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41
fmt/format.h
41
fmt/format.h
@ -255,6 +255,21 @@ typedef __int64 intmax_t;
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(!defined(FMT_ICC_VERSION) || FMT_ICC_VERSION >= 1500)
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#endif
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#ifndef FMT_USE_EXTERN_TEMPLATES
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// Clang doesn't have a feature check for extern templates so we check
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// for variadic templates which were introduced in the same version.
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// For GCC according to cppreference.com they were introduced in 3.3.
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# define FMT_USE_EXTERN_TEMPLATES \
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((__clang__ && FMT_USE_VARIADIC_TEMPLATES) || \
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FMT_GCC_VERSION >= 303)
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#endif
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#ifdef FMT_HEADER_ONLY
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// If header only do not use extern templates.
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# undef FMT_USE_EXTERN_TEMPLATES
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# define FMT_USE_EXTERN_TEMPLATES 0
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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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@ -812,6 +827,15 @@ class CharTraits<char> : public BasicCharTraits<char> {
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const char *format, unsigned width, int precision, T value);
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};
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#if FMT_USE_EXTERN_TEMPLATES
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extern template int CharTraits<char>::format_float<double>
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(char *buffer, std::size_t size,
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const char* format, unsigned width, int precision, double value);
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extern template int CharTraits<char>::format_float<long double
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(char *buffer, std::size_t size,
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const char* format, unsigned width, int precision, long double value);
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#endif
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template <>
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class CharTraits<wchar_t> : public BasicCharTraits<wchar_t> {
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public:
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@ -823,6 +847,15 @@ class CharTraits<wchar_t> : public BasicCharTraits<wchar_t> {
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const wchar_t *format, unsigned width, int precision, T value);
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};
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#if FMT_USE_EXTERN_TEMPLATES
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extern template int CharTraits<wchar_t>::format_float<double>
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(wchar_t *buffer, std::size_t size,
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const wchar_t* format, unsigned width, int precision, double value);
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extern template int CharTraits<wchar_t>::format_float<long double>
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(wchar_t *buffer, std::size_t size,
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const wchar_t* format, unsigned width, int precision, long double value);
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#endif
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// Checks if a number is negative - used to avoid warnings.
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template <bool IsSigned>
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struct SignChecker {
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@ -869,13 +902,7 @@ struct FMT_API BasicData {
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static const char DIGITS[];
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};
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#ifndef FMT_USE_EXTERN_TEMPLATES
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// Clang doesn't have a feature check for extern templates so we check
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// for variadic templates which were introduced in the same version.
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# define FMT_USE_EXTERN_TEMPLATES (__clang__ && FMT_USE_VARIADIC_TEMPLATES)
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#endif
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#if FMT_USE_EXTERN_TEMPLATES && !defined(FMT_HEADER_ONLY)
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#if FMT_USE_EXTERN_TEMPLATES
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extern template struct BasicData<void>;
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#endif
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