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compile-time optimization

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Daniil Goncharov 2022-11-09 22:00:09 +04:00 • committed by GitHub
parent 684718c58b
commit aa1f2869f4
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1 changed files with 36 additions and 15 deletions
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51
include/magic_enum.hpp
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@ -43,7 +43,6 @@
#include <limits>
#include <type_traits>
#include <utility>
#include <variant>
#if defined(MAGIC_ENUM_CONFIG_FILE)
#include MAGIC_ENUM_CONFIG_FILE
@ -141,16 +140,28 @@ static_assert(MAGIC_ENUM_RANGE_MAX > MAGIC_ENUM_RANGE_MIN, "MAGIC_ENUM_RANGE_MAX
static_assert((MAGIC_ENUM_RANGE_MAX - MAGIC_ENUM_RANGE_MIN) < (std::numeric_limits<std::uint16_t>::max)(), "MAGIC_ENUM_RANGE must be less than UINT16_MAX.");
namespace detail {
enum class default_customize_tag {};
enum class invalid_customize_tag {};
enum class customize_tag {
default_tag,
invalid_tag,
custom_tag
};
} // namespace magic_enum::customize::detail
using customize_t = std::variant<string_view, detail::default_customize_tag, detail::invalid_customize_tag>;
class customize_t : public std::pair<detail::customize_tag, string_view> {
public:
constexpr customize_t(string_view srt) : std::pair<detail::customize_tag, string_view>{detail::customize_tag::custom_tag, srt} {}
constexpr customize_t(const char* srt) : customize_t{string_view{srt}} {}
constexpr customize_t(detail::customize_tag tag) : std::pair<detail::customize_tag, string_view>{tag, string_view{}} {
assert(tag != detail::customize_tag::custom_tag);
}
};
// Default customize.
inline constexpr auto default_tag = detail::default_customize_tag{};
inline constexpr auto default_tag = customize_t{detail::customize_tag::default_tag};
// Invalid customize.
inline constexpr auto invalid_tag = detail::invalid_customize_tag{};
inline constexpr auto invalid_tag = customize_t{detail::customize_tag::invalid_tag};
// If need custom names for enum, add specialization enum_name for necessary enum type.
template <typename E>
@ -409,13 +420,17 @@ constexpr auto type_name() noexcept {
[[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.");
if constexpr (std::is_same_v<std::decay_t<decltype(custom)>, customize::customize_t> && custom.index() == 0) {
constexpr auto name = std::get<string_view>(custom);
if constexpr (custom.first == customize::detail::customize_tag::custom_tag) {
constexpr auto name = custom.second;
static_assert(!name.empty(), "magic_enum::customize requires not empty string.");
return static_string<name.size()>{name};
} else {
} else if constexpr (custom.first == customize::detail::customize_tag::invalid_tag) {
return static_string<0>{};
} else if constexpr (custom.first == customize::detail::customize_tag::default_tag) {
constexpr auto name = n<E>();
return static_string<name.size()>{name};
} else {
static_assert(detail::always_false_v<E>, "magic_enum::customize invalid.");
}
}
@ -446,13 +461,17 @@ constexpr auto enum_name() noexcept {
[[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.");
if constexpr (std::is_same_v<std::decay_t<decltype(custom)>, customize::customize_t> && custom.index() == 0) {
constexpr auto name = std::get<string_view>(custom);
if constexpr (custom.first == customize::detail::customize_tag::custom_tag) {
constexpr auto name = custom.second;
static_assert(!name.empty(), "magic_enum::customize requires not empty string.");
return static_string<name.size()>{name};
} else {
} else if constexpr (custom.first == customize::detail::customize_tag::invalid_tag) {
return static_string<0>{};
} else if constexpr (custom.first == customize::detail::customize_tag::default_tag) {
constexpr auto name = n<E, V>();
return static_string<name.size()>{name};
} else {
static_assert(detail::always_false_v<E>, "magic_enum::customize invalid.");
}
}
@ -471,12 +490,14 @@ constexpr bool is_valid() noexcept {
#endif
[[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.");
if constexpr (std::is_same_v<std::decay_t<decltype(custom)>, customize::customize_t> && custom.index() == 0) {
constexpr auto name = std::get<string_view>(custom);
if constexpr (custom.first == customize::detail::customize_tag::custom_tag) {
constexpr auto name = custom.second;
static_assert(!name.empty(), "magic_enum::customize requires not empty string.");
return name.size() != 0;
} else {
} else if constexpr (custom.first == customize::detail::customize_tag::default_tag) {
return n<E, v>().size() != 0;
} else {
return false;
}
}