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improve nameof enum

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This commit is contained in:
Neargye 2018-09-01 23:16:45 +05:00
parent e32c19e70f
commit f45854ef20
1 changed files with 22 additions and 15 deletions
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37
include/nameof.hpp
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@ -385,25 +385,32 @@ NAMEOF_CONSTEXPR nameof::cstring NameofEnumImpl2() {
#endif
}
template <typename T, int I = 0>
template <typename T, int I>
struct NameofEnumImpl {
NAMEOF_CONSTEXPR nameof::cstring operator()(T value) const {
return (static_cast<int>(value) - I == 0)
? NameofEnumImpl2<T, T(0 + I)>()
: (static_cast<int>(value) >= 0)
? NameofEnumImpl<T, I + 1>{}(value)
: NameofEnumImpl<T, I - 1>{}(value);
NAMEOF_CONSTEXPR nameof::cstring operator()(int value) const {
return (value - I == 0)
? NameofEnumImpl2<T, T(I)>()
: (value - I == 1)
? NameofEnumImpl2<T, T(I + 1)>()
: (value - I == 2)
? NameofEnumImpl2<T, T(I + 2)>()
: (value - I == 3)
? NameofEnumImpl2<T, T(I + 3)>()
: (value - I == 4)
? NameofEnumImpl2<T, T(I + 4)>()
: (value - I == 5)
? NameofEnumImpl2<T, T(I + 5)>()
: (value - I == 6)
? NameofEnumImpl2<T, T(I + 6)>()
: (value - I == 7)
? NameofEnumImpl2<T, T(I + 7)>()
: NameofEnumImpl<T, I + 8>{}(value);
}
};
template <typename T>
struct NameofEnumImpl<T, NAMEOF_ENUM_MAX_SEARCH_DEPTH> {
NAMEOF_CONSTEXPR nameof::cstring operator()(T) const { return {}; }
};
template <typename T>
struct NameofEnumImpl<T, -NAMEOF_ENUM_MAX_SEARCH_DEPTH> {
NAMEOF_CONSTEXPR nameof::cstring operator()(T) const { return {}; }
NAMEOF_CONSTEXPR nameof::cstring operator()(int) const { return {}; }
};
template <typename T>
@ -447,9 +454,9 @@ template <typename T,
typename = typename std::enable_if<!std::is_reference<T>::value && std::is_enum<T>::value>::type>
NAMEOF_CONSTEXPR cstring NameofEnum(T value) {
#if defined(__clang__) || defined(_MSC_VER)
return detail::NameofPretty(detail::NameofEnumImpl<T>{}(value), false);
return detail::NameofPretty(detail::NameofEnumImpl<T, -NAMEOF_ENUM_MAX_SEARCH_DEPTH>{}(static_cast<int>(value)), false);
#elif defined(__GNUC__)
return detail::NameofEnumImpl<T>{}(value);
return detail::NameofEnumImpl<T, -NAMEOF_ENUM_MAX_SEARCH_DEPTH>{}(static_cast<int>(value));
#else
return {};
#endif