintf(buffer, "%x", INT_MAX);
EXPECT_EQ(buffer, fmt::format("{0:x}", INT_MAX));
safe_sprintf(buffer, "%x", UINT_MAX);
EXPECT_EQ(buffer, fmt::format("{0:x}", UINT_MAX));
safe_sprintf(buffer, "-%lx", 0 - static_cast<unsigned long>(LONG_MIN));
EXPECT_EQ(buffer, fmt::format("{0:x}", LONG_MIN));
safe_sprintf(buffer, "%lx", LONG_MAX);
EXPECT_EQ(buffer, fmt::format("{0:x}", LONG_MAX));
safe_sprintf(buffer, "%lx", ULONG_MAX);
EXPECT_EQ(buffer, fmt::format("{0:x}", ULONG_MAX));
}
TEST(format_test, format_oct) {
EXPECT_EQ(fmt::format("{0:o}", 0), "0");
EXPECT_EQ(fmt::format("{0:o}", 042), "42");
EXPECT_EQ(fmt::format("{0:o}", 042u), "42");
EXPECT_EQ(fmt::format("{0:o}", -042), "-42");
EXPECT_EQ(fmt::format("{0:o}", 012345670), "12345670");
#if FMT_USE_INT128
EXPECT_EQ(fmt::format("{0:o}", static_cast<__int128_t>(0)), "0");
EXPECT_EQ(fmt::format("{0:o}", static_cast<__uint128_t>(0)), "0");
EXPECT_EQ("1000000000000000000000",
fmt::format("{0:o}", static_cast<__int128_t>(INT64_MAX) + 1));
EXPECT_EQ("-1000000000000000000001",
fmt::format("{0:o}", static_cast<__int128_t>(INT64_MIN) - 1));
EXPECT_EQ("2000000000000000000000",
fmt::format("{0:o}", static_cast<__int128_t>(UINT64_MAX) + 1));
EXPECT_EQ("1777777777777777777777777777777777777777777",
fmt::format("{0:o}", int128_max));
EXPECT_EQ("-2000000000000000000000000000000000000000000",
fmt::format("{0:o}", int128_min));
EXPECT_EQ("3777777777777777777777777777777777777777777",
fmt::format("{0:o}", uint128_max));
#endif
char buffer[buffer_size];
safe_sprintf(buffer, "-%o", 0 - static_cast<unsigned>(INT_MIN));
EXPECT_EQ(buffer, fmt::format("{0:o}", INT_MIN));
safe_sprintf(buffer, "%o", INT_MAX);
EXPECT_EQ(buffer, fmt::format("{0:o}", INT_MAX));
safe_sprintf(buffer, "%o", UINT_MAX);
EXPECT_EQ(buffer, fmt::format("{0:o}", UINT_MAX));
safe_sprintf(buffer, "-%lo", 0 - static_cast<unsigned long>(LONG_MIN));
EXPECT_EQ(buffer, fmt::format("{0:o}", LONG_MIN));
safe_sprintf(buffer, "%lo", LONG_MAX);
EXPECT_EQ(buffer, fmt::format("{0:o}", LONG_MAX));
safe_sprintf(buffer, "%lo", ULONG_MAX);
EXPECT_EQ(buffer, fmt::format("{0:o}", ULONG_MAX));
}
TEST(format_test, format_int_locale) {
EXPECT_EQ(fmt::format("{:L}", 1234), "1234");
}
TEST(format_test, format_float) {
EXPECT_EQ(fmt::format("{}", 0.0f), "0");
EXPECT_EQ(fmt::format("{0:f}", 392.5f), "392.500000");
}
TEST(format_test, format_double) {
EXPECT_EQ(fmt::format("{}", 0.0), "0");
check_unknown_types(1.2, "eEfFgGaAnL%", "double");
EXPECT_EQ(fmt::format("{:}", 0.0), "0");
EXPECT_EQ(fmt::format("{:f}", 0.0), "0.000000");
EXPECT_EQ(fmt::format("{:g}", 0.0), "0");
EXPECT_EQ(fmt::format("{:}", 392.65), "392.65");
EXPECT_EQ(fmt::format("{:g}", 392.65), "392.65");
EXPECT_EQ(fmt::format("{:G}", 392.65), "392.65");
EXPECT_EQ(fmt::format("{:g}", 4.9014e6), "4.9014e+06");
EXPECT_EQ(fmt::format("{:f}", 392.65), "392.650000");
EXPECT_EQ(fmt::format("{:F}", 392.65), "392.650000");
EXPECT_EQ(fmt::format("{:L}", 42.0), "42");
EXPECT_EQ(fmt::format("{:24a}", 4.2f), " 0x1.0cccccp+2");
EXPECT_EQ(fmt::format("{:24a}", 4.2), " 0x1.0cccccccccccdp+2");
EXPECT_EQ(fmt::format("{:<24a}", 4.2), "0x1.0cccccccccccdp+2 ");
EXPECT_EQ(fmt::format("{0:e}", 392.65), "3.926500e+02");
EXPECT_EQ(fmt::format("{0:E}", 392.65), "3.926500E+02");
EXPECT_EQ(fmt::format("{0:+010.4g}", 392.65), "+0000392.6");
#if FMT_CPLUSPLUS >= 201703L
double xd = 0x1.ffffffffffp+2;
EXPECT_EQ(fmt::format("{:.10a}", xd), "0x1.ffffffffffp+2");
EXPECT_EQ(fmt::format("{:.9a}", xd), "0x2.000000000p+2");
if (std::numeric_limits<long double>::digits == 64) {
auto ld = 0xf.ffffffffffp-3l;
EXPECT_EQ(fmt::format("{:a}", ld), "0xf.ffffffffffp-3");
EXPECT_EQ(fmt::format("{:.10a}", ld), "0xf.ffffffffffp-3");
EXPECT_EQ(fmt::format("{:.9a}", ld), "0x1.000000000p+1");
}
#endif
if (fmt::detail::const_check(std::numeric_limits<double>::is_iec559)) {
double d = (std::numeric_limits<double>::min)();
EXPECT_EQ(fmt::format("{:a}", d), "0x1p-1022");
EXPECT_EQ(fmt::format("{:#a}", d), "0x1.p-1022");
d = (std::numeric_limits<double>::max)();
EXPECT_EQ(fmt::format("{:a}", d), "0x1.fffffffffffffp+1023");
d = std::numeric_limits<double>::denorm_min();
EXPECT_EQ(fmt::format("{:a}", d), "0x0.0000000000001p-1022");
}
if (std::numeric_limits<long double>::digits == 64) {
auto ld = (std::numeric_limits<long double>::min)();
EXPECT_EQ(fmt::format("{:a}", ld), "0x8p-16385");
ld = (std::numeric_limits<long double>::max)();
EXPECT_EQ(fmt::format("{:a}", ld), "0xf.fffffffffffffffp+16380");
ld = std::numeric_limits<long double>::denorm_min();
EXPECT_EQ(fmt::format("{:a}", ld), "0x0.000000000000001p-16382");
}
EXPECT_EQ(fmt::format("{:.10a}", 4.2), "0x1.0ccccccccdp+2");
EXPECT_EQ(fmt::format("{:a}", -42.0), "-0x1.5p+5");
EXPECT_EQ(fmt::format("{:A}", -42.0), "-0X1.5P+5");
EXPECT_EQ(fmt::format("{:f}", 9223372036854775807.0),
"9223372036854775808.000000");
}
