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Fix missing traits for earlies compilers, disable concept supoort for MSVC

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This commit is contained in:
Jerry Ma 2021-09-30 17:48:14 -04:00
parent 670f8c074c
commit 7c09add204
2 changed files with 16 additions and 6 deletions
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2
include/fmt/core.h
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@ -103,7 +103,7 @@
#endif
// Check if C++20 concepts is supported.
#if ((__cplusplus >= 202002L) && defined(__cpp_lib_concepts))
#if ((__cplusplus >= 202002L) && defined(__cpp_lib_concepts) && !FMT_MSC_VER)
# define FMT_HAS_CPP20_CONCEPTS 1
#else
# define FMT_HAS_CPP20_CONCEPTS 0

20
include/fmt/ranges.h
View File

@ -51,11 +51,21 @@ template <typename Char, typename Enable = void> struct formatting_tuple {
namespace detail {
// These are needed traits to allow correct resolution of the
// copy(...) function overloading for char[] and wchar_t[]
template <typename T> using decay_t = typename std::decay<T>::type;
template <typename T>
using remove_pointer_t = typename std::remove_pointer<T>::type;
template <typename T> struct is_char_like : std::false_type {};
// Here we only add check for wchar_t, which is inline with the
// copy(...) overload below for char and wchar_t type.
template <> struct is_char_like<char> : std::true_type {};
template <> struct is_char_like<wchar_t> : std::true_type {};
template <typename RangeT, typename OutputIterator,
FMT_ENABLE_IF(
!std::is_same_v<std::remove_cv_t<std::remove_reference_t<
std::remove_pointer_t<std::decay_t<RangeT>>>>,
char>)>
FMT_ENABLE_IF(!is_char_like<remove_cvref_t<
remove_pointer_t<decay_t<RangeT>>>>::value)>
OutputIterator copy(const RangeT& range, OutputIterator out) {
for (auto it = range.begin(), end = range.end(); it != end; ++it)
*out++ = *it;
@ -63,7 +73,7 @@ OutputIterator copy(const RangeT& range, OutputIterator out) {
}
template <typename CharT, typename OutputIterator,
FMT_ENABLE_IF(std::is_same_v<CharT, char>)>
FMT_ENABLE_IF(is_char_like<CharT>::value)>
OutputIterator copy(const CharT* str, OutputIterator out) {
while (*str) *out++ = *str++;
return out;