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Move stream I/O operators to enum namespace

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Stream I/O operators defined in a global namespace caused name resolution errors in some cases.
This commit is contained in:
cheparukhin 2016-06-22 15:47:29 +01:00 committed by GitHub
parent 18cbeb0808
commit 9e522eaf3c
1 changed files with 27 additions and 40 deletions
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67
enum.h
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@ -834,7 +834,33 @@ BETTER_ENUMS_CONSTEXPR_ inline bool operator <=(const Enum &a, const Enum &b) \
BETTER_ENUMS_CONSTEXPR_ inline bool operator >(const Enum &a, const Enum &b) \ BETTER_ENUMS_CONSTEXPR_ inline bool operator >(const Enum &a, const Enum &b) \
{ return a._to_integral() > b._to_integral(); } \ { return a._to_integral() > b._to_integral(); } \
BETTER_ENUMS_CONSTEXPR_ inline bool operator >=(const Enum &a, const Enum &b) \ BETTER_ENUMS_CONSTEXPR_ inline bool operator >=(const Enum &a, const Enum &b) \
{ return a._to_integral() >= b._to_integral(); } { return a._to_integral() >= b._to_integral(); } \
\
\
template <typename Char, typename Traits> \
std::basic_ostream<Char, Traits>& \
operator <<(std::basic_ostream<Char, Traits>& stream, const Enum &value) \
{ \
return stream << value._to_string(); \
} \
\
template <typename Char, typename Traits> \
std::basic_istream<Char, Traits>& \
operator >>(std::basic_istream<Char, Traits>& stream, Enum &value) \
{ \
std::basic_string<Char, Traits> buffer; \
\
stream >> buffer; \
::better_enums::optional<Enum> converted = \
Enum::_from_string_nothrow(buffer.c_str()); \
\
if (converted) \
value = *converted; \
else \
stream.setstate(std::basic_istream<Char, Traits>::failbit); \
\
return stream; \
}
@ -1140,45 +1166,6 @@ BETTER_ENUMS_CONSTEXPR_ map<Enum, T> make_map(T (*f)(Enum))
return map<Enum, T>(f); return map<Enum, T>(f);
} }
// Stream I/O operators.
// This template is used as a sort of enable_if for SFINAE. It should be
// possible to use std::enable_if, however <type_traits> is not available in
// C++98. Non-char streams are currently not supported.
template <typename T, typename Enum>
struct only_if_enum { typedef T type; };
} }
template <typename Char, typename Traits, typename Enum>
inline typename better_enums::only_if_enum<std::basic_ostream<Char, Traits>,
typename Enum::_enumerated>::type&
operator <<(std::basic_ostream<Char, Traits>& stream, const Enum &value)
{
return stream << value._to_string();
}
template <typename Char, typename Traits, class Enum>
inline typename better_enums::only_if_enum<std::basic_istream<Char, Traits>,
typename Enum::_enumerated>::type&
operator >>(std::basic_istream<Char, Traits>& stream, Enum &value)
{
std::basic_string<Char, Traits> buffer;
stream >> buffer;
better_enums::optional<Enum> converted =
Enum::_from_string_nothrow(buffer.c_str());
if (converted)
value = *converted;
else
stream.setstate(std::basic_istream<Char, Traits>::failbit);
return stream;
}
#endif // #ifndef BETTER_ENUMS_ENUM_H #endif // #ifndef BETTER_ENUMS_ENUM_H