TEST(format_test, precision_rounding) {
EXPECT_EQ(fmt::format("{:.0f}", 0.0), "0");
EXPECT_EQ(fmt::format("{:.0f}", 0.01), "0");
EXPECT_EQ(fmt::format("{:.0f}", 0.1), "0");
EXPECT_EQ(fmt::format("{:.3f}", 0.00049), "0.000");
EXPECT_EQ(fmt::format("{:.3f}", 0.0005), "0.001");
EXPECT_EQ(fmt::format("{:.3f}", 0.00149), "0.001");
EXPECT_EQ(fmt::format("{:.3f}", 0.0015), "0.002");
EXPECT_EQ(fmt::format("{:.3f}", 0.9999), "1.000");
EXPECT_EQ(fmt::format("{:.3}", 0.00123), "0.00123");
EXPECT_EQ(fmt::format("{:.16g}", 0.1), "0.1");
EXPECT_EQ(fmt::format("{:.0}", 1.0), "1");
EXPECT_EQ("225.51575035152063720",
fmt::format("{:.17f}", 225.51575035152064));
EXPECT_EQ(fmt::format("{:.1f}", -761519619559038.2), "-761519619559038.2");
EXPECT_EQ("1.9156918820264798e-56",
fmt::format("{}", 1.9156918820264798e-56));
EXPECT_EQ(fmt::format("{:.4f}", 7.2809479766055470e-15), "0.0000");
}
TEST(format_test, prettify_float) {
EXPECT_EQ(fmt::format("{}", 1e-4), "0.0001");
EXPECT_EQ(fmt::format("{}", 1e-5), "1e-05");
EXPECT_EQ(fmt::format("{}", 1e15), "1000000000000000");
EXPECT_EQ(fmt::format("{}", 1e16), "1e+16");
EXPECT_EQ(fmt::format("{}", 9.999e-5), "9.999e-05");
EXPECT_EQ(fmt::format("{}", 1e10), "10000000000");
EXPECT_EQ(fmt::format("{}", 1e11), "100000000000");
EXPECT_EQ(fmt::format("{}", 1234e7), "12340000000");
EXPECT_EQ(fmt::format("{}", 1234e-2), "12.34");
EXPECT_EQ(fmt::format("{}", 1234e-6), "0.001234");
EXPECT_EQ(fmt::format("{}", 0.1f), "0.1");
EXPECT_EQ(fmt::format("{}", 1.35631564e-19f), "1.3563156e-19");
}
TEST(format_test, format_nan) {
double nan = std::numeric_limits<double>::quiet_NaN();
EXPECT_EQ(fmt::format("{}", nan), "nan");
EXPECT_EQ(fmt::format("{:+}", nan), "+nan");
EXPECT_EQ(fmt::format("{:+06}", nan), " +nan");
EXPECT_EQ(fmt::format("{:<+06}", nan), "+nan ");
EXPECT_EQ(fmt::format("{:^+06}", nan), " +nan ");
EXPECT_EQ(fmt::format("{:>+06}", nan), " +nan");
if (std::signbit(-nan)) {
EXPECT_EQ(fmt::format("{}", -nan), "-nan");
EXPECT_EQ(fmt::format("{:+06}", -nan), " -nan");
} else {
fmt::print("Warning: compiler doesn't handle negative NaN correctly");
}
EXPECT_EQ(fmt::format("{: }", nan), " nan");
EXPECT_EQ(fmt::format("{:F}", nan), "NAN");
EXPECT_EQ(fmt::format("{:<7}", nan), "nan ");
EXPECT_EQ(fmt::format("{:^7}", nan), " nan ");
EXPECT_EQ(fmt::format("{:>7}", nan), " nan");
}
TEST(format_test, format_infinity) {
double inf = std::numeric_limits<double>::infinity();
EXPECT_EQ(fmt::format("{}", inf), "inf");
EXPECT_EQ(fmt::format("{:+}", inf), "+inf");
EXPECT_EQ(fmt::format("{}", -inf), "-inf");
EXPECT_EQ(fmt::format("{:+06}", inf), " +inf");
EXPECT_EQ(fmt::format("{:+06}", -inf), " -inf");
EXPECT_EQ(fmt::format("{:<+06}", inf), "+inf ");
EXPECT_EQ(fmt::format("{:^+06}", inf), " +inf ");
EXPECT_EQ(fmt::format("{:>+06}", inf), " +inf");
EXPECT_EQ(fmt::format("{: }", inf), " inf");
EXPECT_EQ(fmt::format("{:F}", inf), "INF");
EXPECT_EQ(fmt::format("{:<7}", inf), "inf ");
EXPECT_EQ(fmt::format("{:^7}", inf), " inf ");
EXPECT_EQ(fmt::format("{:>7}", inf), " inf");
}
TEST(format_test, format_long_double) {
EXPECT_EQ(fmt::format("{0:}", 0.0l), "0");
EXPECT_EQ(fmt::format("{0:f}", 0.0l), "0.000000");
EXPECT_EQ(fmt::format("{:.1f}", 0.000000001l), "0.0");
EXPECT_EQ(fmt::format("{:.2f}", 0.099l), "0.10");
EXPECT_EQ(fmt::format("{0:}", 392.65l), "392.65");
EXPECT_EQ(fmt::format("{0:g}", 392.65l), "392.65");
EXPECT_EQ(fmt::format("{0:G}", 392.65l), "392.65");
EXPECT_EQ(fmt::format("{0:f}", 392.65l), "392.650000");
EXPECT_EQ(fmt::format("{0:F}", 392.65l), "392.650000");
char buffer[buffer_size];
safe_sprintf(buffer, "%Le", 392.65l);
EXPECT_EQ(buffer, fmt::format("{0:e}", 392.65l));
EXPECT_EQ(fmt::format("{0:+010.4g}", 392.64l), "+0000392.6");
auto ld = 3.31l;
if (fmt::detail::is_double_double<decltype(ld)>::value) {
safe_sprintf(buffer, "%a", static_cast<double>(ld));
EXPECT_EQ(buffer, fmt::format("{:a}", ld));
} else if (std::numeric_limits<long double>::digits == 64) {
EXPECT_EQ(fmt::format("{:a}", ld), "0xd.3d70a3d70a3d70ap-2");
}
}
TEST(format_test, format_char) {
const char types[] = "cbBdoxX";
check_unknown_types('a', types, "char");
EXPECT_EQ(fmt::format("{0}", 'a'), "a");
EXPECT_EQ(fmt::format("{0:c}", 'z'), "z");
int n = 'x';
for (const char* type = types + 1; *type; ++type) {
std::string format_str = fmt::format("{{:{}}}", *type);
EXPECT_EQ(fmt::format(runtime(format_str), n),
fmt::format(runtime(format_str), 'x'))
<< format_str;
}
EXPECT_EQ(fmt::format("{:02X}", n), fmt::format("{:02X}", 'x'));
EXPECT_EQ(fmt::format("{}", '\n'), "\n");
EXPECT_EQ(fmt::format("{:?}", '\n'), "'\\n'");
EXPECT_EQ(fmt::format("{:x}", '\xff'), "ff");
}
TEST(format_test, format_volatile_char) {
volatile char c = 'x';
EXPECT_EQ(fmt::format("{}", c), "x");
}
TEST(format_test, format_unsigned_char) {
EXPECT_EQ(fmt::format("{}", static_cast<unsigned char>(42)), "42");
