Emily Boudreaux
ec13264050
A bug was discovered in glaze which prevented valid toml output. We have switched to toml++ and reflect-cpp. The interface has remained the same so this should not break any code
63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
#pragma once
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#include "../common.hpp"
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#include <array>
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#include <climits>
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#include <cstddef>
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#include <type_traits>
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namespace enchantum::details {
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template<typename E, typename = void>
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inline constexpr std::size_t prefix_length_or_zero = 0;
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template<typename E>
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inline constexpr auto prefix_length_or_zero<E, decltype((void)enum_traits<E>::prefix_length)> = std::size_t{
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enum_traits<E>::prefix_length};
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template<typename Enum, auto Min, decltype(Min) Max>
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constexpr auto generate_arrays()
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{
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#if defined __clang__ && __clang_major__ >= 20
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if constexpr (BitFlagEnum<Enum>) {
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if constexpr (EnumFixedUnderlying<Enum>) {
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constexpr std::size_t bits = sizeof(Enum) * CHAR_BIT;
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std::array<Enum, bits + 1> ret{}; // 0 value reflected
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for (std::size_t i = 0; i < bits; ++i)
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ret[i + 1] = static_cast<Enum>(static_cast<std::make_unsigned_t<std::underlying_type_t<Enum>>>(1) << i);
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return ret;
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}
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else {
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constexpr auto bits =
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[]() {
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auto copy = (Max > Min ? Max - Min : Min - Max); // handle negative;
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std::size_t count = 0;
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do
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++count;
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while (copy >>= 1);
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return count;
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}();
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std::array<Enum, bits + 1> b{}; // 0 value reflected
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for (std::size_t i = 0; i < bits; ++i)
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b[i + 1] = static_cast<Enum>(static_cast<std::make_unsigned_t<std::underlying_type_t<Enum>>>(1) << i);
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return b;
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}
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}
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#else
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if constexpr (BitFlagEnum<Enum>) {
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constexpr std::size_t bits = sizeof(Enum) * CHAR_BIT;
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std::array<Enum, bits + 1> ret{}; // 0 value reflected
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for (std::size_t i = 0; i < bits; ++i)
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ret[i + 1] = static_cast<Enum>(static_cast<std::make_unsigned_t<std::underlying_type_t<Enum>>>(1) << i);
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return ret;
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}
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#endif
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else {
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static_assert(Min < Max, "enum_traits::min must be less than enum_traits::max");
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std::array<Enum, (Max - Min) + 1> array;
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auto* const array_data = array.data();
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for (std::size_t i = 0, size = array.size(); i < size; ++i)
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array_data[i] = static_cast<Enum>(static_cast<decltype(Min)>(i) + Min);
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return array;
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}
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}
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} // namespace enchantum::details
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