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compile-time optimization

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This commit is contained in:
neargye 2022-11-07 21:10:41 +04:00
parent 8bd403f888
commit 6fca52c1e7
1 changed files with 13 additions and 11 deletions
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24
include/magic_enum.hpp
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@ -398,15 +398,15 @@ constexpr auto n() noexcept {
#else #else
constexpr auto name = string_view{}; constexpr auto name = string_view{};
#endif #endif
return static_string<name.size()>{name}; return name;
} else { } else {
return static_string<0>{}; // Unsupported compiler or Invalid customize. return string_view{}; // Unsupported compiler or Invalid customize.
} }
} }
template <typename E> template <typename E>
constexpr auto type_name() noexcept { constexpr auto type_name() noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::n requires enum type."); static_assert(is_enum_v<E>, "magic_enum::detail::type_name requires enum type.");
[[maybe_unused]] constexpr auto custom = customize::enum_type_name<E>(); [[maybe_unused]] constexpr auto custom = customize::enum_type_name<E>();
static_assert(std::is_same_v<std::decay_t<decltype(custom)>, customize::customize_t>, "magic_enum::customize requires customize_t type."); static_assert(std::is_same_v<std::decay_t<decltype(custom)>, customize::customize_t>, "magic_enum::customize requires customize_t type.");
@ -415,7 +415,8 @@ constexpr auto type_name() noexcept {
static_assert(!name.empty(), "magic_enum::customize requires not empty string."); static_assert(!name.empty(), "magic_enum::customize requires not empty string.");
return static_string<name.size()>{name}; return static_string<name.size()>{name};
} else { } else {
return n<E>(); constexpr auto name = n<E>();
return static_string<name.size()>{name};
} }
} }
@ -434,15 +435,15 @@ constexpr auto n() noexcept {
#else #else
constexpr auto name = string_view{}; constexpr auto name = string_view{};
#endif #endif
return static_string<name.size()>{name}; return name;
} else { } else {
return static_string<0>{}; // Unsupported compiler or Invalid customize. return string_view{}; // Unsupported compiler or Invalid customize.
} }
} }
template <typename E, E V> template <typename E, E V>
constexpr auto enum_name() noexcept { constexpr auto enum_name() noexcept {
static_assert(is_enum_v<E>, "magic_enum::detail::n requires enum type."); static_assert(is_enum_v<E>, "magic_enum::detail::enum_name requires enum type.");
[[maybe_unused]] constexpr auto custom = customize::enum_name<E>(V); [[maybe_unused]] constexpr auto custom = customize::enum_name<E>(V);
static_assert(std::is_same_v<std::decay_t<decltype(custom)>, customize::customize_t>, "magic_enum::customize requires customize_t type."); static_assert(std::is_same_v<std::decay_t<decltype(custom)>, customize::customize_t>, "magic_enum::customize requires customize_t type.");
@ -451,7 +452,8 @@ constexpr auto enum_name() noexcept {
static_assert(!name.empty(), "magic_enum::customize requires not empty string."); static_assert(!name.empty(), "magic_enum::customize requires not empty string.");
return static_string<name.size()>{name}; return static_string<name.size()>{name};
} else { } else {
return n<E, V>(); constexpr auto name = n<E, V>();
return static_string<name.size()>{name};
} }
} }
@ -465,6 +467,9 @@ constexpr bool is_valid() noexcept {
#if defined(__clang__) && __clang_major__ >= 16 #if defined(__clang__) && __clang_major__ >= 16
// https://reviews.llvm.org/D130058, https://reviews.llvm.org/D131307 // https://reviews.llvm.org/D130058, https://reviews.llvm.org/D131307
constexpr E v = __builtin_bit_cast(E, V); constexpr E v = __builtin_bit_cast(E, V);
#else
constexpr E v = static_cast<E>(V);
#endif
[[maybe_unused]] constexpr auto custom = customize::enum_name<E>(v); [[maybe_unused]] constexpr auto custom = customize::enum_name<E>(v);
static_assert(std::is_same_v<std::decay_t<decltype(custom)>, customize::customize_t>, "magic_enum::customize requires customize_t type."); static_assert(std::is_same_v<std::decay_t<decltype(custom)>, customize::customize_t>, "magic_enum::customize requires customize_t type.");
if constexpr (std::is_same_v<std::decay_t<decltype(custom)>, customize::customize_t> && custom.index() == 0) { if constexpr (std::is_same_v<std::decay_t<decltype(custom)>, customize::customize_t> && custom.index() == 0) {
@ -474,9 +479,6 @@ constexpr bool is_valid() noexcept {
} else { } else {
return n<E, v>().size() != 0; return n<E, v>().size() != 0;
} }
#else
return enum_name<E, static_cast<E>(V)>().size() != 0;
#endif
} }
template <typename E, int O, bool IsFlags, typename U = std::underlying_type_t<E>> template <typename E, int O, bool IsFlags, typename U = std::underlying_type_t<E>>