EXPECT_EQ(fmt::format("{}", static_cast<uint8_t>(42)), "42");
}
TEST(format_test, format_cstring) {
check_unknown_types("test", "sp", "string");
EXPECT_EQ(fmt::format("{0}", "test"), "test");
EXPECT_EQ(fmt::format("{0:s}", "test"), "test");
char nonconst[] = "nonconst";
EXPECT_EQ(fmt::format("{0}", nonconst), "nonconst");
auto nullstr = static_cast<const char*>(nullptr);
EXPECT_THROW_MSG((void)fmt::format("{}", nullstr), format_error,
"string pointer is null");
EXPECT_THROW_MSG((void)fmt::format("{:s}", nullstr), format_error,
"string pointer is null");
}
void function_pointer_test(int, double, std::string) {}
TEST(format_test, format_pointer) {
check_unknown_types(reinterpret_cast<void*>(0x1234), "p", "pointer");
EXPECT_EQ(fmt::format("{0}", static_cast<void*>(nullptr)), "0x0");
EXPECT_EQ(fmt::format("{0}", reinterpret_cast<void*>(0x1234)), "0x1234");
EXPECT_EQ(fmt::format("{0:p}", reinterpret_cast<void*>(0x1234)), "0x1234");
// On CHERI (or other fat-pointer) systems, the size of a pointer is greater
// than the size an integer that can hold a virtual address. There is no
// portable address-as-an-integer type (yet) in C++, so we use `size_t` as
// the closest equivalent for now.
EXPECT_EQ("0x" + std::string(sizeof(size_t) * CHAR_BIT / 4, 'f'),
fmt::format("{0}", reinterpret_cast<void*>(~uintptr_t())));
EXPECT_EQ("0x1234",
fmt::format("{}", fmt::ptr(reinterpret_cast<int*>(0x1234))));
EXPECT_EQ(fmt::format("{}", fmt::detail::bit_cast<const void*>(
&function_pointer_test)),
fmt::format("{}", fmt::ptr(function_pointer_test)));
EXPECT_EQ(fmt::format("{}", nullptr), "0x0");
}
TEST(format_test, write_uintptr_fallback) {
// Test that formatting a pointer by converting it to uint128_fallback works.
// This is needed to support systems without uintptr_t.
auto s = std::string();
fmt::detail::write_ptr<char>(
std::back_inserter(s),
fmt::detail::bit_cast<fmt::detail::uint128_fallback>(
reinterpret_cast<void*>(0xface)),
nullptr);
EXPECT_EQ(s, "0xface");
}
enum class color { red, green, blue };
namespace test_ns {
enum class color { red, green, blue };
using fmt::enums::format_as;
} // namespace test_ns
TEST(format_test, format_enum_class) {
EXPECT_EQ(fmt::format("{}", fmt::underlying(color::red)), "0");
EXPECT_EQ(fmt::format("{}", test_ns::color::red), "0");
}
TEST(format_test, format_string) {
EXPECT_EQ(fmt::format("{0}", std::string("test")), "test");
EXPECT_EQ(fmt::format("{0}", std::string("test")), "test");
EXPECT_EQ(fmt::format("{:?}", std::string("test")), "\"test\"");
EXPECT_EQ(fmt::format("{:*^10?}", std::string("test")), "**\"test\"**");
EXPECT_EQ(fmt::format("{:?}", std::string("\test")), "\"\\test\"");
EXPECT_THROW((void)fmt::format(fmt::runtime("{:x}"), std::string("test")),
fmt::format_error);
}
TEST(format_test, format_string_view) {
EXPECT_EQ(fmt::format("{}", string_view("test")), "test");
EXPECT_EQ(fmt::format("{:?}", string_view("t\nst")), "\"t\\nst\"");
EXPECT_EQ(fmt::format("{}", string_view()), "");
}
#ifdef FMT_USE_STRING_VIEW
struct string_viewable {};
FMT_BEGIN_NAMESPACE
template <> struct formatter<string_viewable> : formatter<std::string_view> {
auto format(string_viewable, format_context& ctx) const
-> decltype(ctx.out()) {
return formatter<std::string_view>::format("foo", ctx);
}
};
FMT_END_NAMESPACE
TEST(format_test, format_std_string_view) {
EXPECT_EQ(fmt::format("{}", std::string_view("test")), "test");
EXPECT_EQ(fmt::format("{}", string_viewable()), "foo");
}
struct explicitly_convertible_to_std_string_view {
explicit operator std::string_view() const { return "foo"; }
};
template <>
struct fmt::formatter<explicitly_convertible_to_std_string_view>
: formatter<std::string_view> {
auto format(explicitly_convertible_to_std_string_view v,
format_context& ctx) const -> decltype(ctx.out()) {
return fmt::format_to(ctx.out(), "'{}'", std::string_view(v));
}
};
TEST(format_test, format_explicitly_convertible_to_std_string_view) {
EXPECT_EQ("'foo'",
fmt::format("{}", explicitly_convertible_to_std_string_view()));
}
struct convertible_to_std_string_view {
operator std::string_view() const noexcept { return "Hi there"; }
};
FMT_BEGIN_NAMESPACE
template <>
class formatter<convertible_to_std_string_view>
: public formatter<std::string_view> {};
FMT_END_NAMESPACE
TEST(format_test, format_implicitly_convertible_and_inherits_string_view) {
static_assert(fmt::is_formattable<convertible_to_std_string_view>{}, "");
EXPECT_EQ("Hi there", fmt::format("{}", convertible_to_std_string_view{}));
}
#endif
class Answer {};
FMT_BEGIN_NAMESPACE
template <> struct formatter<date> {
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
auto it = ctx.begin();
if (it != ctx.end() && *it == 'd') ++it;
return it;
}
auto format(const date& d, format_context& ctx) const -> decltype(ctx.out()) {
// Namespace-qualify to avoid ambiguity with std::format_to.
