common/swap: add swap template for enum
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@ -17,6 +17,8 @@
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#pragma once
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#include <type_traits>
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#if defined(_MSC_VER)
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#include <cstdlib>
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#elif defined(__linux__)
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@ -605,6 +607,44 @@ struct swap_double_t {
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}
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};
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template <typename T>
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struct swap_enum_t {
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static_assert(std::is_enum_v<T>);
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using base = std::underlying_type_t<T>;
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public:
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swap_enum_t() = default;
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swap_enum_t(const T& v) : value(swap(v)) {}
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swap_enum_t& operator=(const T& v) {
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value = swap(v);
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return *this;
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}
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operator T() const {
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return swap(value);
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}
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explicit operator base() const {
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return static_cast<base>(swap(value));
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}
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protected:
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T value{};
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// clang-format off
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using swap_t = std::conditional_t<
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std::is_same_v<base, u16>, swap_16_t<u16>, std::conditional_t<
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std::is_same_v<base, s16>, swap_16_t<s16>, std::conditional_t<
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std::is_same_v<base, u32>, swap_32_t<u32>, std::conditional_t<
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std::is_same_v<base, s32>, swap_32_t<s32>, std::conditional_t<
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std::is_same_v<base, u64>, swap_64_t<u64>, std::conditional_t<
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std::is_same_v<base, s64>, swap_64_t<s64>, void>>>>>>;
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// clang-format on
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static T swap(T x) {
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return static_cast<T>(swap_t::swap(static_cast<base>(x)));
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}
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};
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#if COMMON_LITTLE_ENDIAN
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using u16_le = u16;
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using u32_le = u32;
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@ -614,6 +654,9 @@ using s16_le = s16;
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using s32_le = s32;
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using s64_le = s64;
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template <typename T>
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using enum_le = std::enable_if_t<std::is_enum_v<T>, T>;
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using float_le = float;
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using double_le = double;
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@ -626,6 +669,9 @@ using s32_be = swap_struct_t<s32, swap_32_t<s32>>;
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using u16_be = swap_struct_t<u16, swap_16_t<u16>>;
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using s16_be = swap_struct_t<s16, swap_16_t<s16>>;
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template <typename T>
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using enum_be = swap_enum_t<T>;
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using float_be = swap_struct_t<float, swap_float_t<float>>;
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using double_be = swap_struct_t<double, swap_double_t<double>>;
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#else
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@ -639,6 +685,9 @@ using s32_le = swap_struct_t<s32, swap_32_t<s32>>;
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using u16_le = swap_struct_t<u16, swap_16_t<u16>>;
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using s16_le = swap_struct_t<s16, swap_16_t<s16>>;
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template <typename T>
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using enum_le = swap_enum_t<T>;
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using float_le = swap_struct_t<float, swap_float_t<float>>;
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using double_le = swap_struct_t<double, swap_double_t<double>>;
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@ -650,6 +699,9 @@ using s16_be = s16;
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using s32_be = s32;
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using s64_be = s64;
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template <typename T>
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using enum_be = std::enable_if_t<std::is_enum_v<T>, T>;
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using float_be = float;
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using double_be = double;
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