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Add detection of wostream operator<< (#650)

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This commit is contained in:
Victor Zverovich
2018-02-17 09:03:43 +00:00
parent 1efc15c177
commit 91721caa42
4 changed files with 17 additions and 16 deletions
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12
include/fmt/core.h
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@@ -413,7 +413,7 @@ FMT_CONSTEXPR bool is_arithmetic(type t) {
return t > internal::none_type && t <= internal::last_numeric_type;
}
template <typename T, bool ENABLE = true>
template <typename T, typename Char, bool ENABLE = true>
struct convert_to_int {
enum {
value = !std::is_arithmetic<T>::value && std::is_convertible<T, int>::value
@@ -421,8 +421,8 @@ struct convert_to_int {
};
#define FMT_DISABLE_CONVERSION_TO_INT(Type) \
template <> \
struct convert_to_int<Type> { enum { value = 0 }; }
template <typename Char> \
struct convert_to_int<Type, Char> { enum { value = 0 }; }
// Silence warnings about convering float to int.
FMT_DISABLE_CONVERSION_TO_INT(float);
@@ -589,13 +589,13 @@ void make_value(const T *p) {
template <typename C, typename T>
inline typename std::enable_if<
convert_to_int<T>::value && std::is_enum<T>::value,
convert_to_int<T, typename C::char_type>::value && std::is_enum<T>::value,
typed_value<C, int_type>>::type
make_value(const T &val) { return static_cast<int>(val); }
template <typename C, typename T>
inline typename std::enable_if<
!convert_to_int<T>::value, typed_value<C, custom_type>>::type
inline typename std::enable_if<!convert_to_int<
T, typename C::char_type>::value, typed_value<C, custom_type>>::type
make_value(const T &val) { return val; }
template <typename C, typename T>