fmt::format_to(ctx.out(), "{}-{}-{}", d.year(), d.month(), d.day());
return ctx.out();
}
};
template <> struct formatter<Answer> : formatter<int> {
template <typename FormatContext>
auto format(Answer, FormatContext& ctx) const -> decltype(ctx.out()) {
return formatter<int>::format(42, ctx);
}
};
FMT_END_NAMESPACE
TEST(format_test, format_custom) {
EXPECT_THROW_MSG((void)fmt::format(runtime("{:s}"), date(2012, 12, 9)),
format_error, "unknown format specifier");
EXPECT_EQ(fmt::format("{0}", Answer()), "42");
EXPECT_EQ(fmt::format("{:04}", Answer()), "0042");
}
TEST(format_test, format_to_custom) {
char buf[10] = {};
auto end = fmt::format_to(buf, "{}", Answer());
EXPECT_EQ(end, buf + 2);
EXPECT_STREQ(buf, "42");
}
TEST(format_test, format_string_from_speed_test) {
EXPECT_EQ("1.2340000000:0042:+3.13:str:0x3e8:X:%",
fmt::format("{0:0.10f}:{1:04}:{2:+g}:{3}:{4}:{5}:%", 1.234, 42,
3.13, "str", reinterpret_cast<void*>(1000), 'X'));
}
TEST(format_test, format_examples) {
std::string message = fmt::format("The answer is {}", 42);
EXPECT_EQ("The answer is 42", message);
EXPECT_EQ(fmt::format("{}", 42), "42");
memory_buffer out;
fmt::format_to(std::back_inserter(out), "The answer is {}.", 42);
EXPECT_EQ("The answer is 42.", to_string(out));
EXPECT_THROW(
{
const char* filename = "madeup";
FILE* file = fopen(filename, "r");
if (!file)
throw fmt::system_error(errno, "cannot open file '{}'", filename);
fclose(file);
},
std::system_error);
EXPECT_EQ("First, thou shalt count to three",
fmt::format("First, thou shalt count to {0}", "three"));
EXPECT_EQ(fmt::format("Bring me a {}", "shrubbery"), "Bring me a shrubbery");
EXPECT_EQ(fmt::format("From {} to {}", 1, 3), "From 1 to 3");
char buffer[buffer_size];
safe_sprintf(buffer, "%03.2f", -1.2);
EXPECT_EQ(buffer, fmt::format("{:03.2f}", -1.2));
EXPECT_EQ(fmt::format("{0}, {1}, {2}", 'a', 'b', 'c'), "a, b, c");
EXPECT_EQ(fmt::format("{}, {}, {}", 'a', 'b', 'c'), "a, b, c");
EXPECT_EQ(fmt::format("{2}, {1}, {0}", 'a', 'b', 'c'), "c, b, a");
EXPECT_EQ(fmt::format("{0}{1}{0}", "abra", "cad"), "abracadabra");
EXPECT_EQ("left aligned ",
fmt::format("{:<30}", "left aligned"));
EXPECT_EQ(" right aligned",
fmt::format("{:>30}", "right aligned"));
EXPECT_EQ(" centered ",
fmt::format("{:^30}", "centered"));
EXPECT_EQ("***********centered***********",
fmt::format("{:*^30}", "centered"));
EXPECT_EQ(fmt::format("{:+f}; {:+f}", 3.14, -3.14), "+3.140000; -3.140000");
EXPECT_EQ(fmt::format("{: f}; {: f}", 3.14, -3.14), " 3.140000; -3.140000");
EXPECT_EQ(fmt::format("{:-f}; {:-f}", 3.14, -3.14), "3.140000; -3.140000");
EXPECT_EQ("int: 42; hex: 2a; oct: 52",
fmt::format("int: {0:d}; hex: {0:x}; oct: {0:o}", 42));
EXPECT_EQ("int: 42; hex: 0x2a; oct: 052",
fmt::format("int: {0:d}; hex: {0:#x}; oct: {0:#o}", 42));
EXPECT_EQ(fmt::format("The answer is {}", 42), "The answer is 42");
EXPECT_THROW_MSG(
(void)fmt::format(runtime("The answer is {:d}"), "forty-two"),
format_error, "invalid format specifier");
EXPECT_WRITE(
stdout, fmt::print("{}", std::numeric_limits<double>::infinity()), "inf");
}
TEST(format_test, print) {
EXPECT_WRITE(stdout, fmt::print("Don't {}!", "panic"), "Don't panic!");
EXPECT_WRITE(stderr, fmt::print(stderr, "Don't {}!", "panic"),
"Don't panic!");
EXPECT_WRITE(stdout, fmt::println("Don't {}!", "panic"), "Don't panic!\n");
EXPECT_WRITE(stderr, fmt::println(stderr, "Don't {}!", "panic"),
"Don't panic!\n");
}
TEST(format_test, big_print) {
enum { count = 5000 };
auto big_print = []() {
for (int i = 0; i < count / 5; ++i) fmt::print("xxxxx");
};
EXPECT_WRITE(stdout, big_print(), std::string(count, 'x'));
}
struct deadlockable {
int value = 0;
mutable std::mutex mutex;
};
FMT_BEGIN_NAMESPACE
template <> struct formatter<deadlockable> {
FMT_CONSTEXPR auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
auto format(const deadlockable& d, format_context& ctx) const
-> decltype(ctx.out()) {
std::lock_guard<std::mutex> lock(d.mutex);
return format_to(ctx.out(), "{}", d.value);
}
};
FMT_END_NAMESPACE
TEST(format_test, locking_formatter) {
auto f = fmt::buffered_file();
try {
f = fmt::buffered_file("/dev/null", "w");
} catch (const std::system_error&) {
fmt::print(stderr, "warning: /dev/null is not supported\n");
return;
}
deadlockable d;
auto t = std::thread([&]() {
fmt::print(f.get(), "start t\n");
std::lock_guard<std::mutex> lock(d.mutex);
for (int i = 0; i < 1000000; ++i) d.value += 10;
fmt::print(f.get(), "done\n");
});
for (int i = 0; i < 100; ++i) fmt::print(f.get(), "{}", d);
t.join();
}
TEST(format_test, variadic) {
EXPECT_EQ(fmt::format("{}c{}", "ab", 1), "abc1");
}
TEST(format_test, bytes) {
auto s = fmt::format("{:10}", fmt::bytes("ёжик"));
EXPECT_EQ("ёжик ", s);
