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Adapt any string-like type to be used by {fmt} just like the standard string types already supported. The adaption is totally non-intrusive.

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Signed-off-by: Daniela Engert <dani@ngrt.de>
This commit is contained in:
Daniela Engert
2018-10-08 20:14:39 +02:00
committed by Victor Zverovich
parent 846c644e84
commit 2c81c851b2
6 changed files with 184 additions and 73 deletions
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79
test/core-test.cc
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@@ -13,6 +13,7 @@
#include <limits>
#include <string>
#include <type_traits>
#include <memory>
#include "test-assert.h"
@@ -451,6 +452,47 @@ TEST(CoreTest, IsEnumConvertibleToInt) {
EXPECT_TRUE((fmt::convert_to_int<enum_with_underlying_type, char>::value));
}
namespace my_ns {
template <typename Char>
class my_string {
public:
my_string(const Char *s) : s_(s) {}
const Char * data() const FMT_NOEXCEPT { return s_.data(); }
std::size_t length() const FMT_NOEXCEPT { return s_.size(); }
operator const Char*() const { return s_.c_str(); }
private:
std::basic_string<Char> s_;
};
template <typename Char>
inline fmt::basic_string_view<Char>
to_string_view(const my_string<Char> &s) FMT_NOEXCEPT {
return { s.data(), s.length() };
}
struct non_string {};
}
namespace FakeQt {
class QString {
public:
QString(const wchar_t *s) : s_(std::make_shared<std::wstring>(s)) {}
const wchar_t *utf16() const FMT_NOEXCEPT { return s_->data(); }
int size() const FMT_NOEXCEPT { return static_cast<int>(s_->size()); }
#ifdef FMT_STRING_VIEW
operator FMT_STRING_VIEW<wchar_t>() const FMT_NOEXCEPT { return *s_; }
#endif
private:
std::shared_ptr<std::wstring> s_;
};
inline fmt::basic_string_view<wchar_t> to_string_view(
const QString &s) FMT_NOEXCEPT {
return {reinterpret_cast<const wchar_t *>(s.utf16()),
static_cast<std::size_t>(s.size())};
}
}
template <typename T>
class IsStringTest : public testing::Test {};
@@ -468,11 +510,16 @@ TYPED_TEST(IsStringTest, IsString) {
EXPECT_TRUE((fmt::internal::is_string<TypeParam[2]>::value));
EXPECT_TRUE((fmt::internal::is_string<const TypeParam[2]>::value));
EXPECT_TRUE((fmt::internal::is_string<std::basic_string<TypeParam>>::value));
EXPECT_TRUE((fmt::internal::is_string<fmt::basic_string_view<TypeParam>>::value));
EXPECT_TRUE((fmt::internal::is_string<derived_from_string_view<TypeParam>>::value));
EXPECT_TRUE(
(fmt::internal::is_string<fmt::basic_string_view<TypeParam>>::value));
EXPECT_TRUE(
(fmt::internal::is_string<derived_from_string_view<TypeParam>>::value));
#ifdef FMT_STRING_VIEW
EXPECT_TRUE((fmt::internal::is_string<FMT_STRING_VIEW<TypeParam>>::value));
#endif
EXPECT_TRUE((fmt::internal::is_string<my_ns::my_string<TypeParam>>::value));
EXPECT_FALSE((fmt::internal::is_string<my_ns::non_string>::value));
EXPECT_TRUE((fmt::internal::is_string<FakeQt::QString>::value));
}
TEST(CoreTest, Format) {
@@ -482,3 +529,31 @@ TEST(CoreTest, Format) {
#endif
EXPECT_EQ(fmt::format("{}", 42), "42");
}
TEST(CoreTest, ToStringViewForeignStrings) {
using namespace my_ns;
using namespace FakeQt;
EXPECT_EQ(to_string_view(my_string<char>("42")), "42");
EXPECT_EQ(to_string_view(my_string<wchar_t>(L"42")), L"42");
EXPECT_EQ(to_string_view(QString(L"42")), L"42");
fmt::internal::type type =
fmt::internal::get_type<fmt::format_context, my_string<char>>::value;
EXPECT_EQ(type, fmt::internal::string_type);
type =
fmt::internal::get_type<fmt::wformat_context, my_string<wchar_t>>::value;
EXPECT_EQ(type, fmt::internal::string_type);
type = fmt::internal::get_type<fmt::wformat_context, QString>::value;
EXPECT_EQ(type, fmt::internal::string_type);
// Does not compile: only wide format contexts are compatible with QString!
// type = fmt::internal::get_type<fmt::format_context, QString>::value;
}
TEST(CoreTest, FormatForeignStrings) {
using namespace my_ns;
using namespace FakeQt;
EXPECT_EQ(fmt::format(my_string<char>("{}"), 42), "42");
EXPECT_EQ(fmt::format(my_string<wchar_t>(L"{}"), 42), L"42");
EXPECT_EQ(fmt::format(QString(L"{}"), 42), L"42");
EXPECT_EQ(fmt::format(QString(L"{}"), my_string<wchar_t>(L"42")), L"42");
EXPECT_EQ(fmt::format(my_string<wchar_t>(L"{}"), QString(L"42")), L"42");
}