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wip improve nameof_enum

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terik23 2019-03-24 16:23:41 +05:00
parent cb12e1965c
commit dc8d46685e
1 changed files with 15 additions and 2 deletions
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17
include/nameof.hpp
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@ -33,14 +33,22 @@
#include <cstddef> #include <cstddef>
#include <type_traits> #include <type_traits>
#include <limits>
#include <string_view> #include <string_view>
#if !defined(NAMEOF_ENUM_MAX_SEARCH_DEPTH) #if !defined(NAMEOF_ENUM_MAX_SEARCH_DEPTH)
# define NAMEOF_ENUM_MAX_SEARCH_DEPTH 256 # define NAMEOF_ENUM_MAX_SEARCH_DEPTH 128
#endif #endif
namespace nameof { namespace nameof {
static_assert(NAMEOF_ENUM_MAX_SEARCH_DEPTH > 0,
"NAMEOF_ENUM_MAX_SEARCH_DEPTH must be positive and greater than zero.");
static_assert(NAMEOF_ENUM_MAX_SEARCH_DEPTH % 8 == 0,
"NAMEOF_ENUM_MAX_SEARCH_DEPTH must be a multiple of 8.");
static_assert(NAMEOF_ENUM_MAX_SEARCH_DEPTH < std::numeric_limits<int>::max(),
"NAMEOF_ENUM_MAX_SEARCH_DEPTH must be less INT_MAX.");
namespace detail { namespace detail {
template <typename T> template <typename T>
@ -154,6 +162,10 @@ template <typename E, E V>
template <typename E, int V> template <typename E, int V>
struct nameof_enum_t final { struct nameof_enum_t final {
[[nodiscard]] constexpr std::string_view operator()(int value) const noexcept { [[nodiscard]] constexpr std::string_view operator()(int value) const noexcept {
if constexpr (V > std::numeric_limits<std::underlying_type_t<E>>::max()) {
return {"nameof_enum::out_of_range"};
}
switch (value - V) { switch (value - V) {
case 0: case 0:
return nameof_enum_impl<E, static_cast<E>(V)>(); return nameof_enum_impl<E, static_cast<E>(V)>();
@ -242,7 +254,8 @@ template <typename T, typename = std::enable_if_t<!std::is_reference_v<T>>>
template <typename T, typename = std::enable_if_t<std::is_enum_v<std::decay_t<T>>>> template <typename T, typename = std::enable_if_t<std::is_enum_v<std::decay_t<T>>>>
[[nodiscard]] constexpr std::string_view nameof_enum(T value) noexcept { [[nodiscard]] constexpr std::string_view nameof_enum(T value) noexcept {
constexpr bool s = std::is_signed_v<std::underlying_type_t<std::decay_t<T>>>; constexpr bool s = std::is_signed_v<std::underlying_type_t<std::decay_t<T>>>;
return detail::nameof_enum_t<std::decay_t<T>, s ? -NAMEOF_ENUM_MAX_SEARCH_DEPTH : 0>{}(static_cast<int>(value)); constexpr int min = s ? -MAGIC_ENUM_MAX_SEARCH_DEPTH : 0;
return detail::nameof_enum_t<std::decay_t<T>, min>{}(static_cast<int>(value));
} }
template <typename T> template <typename T>