EXPECT_EQ(10, s.size());
}
TEST(format_test, group_digits_view) {
EXPECT_EQ(fmt::format("{}", fmt::group_digits(10000000)), "10,000,000");
EXPECT_EQ(fmt::format("{:8}", fmt::group_digits(1000)), " 1,000");
EXPECT_EQ(fmt::format("{}", fmt::group_digits(-10000000)), "-10,000,000");
EXPECT_EQ(fmt::format("{:8}", fmt::group_digits(-1000)), " -1,000");
EXPECT_EQ(fmt::format("{:8}", fmt::group_digits(-100)), " -100");
}
#ifdef __cpp_generic_lambdas
struct point {
double x, y;
};
FMT_BEGIN_NAMESPACE
template <> struct formatter<point> : nested_formatter<double> {
auto format(point p, format_context& ctx) const -> decltype(ctx.out()) {
return write_padded(ctx, [this, p](auto out) -> decltype(out) {
return fmt::format_to(out, "({}, {})", this->nested(p.x),
this->nested(p.y));
});
}
};
FMT_END_NAMESPACE
TEST(format_test, nested_formatter) {
EXPECT_EQ(fmt::format("{:>16.2f}", point{1, 2}), " (1.00, 2.00)");
}
#endif // __cpp_generic_lambdas
enum test_enum { foo, bar };
auto format_as(test_enum e) -> int { return e; }
std::string vformat_message(int id, const char* format, fmt::format_args args) {
auto buffer = fmt::memory_buffer();
fmt::format_to(fmt::appender(buffer), "[{}] ", id);
vformat_to(fmt::appender(buffer), format, args);
return to_string(buffer);
}
template <typename... Args>
std::string format_message(int id, const char* format, const Args&... args) {
auto va = fmt::make_format_args(args...);
return vformat_message(id, format, va);
}
TEST(format_test, format_message_example) {
EXPECT_EQ("[42] something happened",
format_message(42, "{} happened", "something"));
}
template <typename... Args>
void print_error(const char* file, int line, const char* format,
const Args&... args) {
fmt::print("{}: {}: ", file, line);
fmt::print(format, args...);
}
TEST(format_test, unpacked_args) {
EXPECT_EQ("0123456789abcdefg",
fmt::format("{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}", 0, 1, 2, 3, 4, 5,
6, 7, 8, 9, 'a', 'b', 'c', 'd', 'e', 'f', 'g'));
}
constexpr char with_null[3] = {'{', '}', '\0'};
constexpr char no_null[2] = {'{', '}'};
static constexpr char static_with_null[3] = {'{', '}', '\0'};
static constexpr char static_no_null[2] = {'{', '}'};
TEST(format_test, compile_time_string) {
EXPECT_EQ(fmt::format(FMT_STRING("foo")), "foo");
EXPECT_EQ(fmt::format(FMT_STRING("{}"), 42), "42");
#if FMT_USE_NONTYPE_TEMPLATE_ARGS
using namespace fmt::literals;
EXPECT_EQ("foobar", fmt::format(FMT_STRING("{foo}{bar}"), "bar"_a = "bar",
"foo"_a = "foo"));
EXPECT_EQ(fmt::format(FMT_STRING("")), "");
EXPECT_EQ(fmt::format(FMT_STRING(""), "arg"_a = 42), "");
EXPECT_EQ(fmt::format(FMT_STRING("{answer}"), "answer"_a = Answer()), "42");
EXPECT_EQ(fmt::format(FMT_STRING("{} {two}"), 1, "two"_a = 2), "1 2");
#endif
(void)static_with_null;
(void)static_no_null;
#ifndef _MSC_VER
EXPECT_EQ(fmt::format(FMT_STRING(static_with_null), 42), "42");
EXPECT_EQ(fmt::format(FMT_STRING(static_no_null), 42), "42");
#endif
(void)with_null;
(void)no_null;
#if FMT_CPLUSPLUS >= 201703L
EXPECT_EQ(fmt::format(FMT_STRING(with_null), 42), "42");
EXPECT_EQ(fmt::format(FMT_STRING(no_null), 42), "42");
#endif
#if defined(FMT_USE_STRING_VIEW) && FMT_CPLUSPLUS >= 201703L
EXPECT_EQ(fmt::format(FMT_STRING(std::string_view("{}")), 42), "42");
#endif
}
TEST(format_test, custom_format_compile_time_string) {
EXPECT_EQ(fmt::format(FMT_STRING("{}"), Answer()), "42");
auto answer = Answer();
EXPECT_EQ(fmt::format(FMT_STRING("{}"), answer), "42");
char buf[10] = {};
fmt::format_to(buf, FMT_STRING("{}"), answer);
const Answer const_answer = Answer();
EXPECT_EQ(fmt::format(FMT_STRING("{}"), const_answer), "42");
}
TEST(format_test, named_arg_udl) {
using namespace fmt::literals;
auto udl_a = fmt::format("{first}{second}{first}{third}", "first"_a = "abra",
"second"_a = "cad", "third"_a = 99);
EXPECT_EQ(
fmt::format("{first}{second}{first}{third}", fmt::arg("first", "abra"),
fmt::arg("second", "cad"), fmt::arg("third", 99)),
udl_a);
EXPECT_EQ(fmt::format("{answer}", "answer"_a = Answer()), "42");
}
TEST(format_test, enum) { EXPECT_EQ(fmt::format("{}", foo), "0"); }
TEST(format_test, formatter_not_specialized) {
static_assert(!fmt::is_formattable<fmt::formatter<test_enum>,
fmt::format_context>::value,
"");
}
#if FMT_HAS_FEATURE(cxx_strong_enums)
enum big_enum : unsigned long long { big_enum_value = 5000000000ULL };
auto format_as(big_enum e) -> unsigned long long { return e; }
TEST(format_test, strong_enum) {
auto arg = fmt::basic_format_arg<fmt::context>(big_enum_value);
EXPECT_EQ(arg.type(), fmt::detail::type::ulong_long_type);
EXPECT_EQ(fmt::format("{}", big_enum_value), "5000000000");
}
#endif
TEST(format_test, non_null_terminated_format_string) {
