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add constexpr containers (#187)

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Bela Schaum 2023-01-17 15:59:37 +01:00 • committed by GitHub
parent 2a7658d084
commit 533c9509ef
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10 changed files with 2609 additions and 7 deletions
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11
include/magic_enum.hpp
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@ -38,8 +38,8 @@
#include <array>
#include <cassert>
#include <cstdint>
#include <cstddef>
#include <cstdint>
#include <limits>
#include <type_traits>
#include <utility>
@ -281,6 +281,7 @@ constexpr string_view pretty_name(string_view name) noexcept {
return {}; // Invalid name.
}
template<typename Op = std::equal_to<>>
class case_insensitive {
static constexpr char to_lower(char c) noexcept {
return (c >= 'A' && c <= 'Z') ? static_cast<char>(c + ('a' - 'A')) : c;
@ -293,7 +294,7 @@ class case_insensitive {
static_assert(always_false_v<L, R>, "magic_enum::case_insensitive not supported Non-ASCII feature.");
return false;
#else
return to_lower(lhs) == to_lower(rhs);
return Op{}(to_lower(lhs), to_lower(rhs));
#endif
}
};
@ -1107,7 +1108,7 @@ template <typename E>
// Obtains index in enum values from enum value.
// Returns optional with index.
template <typename E>
[[nodiscard]] constexpr auto enum_index(E value) noexcept -> detail::enable_if_t<E, optional<std::size_t>> {
[[nodiscard]] constexpr auto enum_index([[maybe_unused]] E value) noexcept -> detail::enable_if_t<E, optional<std::size_t>> {
using D = std::decay_t<E>;
using U = underlying_type_t<D>;
@ -1216,7 +1217,7 @@ template <detail::value_type VT, typename E>
// Returns name from enum-flags value.
// If enum-flags value does not have name or value out of range, returns empty string.
template <typename E>
[[nodiscard]] auto enum_flags_name(E value) -> detail::enable_if_t<E, string> {
[[nodiscard]] auto enum_flags_name(E value, [[maybe_unused]] char sep = '|') -> detail::enable_if_t<E, string> {
using D = std::decay_t<E>;
static_assert(detail::is_flags_v<D>, "magic_enum::enum_flags_name requires enum-flags type.");
@ -1236,7 +1237,7 @@ template <typename E>
}
// Allows you to write magic_enum::enum_cast<foo>("bar", magic_enum::case_insensitive);
inline constexpr auto case_insensitive = detail::case_insensitive{};
inline constexpr auto case_insensitive = detail::case_insensitive<>{};
// Obtains enum value from integer value.
// Returns optional with enum value.