common/swap: use template and tag for LE/BE specification
The tag can be useful for other type-generic templates like BitFields to forward the endianness specification
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Weiyi Wang
fearlessTobi
parent
94bc48dd78
commit
6734c64976
1 changed files with 106 additions and 54 deletions
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@ -645,64 +645,116 @@ protected:
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}
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};
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struct SwapTag {}; // Use the different endianness from the system
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struct KeepTag {}; // Use the same endianness as the system
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template <typename T, typename Tag>
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struct AddEndian;
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// KeepTag specializations
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template <typename T>
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struct AddEndian<T, KeepTag> {
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using type = T;
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};
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// SwapTag specializations
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template <>
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struct AddEndian<u8, SwapTag> {
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using type = u8;
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};
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template <>
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struct AddEndian<u16, SwapTag> {
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using type = swap_struct_t<u16, swap_16_t<u16>>;
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};
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template <>
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struct AddEndian<u32, SwapTag> {
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using type = swap_struct_t<u32, swap_32_t<u32>>;
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};
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template <>
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struct AddEndian<u64, SwapTag> {
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using type = swap_struct_t<u64, swap_64_t<u64>>;
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};
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template <>
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struct AddEndian<s8, SwapTag> {
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using type = s8;
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};
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template <>
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struct AddEndian<s16, SwapTag> {
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using type = swap_struct_t<s16, swap_16_t<s16>>;
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};
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template <>
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struct AddEndian<s32, SwapTag> {
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using type = swap_struct_t<s32, swap_32_t<s32>>;
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};
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template <>
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struct AddEndian<s64, SwapTag> {
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using type = swap_struct_t<s64, swap_64_t<s64>>;
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};
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template <>
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struct AddEndian<float, SwapTag> {
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using type = swap_struct_t<float, swap_float_t<float>>;
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};
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template <>
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struct AddEndian<double, SwapTag> {
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using type = swap_struct_t<double, swap_double_t<double>>;
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};
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template <typename T>
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struct AddEndian<T, SwapTag> {
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static_assert(std::is_enum_v<T>);
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using type = swap_enum_t<T>;
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};
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// Alias LETag/BETag as KeepTag/SwapTag depending on the system
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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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using u64_le = u64;
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using s16_le = s16;
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using s32_le = s32;
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using s64_le = s64;
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using LETag = KeepTag;
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using BETag = SwapTag;
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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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using u64_be = swap_struct_t<u64, swap_64_t<u64>>;
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using s64_be = swap_struct_t<s64, swap_64_t<s64>>;
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using u32_be = swap_struct_t<u32, swap_32_t<u32>>;
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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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using u64_le = swap_struct_t<u64, swap_64_t<u64>>;
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using s64_le = swap_struct_t<s64, swap_64_t<s64>>;
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using u32_le = swap_struct_t<u32, swap_32_t<u32>>;
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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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using u16_be = u16;
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using u32_be = u32;
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using u64_be = u64;
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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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using BETag = KeepTag;
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using LETag = SwapTag;
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#endif
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// Aliases for LE types
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using u16_le = AddEndian<u16, LETag>::type;
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using u32_le = AddEndian<u32, LETag>::type;
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using u64_le = AddEndian<u64, LETag>::type;
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using s16_le = AddEndian<s16, LETag>::type;
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using s32_le = AddEndian<s32, LETag>::type;
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using s64_le = AddEndian<s64, LETag>::type;
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template <typename T>
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using enum_le = std::enable_if_t<std::is_enum_v<T>, typename AddEndian<T, LETag>::type>;
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using float_le = AddEndian<float, LETag>::type;
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using double_le = AddEndian<double, LETag>::type;
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// Aliases for BE types
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using u16_be = AddEndian<u16, BETag>::type;
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using u32_be = AddEndian<u32, BETag>::type;
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using u64_be = AddEndian<u64, BETag>::type;
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using s16_be = AddEndian<s16, BETag>::type;
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using s32_be = AddEndian<s32, BETag>::type;
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using s64_be = AddEndian<s64, BETag>::type;
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template <typename T>
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using enum_be = std::enable_if_t<std::is_enum_v<T>, typename AddEndian<T, BETag>::type>;
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using float_be = AddEndian<float, BETag>::type;
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using double_be = AddEndian<double, BETag>::type;
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