EXPECT_EQ(fmt::format(string_view("{}foo", 2), 42), "42");
}
namespace adl_test {
namespace fmt {
namespace detail {
struct foo {};
template <typename, typename OutputIt> void write(OutputIt, foo) = delete;
} // namespace detail
} // namespace fmt
} // namespace adl_test
FMT_BEGIN_NAMESPACE
template <>
struct formatter<adl_test::fmt::detail::foo> : formatter<std::string> {
auto format(adl_test::fmt::detail::foo, format_context& ctx) const
-> decltype(ctx.out()) {
return formatter<std::string>::format("foo", ctx);
}
};
FMT_END_NAMESPACE
TEST(format_test, to_string) {
EXPECT_EQ(fmt::to_string(42), "42");
EXPECT_EQ(fmt::to_string(reinterpret_cast<void*>(0x1234)), "0x1234");
EXPECT_EQ(fmt::to_string(adl_test::fmt::detail::foo()), "foo");
EXPECT_EQ(fmt::to_string(foo), "0");
#if FMT_USE_FLOAT128
EXPECT_EQ(fmt::to_string(__float128(0.5)), "0.5");
#endif
#if defined(FMT_USE_STRING_VIEW) && FMT_CPLUSPLUS >= 201703L
EXPECT_EQ(fmt::to_string(std::string_view()), "");
#endif
}
TEST(format_test, output_iterators) {
std::list<char> out;
fmt::format_to(std::back_inserter(out), "{}", 42);
EXPECT_EQ("42", std::string(out.begin(), out.end()));
std::stringstream s;
fmt::format_to(std::ostream_iterator<char>(s), "{}", 42);
EXPECT_EQ("42", s.str());
std::stringstream s2;
fmt::format_to(std::ostreambuf_iterator<char>(s2), "{}.{:06d}", 42, 43);
EXPECT_EQ("42.000043", s2.str());
}
TEST(format_test, fill_via_appender) {
fmt::memory_buffer buf;
auto it = fmt::appender(buf);
std::fill_n(it, 3, '~');
EXPECT_EQ(fmt::to_string(buf), "~~~");
}
TEST(format_test, formatted_size) {
EXPECT_EQ(2u, fmt::formatted_size("{}", 42));
EXPECT_EQ(2u, fmt::formatted_size(std::locale(), "{}", 42));
}
TEST(format_test, format_to_no_args) {
std::string s;
fmt::format_to(std::back_inserter(s), "test");
EXPECT_EQ("test", s);
}
TEST(format_test, format_to) {
std::string s;
fmt::format_to(std::back_inserter(s), "part{0}", 1);
EXPECT_EQ("part1", s);
fmt::format_to(std::back_inserter(s), "part{0}", 2);
EXPECT_EQ("part1part2", s);
}
TEST(format_test, format_to_memory_buffer) {
auto buf = fmt::basic_memory_buffer<char, 100>();
fmt::format_to(fmt::appender(buf), "{}", "foo");
EXPECT_EQ("foo", to_string(buf));
}
TEST(format_test, format_to_vector) {
std::vector<char> v;
fmt::format_to(std::back_inserter(v), "{}", "foo");
EXPECT_EQ(string_view(v.data(), v.size()), "foo");
}
struct nongrowing_container {
using value_type = char;
void push_back(char) { throw std::runtime_error("can't take it any more"); }
};
TEST(format_test, format_to_propagates_exceptions) {
auto c = nongrowing_container();
EXPECT_THROW(fmt::format_to(std::back_inserter(c), "{}", 42),
std::runtime_error);
}
TEST(format_test, format_to_n) {
char buffer[4];
buffer[3] = 'x';
auto result = fmt::format_to_n(buffer, 3, "{}", 12345);
EXPECT_EQ(5u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ("123x", fmt::string_view(buffer, 4));
result = fmt::format_to_n(buffer, 3, "{:s}", "foobar");
EXPECT_EQ(6u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ("foox", fmt::string_view(buffer, 4));
buffer[0] = 'x';
buffer[1] = 'x';
buffer[2] = 'x';
result = fmt::format_to_n(buffer, 3, "{}", 'A');
EXPECT_EQ(1u, result.size);
EXPECT_EQ(buffer + 1, result.out);
EXPECT_EQ("Axxx", fmt::string_view(buffer, 4));
result = fmt::format_to_n(buffer, 3, "{}{} ", 'B', 'C');
EXPECT_EQ(3u, result.size);
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ("BC x", fmt::string_view(buffer, 4));
result = fmt::format_to_n(buffer, 4, "{}", "ABCDE");
EXPECT_EQ(5u, result.size);
EXPECT_EQ("ABCD", fmt::string_view(buffer, 4));
buffer[3] = 'x';
result = fmt::format_to_n(buffer, 3, "{}", std::string(1000, '*'));
EXPECT_EQ(1000u, result.size);
EXPECT_EQ("***x", fmt::string_view(buffer, 4));
}
struct test_output_iterator {
char* data;
using iterator_category = std::output_iterator_tag;
using value_type = void;
using difference_type = void;
using pointer = void;
using reference = void;
auto operator++() -> test_output_iterator& {
++data;
return *this;
}
auto operator++(int) -> test_output_iterator {
auto tmp = *this;
++data;
return tmp;
}
auto operator*() -> char& { return *data; }
};
TEST(format_test, format_to_n_output_iterator) {
char buf[10] = {};
fmt::format_to_n(test_output_iterator{buf}, 10, "{}", 42);
EXPECT_STREQ(buf, "42");
}
TEST(format_test, vformat_to) {
using context = fmt::format_context;
int n = 42;
auto args = fmt::make_format_args<context>(n);
auto s = std::string();
fmt::vformat_to(std::back_inserter(s), "{}", args);
EXPECT_EQ(s, "42");
s.clear();
fmt::vformat_to(std::back_inserter(s), "{}", args);
EXPECT_EQ(s, "42");
}
TEST(format_test, char_traits_not_ambiguous) {
// Test that we don't inject detail names into the std namespace.
