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Implement the s specifier for error_code

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This commit is contained in:
Victor Zverovich
2025-04-27 08:51:18 -07:00
parent e98155a6fb
commit a7d7b894cd
2 changed files with 26 additions and 18 deletions
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12
include/fmt/std.h
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@@ -422,6 +422,12 @@ template <> struct formatter<std::error_code> {
char c = *it;
if ((c >= '0' && c <= '9') || c == '{')
it = detail::parse_width(it, end, specs_, width_ref_, ctx);
if (it == end) return it;
if (*it == 's') {
specs_.set_type(presentation_type::string);
++it;
}
return it;
}
@@ -431,10 +437,14 @@ template <> struct formatter<std::error_code> {
auto specs = specs_;
detail::handle_dynamic_spec(specs.dynamic_width(), specs.width, width_ref_,
ctx);
memory_buffer buf;
auto buf = memory_buffer();
if (specs_.type() == presentation_type::string) {
buf.append(ec.message());
} else {
buf.append(string_view(ec.category().name()));
buf.push_back(':');
detail::write<char>(appender(buf), ec.value());
}
return detail::write<char>(ctx.out(), string_view(buf.data(), buf.size()),
specs);
}

24
test/std-test.cc
View File

@@ -49,7 +49,7 @@ TEST(std_test, path) {
}
// Intentionally delayed include to test #4303
#include "fmt/ranges.h"
# include "fmt/ranges.h"
// Test ambiguity problem described in #2954.
TEST(ranges_std_test, format_vector_path) {
@@ -276,18 +276,16 @@ TEST(std_test, variant) {
TEST(std_test, error_code) {
auto& generic = std::generic_category();
EXPECT_EQ("generic:42",
fmt::format(FMT_STRING("{0}"), std::error_code(42, generic)));
EXPECT_EQ(" generic:42",
fmt::format(FMT_STRING("{:>12}"), std::error_code(42, generic)));
EXPECT_EQ("generic:42 ",
fmt::format(FMT_STRING("{:12}"), std::error_code(42, generic)));
EXPECT_EQ("system:42",
fmt::format(FMT_STRING("{0}"),
std::error_code(42, fmt::system_category())));
EXPECT_EQ("system:-42",
fmt::format(FMT_STRING("{0}"),
std::error_code(-42, fmt::system_category())));
EXPECT_EQ(fmt::format("{}", std::error_code(42, generic)), "generic:42");
EXPECT_EQ(fmt::format("{:>12}", std::error_code(42, generic)),
" generic:42");
EXPECT_EQ(fmt::format("{:12}", std::error_code(42, generic)), "generic:42 ");
EXPECT_EQ(fmt::format("{}", std::error_code(42, fmt::system_category())),
"system:42");
EXPECT_EQ(fmt::format("{}", std::error_code(-42, fmt::system_category())),
"system:-42");
auto ec = std::make_error_code(std::errc::value_too_large);
EXPECT_EQ(fmt::format("{:s}", ec), ec.message());
}
template <typename Catch> void exception_test() {