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Add a formatter specialization for std::error_code.

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This commit is contained in:
Владислав Щапов 2021-05-08 16:51:51 +05:00 committed by Victor Zverovich
parent 39f28424ca
commit 4211d86539
2 changed files with 41 additions and 0 deletions
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17
include/fmt/os.h
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@ -129,6 +129,23 @@ class error_code {
int get() const FMT_NOEXCEPT { return value_; }
};
template <typename Char> struct formatter<std::error_code, Char> {
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
template <typename FormatContext>
FMT_CONSTEXPR auto format(const std::error_code& ec, FormatContext& ctx) const
-> decltype(ctx.out()) {
auto out = ctx.out();
out = detail::write<Char>(out, to_string_view(ec.category().name()));
out = detail::write<Char>(out, Char(':'));
out = detail::write<Char>(out, ec.value());
return out;
}
};
#ifdef _WIN32
namespace detail {
// A converter from UTF-16 to UTF-8.

24
test/os-test.cc
View File

@ -74,6 +74,30 @@ TEST(os_test, error_code) {
EXPECT_EQ(error_code(42).get(), 42);
}
TEST(os_test, format_std_error_code) {
EXPECT_EQ("generic:42",
fmt::format(FMT_STRING("{0}"),
std::error_code(42, std::generic_category())));
EXPECT_EQ("system:42",
fmt::format(FMT_STRING("{0}"),
std::error_code(42, std::system_category())));
EXPECT_EQ("system:-42",
fmt::format(FMT_STRING("{0}"),
std::error_code(-42, std::system_category())));
}
TEST(os_test, format_std_error_code_wide) {
EXPECT_EQ(L"generic:42",
fmt::format(FMT_STRING(L"{0}"),
std::error_code(42, std::generic_category())));
EXPECT_EQ(L"system:42",
fmt::format(FMT_STRING(L"{0}"),
std::error_code(42, std::system_category())));
EXPECT_EQ(L"system:-42",
fmt::format(FMT_STRING(L"{0}"),
std::error_code(-42, std::system_category())));
}
TEST(os_test, format_windows_error) {
LPWSTR message = 0;
auto result = FormatMessageW(