using namespace std;
auto c = char_traits<char>::char_type();
(void)c;
#if FMT_CPLUSPLUS >= 201103L
auto s = std::string();
auto lval = begin(s);
(void)lval;
#endif
}
struct check_back_appender {};
FMT_BEGIN_NAMESPACE
template <> struct formatter<check_back_appender> {
FMT_CONSTEXPR auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
template <typename Context>
auto format(check_back_appender, Context& ctx) const -> decltype(ctx.out()) {
auto out = ctx.out();
static_assert(std::is_same<decltype(++out), decltype(out)&>::value,
"needs to satisfy weakly_incrementable");
*out = 'y';
return ++out;
}
};
FMT_END_NAMESPACE
TEST(format_test, back_insert_slicing) {
EXPECT_EQ(fmt::format("{}", check_back_appender{}), "y");
}
namespace test {
enum class scoped_enum_as_int {};
auto format_as(scoped_enum_as_int) -> int { return 42; }
enum class scoped_enum_as_string_view {};
auto format_as(scoped_enum_as_string_view) -> fmt::string_view { return "foo"; }
enum class scoped_enum_as_string {};
auto format_as(scoped_enum_as_string) -> std::string { return "foo"; }
struct struct_as_int {};
auto format_as(struct_as_int) -> int { return 42; }
struct struct_as_const_reference {
const std::string name = "foo";
};
auto format_as(const struct_as_const_reference& s) -> const std::string& {
return s.name;
}
} // namespace test
TEST(format_test, format_as) {
EXPECT_EQ(fmt::format("{}", test::scoped_enum_as_int()), "42");
EXPECT_EQ(fmt::format("{}", test::scoped_enum_as_string_view()), "foo");
EXPECT_EQ(fmt::format("{}", test::scoped_enum_as_string()), "foo");
EXPECT_EQ(fmt::format("{}", test::struct_as_int()), "42");
EXPECT_EQ(fmt::format("{}", test::struct_as_const_reference()), "foo");
}
TEST(format_test, format_as_to_string) {
EXPECT_EQ(fmt::to_string(test::scoped_enum_as_int()), "42");
EXPECT_EQ(fmt::to_string(test::scoped_enum_as_string_view()), "foo");
EXPECT_EQ(fmt::to_string(test::scoped_enum_as_string()), "foo");
EXPECT_EQ(fmt::to_string(test::struct_as_int()), "42");
}
template <typename Char, typename T> auto check_enabled_formatter() -> bool {
static_assert(std::is_default_constructible<fmt::formatter<T, Char>>::value,
"");
return true;
}
template <typename Char, typename... T> void check_enabled_formatters() {
auto dummy = {check_enabled_formatter<Char, T>()...};
(void)dummy;
}
TEST(format_test, test_formatters_enabled) {
using custom_string =
std::basic_string<char, std::char_traits<char>, mock_allocator<char>>;
using custom_wstring = std::basic_string<wchar_t, std::char_traits<wchar_t>,
mock_allocator<wchar_t>>;
check_enabled_formatters<char, bool, char, signed char, unsigned char, short,
unsigned short, int, unsigned, long, unsigned long,
long long, unsigned long long, float, double,
long double, void*, const void*, char*, const char*,
std::string, custom_string, std::nullptr_t>();
check_enabled_formatters<
wchar_t, bool, wchar_t, signed char, unsigned char, short, unsigned short,
int, unsigned, long, unsigned long, long long, unsigned long long, float,
double, long double, void*, const void*, wchar_t*, const wchar_t*,
std::wstring, custom_wstring, std::nullptr_t>();
}
TEST(format_int_test, data) {
fmt::format_int format_int(42);
EXPECT_EQ(std::string(format_int.data(), format_int.size()), "42");
}
TEST(format_int_test, format_int) {
EXPECT_EQ(fmt::format_int(42).str(), "42");
EXPECT_EQ(fmt::format_int(42).size(), 2u);
EXPECT_EQ(fmt::format_int(-42).str(), "-42");
EXPECT_EQ(fmt::format_int(-42).size(), 3u);
EXPECT_EQ(fmt::format_int(42ul).str(), "42");
EXPECT_EQ(fmt::format_int(-42l).str(), "-42");
EXPECT_EQ(fmt::format_int(42ull).str(), "42");
EXPECT_EQ(fmt::format_int(-42ll).str(), "-42");
EXPECT_EQ(fmt::format_int(max_value<int64_t>()).str(),
std::to_string(max_value<int64_t>()));
}
#ifndef FMT_STATIC_THOUSANDS_SEPARATOR
# include <locale>
class format_facet : public fmt::format_facet<std::locale> {
protected:
struct int_formatter {
fmt::appender out;
template <typename T, FMT_ENABLE_IF(fmt::detail::is_integer<T>::value)>
auto operator()(T value) -> bool {
fmt::format_to(out, "[{}]", value);
return true;
}
template <typename T, FMT_ENABLE_IF(!fmt::detail::is_integer<T>::value)>
auto operator()(T) -> bool {
return false;
}
};
auto do_put(fmt::appender out, fmt::loc_value val,
const fmt::format_specs&) const -> bool override;
};
auto format_facet::do_put(fmt::appender out, fmt::loc_value val,
const fmt::format_specs&) const -> bool {
return val.visit(int_formatter{out});
}
TEST(format_test, format_facet) {
auto loc = std::locale(std::locale(), new format_facet());
EXPECT_EQ(fmt::format(loc, "{:L}", 42), "[42]");
EXPECT_EQ(fmt::format(loc, "{:L}", -42), "[-42]");
}
TEST(format_test, format_facet_separator) {
// U+2019 RIGHT SINGLE QUOTATION MARK is a digit separator in the de_CH
// locale.
auto loc =
std::locale({}, new fmt::format_facet<std::locale>("\xe2\x80\x99"));
EXPECT_EQ(fmt::format(loc, "{:L}", 1000),
"1\xe2\x80\x99"
"000");
}
TEST(format_test, format_facet_grouping) {
auto loc =
std::locale({}, new fmt::format_facet<std::locale>(",", {1, 2, 3}));
EXPECT_EQ(fmt::format(loc, "{:L}", 1234567890), "1,234,567,89,0");
}
TEST(format_test, format_named_arg_with_locale) {
EXPECT_EQ(fmt::format(std::locale(), "{answer}", fmt::arg("answer", 42)),
"42");
}
TEST(format_test, format_locale) {
auto loc = std::locale({}, new fmt::format_facet<std::locale>(","));
EXPECT_EQ(fmt::format(loc, "{:Lx}", 123456789), "7,5bc,d15");
EXPECT_EQ(fmt::format(loc, "{:#Lb}", -123456789),
"-0b111,010,110,111,100,110,100,010,101");
EXPECT_EQ(fmt::format(loc, "{:10Lo}", 12345), " 30,071");
}
#endif // FMT_STATIC_THOUSANDS_SEPARATOR
struct convertible_to_nonconst_cstring {
operator char*() const {
static char c[] = "bar";
return c;
}
};
FMT_BEGIN_NAMESPACE
template <>
struct formatter<convertible_to_nonconst_cstring> : formatter<char*> {};
FMT_END_NAMESPACE
TEST(format_test, formatter_nonconst_char) {
EXPECT_EQ(fmt::format("{}", convertible_to_nonconst_cstring()), "bar");
}
namespace adl_test {
template <typename... T> void make_format_args(const T&...) = delete;
struct string : std::string {};
auto format_as(const string& s) -> std::string { return s; }
} // namespace adl_test
// Test that formatting functions compile when make_format_args is found by ADL.
