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make code c++98 compatible

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This commit is contained in:
Nicolas Fauvet 2017-01-19 11:18:37 +01:00
parent 76e7f8fe41
commit e7f13d05b8
2 changed files with 12 additions and 0 deletions
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8
fmt/format.h
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@ -267,6 +267,14 @@ typedef __int64 intmax_t;
(FMT_GCC_VERSION >= 303 && FMT_HAS_GXX_CXX11))
#endif
// Checks if decltype v1.1 is supported
// http://en.cppreference.com/w/cpp/compiler_support
#define FMT_HAS_DECLTYPE_INCOMPLETE_RETURN_TYPES \
(FMT_HAS_FEATURE(cxx_decltype_incomplete_return_types) || \
(FMT_GCC_VERSION >= 408 && FMT_HAS_GXX_CXX11) || \
FMT_MSC_VER >= 1900 || \
FMT_ICC_VERSION >= 1200)
#ifdef FMT_HEADER_ONLY
// If header only do not use extern templates.
# undef FMT_USE_EXTERN_TEMPLATES

4
fmt/ostream.h
View File

@ -74,6 +74,7 @@ struct ConvertToIntImpl<T, true> {
// Write the content of w to os.
void write(std::ostream &os, Writer &w);
#ifdef FMT_HAS_DECLTYPE_INCOMPLETE_RETURN_TYPES
template<typename T>
class is_streamable {
template<typename U>
@ -85,6 +86,7 @@ class is_streamable {
public:
static constexpr bool value = decltype(test<T>(0))::value;
};
#endif
} // namespace internal
// Formats a value.
@ -123,7 +125,9 @@ typename std::enable_if<
BasicWriter<Char>&
>::type
operator<<(BasicWriter<Char> &writer, const T &value) {
#ifdef FMT_HAS_DECLTYPE_INCOMPLETE_RETURN_TYPES
static_assert(internal::is_streamable<T>::value, "T must be Streamable");
#endif
auto &buffer = writer.buffer();
Char *start = &buffer[0] + buffer.size();