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Add _format literal
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50e9487e18
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38
format.h
38
format.h
@ -177,6 +177,16 @@ inline uint32_t clzll(uint64_t x) {
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TypeName& operator=(const TypeName&)
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#endif
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#ifndef FMT_USE_USER_DEFINED_LITERALS
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// All compilers which support UDLs also support variadic templates. This
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// makes the fmt::literals implementation easier. However, an explicit check
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// for variadic templates is added here just in case.
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# define FMT_USE_USER_DEFINED_LITERALS \
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FMT_USE_VARIADIC_TEMPLATES && \
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(FMT_HAS_FEATURE(cxx_user_literals) || \
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(FMT_GCC_VERSION >= 407 && FMT_HAS_GXX_CXX11) || _MSC_VER >= 1900)
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#endif
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#ifndef FMT_ASSERT
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# define FMT_ASSERT(condition, message) assert((condition) && message)
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#endif
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@ -3005,6 +3015,34 @@ FMT_VARIADIC(int, printf, CStringRef)
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FMT_VARIADIC(int, fprintf, std::FILE *, CStringRef)
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}
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#if FMT_USE_USER_DEFINED_LITERALS
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namespace fmt {
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namespace internal {
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template <typename Char>
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struct UdlFormat {
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const Char *str;
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template <typename... Args>
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auto operator()(Args && ... args) const
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-> decltype(format(str, std::forward<Args>(args)...)) {
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return format(str, std::forward<Args>(args)...);
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}
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};
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} // namespace internal
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inline namespace literals {
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inline internal::UdlFormat<char>
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operator"" _format(const char *s, std::size_t) { return {s}; }
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inline internal::UdlFormat<wchar_t>
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operator"" _format(const wchar_t *s, std::size_t) { return {s}; }
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} // inline namespace literals
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} // namespace fmt
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#endif // FMT_USE_USER_DEFINED_LITERALS
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// Restore warnings.
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#if FMT_GCC_VERSION >= 406
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# pragma GCC diagnostic pop
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@ -1602,3 +1602,12 @@ TEST(FormatTest, MaxArgs) {
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fmt::format("{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}",
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'a', 'b', 'c', 'd', 'e'));
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}
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#if FMT_USE_USER_DEFINED_LITERALS
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using namespace fmt::literals;
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TEST(LiteralsTest, Format) {
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EXPECT_EQ(format("{}c{}", "ab", 1), "{}c{}"_format("ab", 1));
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EXPECT_EQ(format(L"{}c{}", L"ab", 1), L"{}c{}"_format(L"ab", 1));
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}
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#endif // FMT_USE_USER_DEFINED_LITERALS
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