TEST(format_test, adl) {
// Only check compilation and don't run the code to avoid polluting the output
// and since the output is tested elsewhere.
if (fmt::detail::const_check(true)) return;
auto s = adl_test::string();
char buf[10];
(void)fmt::format("{}", s);
fmt::format_to(buf, "{}", s);
fmt::format_to_n(buf, 10, "{}", s);
(void)fmt::formatted_size("{}", s);
fmt::print("{}", s);
fmt::print(stdout, "{}", s);
}
struct convertible_to_int {
operator int() const { return 42; }
};
struct convertible_to_cstring {
operator const char*() const { return "foo"; }
};
FMT_BEGIN_NAMESPACE
template <> struct formatter<convertible_to_int> {
FMT_CONSTEXPR auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
auto format(convertible_to_int, format_context& ctx) const
-> decltype(ctx.out()) {
auto out = ctx.out();
*out++ = 'x';
return out;
}
};
template <> struct formatter<convertible_to_cstring> {
FMT_CONSTEXPR auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
auto format(convertible_to_cstring, format_context& ctx) const
-> decltype(ctx.out()) {
auto out = ctx.out();
*out++ = 'y';
return out;
}
};
FMT_END_NAMESPACE
TEST(format_test, formatter_overrides_implicit_conversion) {
EXPECT_EQ(fmt::format("{}", convertible_to_int()), "x");
EXPECT_EQ(fmt::format("{}", convertible_to_cstring()), "y");
}
struct ustring {
using value_type = unsigned;
auto find_first_of(value_type, size_t) const -> size_t;
auto data() const -> const char*;
auto size() const -> size_t;
};
FMT_BEGIN_NAMESPACE
template <> struct formatter<ustring> : formatter<std::string> {
auto format(const ustring&, format_context& ctx) const
-> decltype(ctx.out()) {
return formatter<std::string>::format("ustring", ctx);
}
};
FMT_END_NAMESPACE
TEST(format_test, ustring) {
EXPECT_EQ(fmt::format("{}", ustring()), "ustring");
}
TEST(format_test, writer) {
auto write_to_stdout = []() {
auto w = fmt::writer(stdout);
w.print("{}", 42);
};
EXPECT_WRITE(stdout, write_to_stdout(), "42");
#if FMT_USE_FCNTL
auto pipe = fmt::pipe();
auto write_end = pipe.write_end.fdopen("w");
fmt::writer(write_end.get()).print("42");
write_end.close();
auto read_end = pipe.read_end.fdopen("r");
int n = 0;
int result = fscanf(read_end.get(), "%d", &n);
(void)result;
EXPECT_EQ(n, 42);
#endif
auto s = fmt::string_buffer();
fmt::writer(s).print("foo");
EXPECT_EQ(s.str(), "foo");
}
#if FMT_USE_FCNTL && !defined(_WIN32)
TEST(format_test, invalid_glibc_buffer) {
auto pipe = fmt::pipe();
auto write_end = pipe.write_end.fdopen("w");
auto file = write_end.get();
// This results in _IO_write_ptr < _IO_write_end.
fprintf(file, "111\n");
setvbuf(file, nullptr, _IOLBF, 0);
fmt::print(file, "------\n");
}
#endif // FMT_USE_FCNTL
#if FMT_USE_BITINT
FMT_PRAGMA_CLANG(diagnostic ignored "-Wbit-int-extension")
TEST(format_test, bitint) {
using fmt::detail::bitint;
using fmt::detail::ubitint;
EXPECT_EQ(fmt::format("{}", ubitint<3>(7)), "7");
EXPECT_EQ(fmt::format("{}", bitint<7>()), "0");
EXPECT_EQ(fmt::format("{}", ubitint<15>(31000)), "31000");
EXPECT_EQ(fmt::format("{}", bitint<16>(INT16_MIN)), "-32768");
EXPECT_EQ(fmt::format("{}", bitint<16>(INT16_MAX)), "32767");
EXPECT_EQ(fmt::format("{}", ubitint<32>(4294967295)), "4294967295");
EXPECT_EQ(fmt::format("{}", ubitint<47>(140737488355327ULL)),
"140737488355327");
EXPECT_EQ(fmt::format("{}", bitint<47>(-40737488355327LL)),
"-40737488355327");
// Check lvalues and const
auto a = bitint<8>(0);
auto b = ubitint<32>(4294967295);
const auto c = bitint<7>(0);
const auto d = ubitint<32>(4294967295);
EXPECT_EQ(fmt::format("{}", a), "0");
EXPECT_EQ(fmt::format("{}", b), "4294967295");
EXPECT_EQ(fmt::format("{}", c), "0");
EXPECT_EQ(fmt::format("{}", d), "4294967295");
static_assert(fmt::is_formattable<bitint<64>, char>{}, "");
static_assert(fmt::is_formattable<ubitint<64>, char>{}, "");
}
#endif
#ifdef __cpp_lib_byte
TEST(base_test, format_byte) {
auto s = std::string();
fmt::format_to(std::back_inserter(s), "{}", std::byte(42));
EXPECT_EQ(s, "42");
}
#endif
// Only defined after the test case.
struct incomplete_type;
extern const incomplete_type& external_instance;
FMT_BEGIN_NAMESPACE
template <> struct formatter<incomplete_type> : formatter<int> {
auto format(const incomplete_type& x, context& ctx) const -> appender;
};
FMT_END_NAMESPACE
TEST(incomplete_type_test, format) {
EXPECT_EQ(fmt::format("{}", external_instance), "42");
}
struct incomplete_type {};
const incomplete_type& external_instance = {};
auto fmt::formatter<incomplete_type>::format(const incomplete_type&,
fmt::context& ctx) const
-> fmt::appender {
return formatter<int>::format(42, ctx);
}
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