mirror of https://github.com/axmolengine/axmol.git
68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
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#ifndef AL_BYTE_H
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#define AL_BYTE_H
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#include <cstddef>
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#include <cstdint>
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#include <limits>
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#include <type_traits>
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using uint = unsigned int;
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namespace al {
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/* The "canonical" way to store raw byte data. Like C++17's std::byte, it's not
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* treated as a character type and does not work with arithmatic ops. Only
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* bitwise ops are allowed.
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*/
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enum class byte : unsigned char { };
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template<typename T>
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constexpr std::enable_if_t<std::is_integral<T>::value,T>
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to_integer(al::byte b) noexcept { return T(b); }
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template<typename T>
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constexpr std::enable_if_t<std::is_integral<T>::value,al::byte>
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operator<<(al::byte lhs, T rhs) noexcept { return al::byte(to_integer<uint>(lhs) << rhs); }
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template<typename T>
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constexpr std::enable_if_t<std::is_integral<T>::value,al::byte>
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operator>>(al::byte lhs, T rhs) noexcept { return al::byte(to_integer<uint>(lhs) >> rhs); }
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template<typename T>
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constexpr std::enable_if_t<std::is_integral<T>::value,al::byte&>
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operator<<=(al::byte &lhs, T rhs) noexcept { lhs = lhs << rhs; return lhs; }
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template<typename T>
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constexpr std::enable_if_t<std::is_integral<T>::value,al::byte&>
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operator>>=(al::byte &lhs, T rhs) noexcept { lhs = lhs >> rhs; return lhs; }
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#define AL_DECL_OP(op, opeq) \
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template<typename T> \
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constexpr std::enable_if_t<std::is_integral<T>::value,al::byte> \
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operator op (al::byte lhs, T rhs) noexcept \
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{ return al::byte(to_integer<uint>(lhs) op static_cast<uint>(rhs)); } \
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\
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template<typename T> \
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constexpr std::enable_if_t<std::is_integral<T>::value,al::byte&> \
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operator opeq (al::byte &lhs, T rhs) noexcept { lhs = lhs op rhs; return lhs; } \
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\
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constexpr al::byte operator op (al::byte lhs, al::byte rhs) noexcept \
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{ return al::byte(lhs op to_integer<uint>(rhs)); } \
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\
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constexpr al::byte& operator opeq (al::byte &lhs, al::byte rhs) noexcept \
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{ lhs = lhs op rhs; return lhs; }
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AL_DECL_OP(|, |=)
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AL_DECL_OP(&, &=)
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AL_DECL_OP(^, ^=)
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#undef AL_DECL_OP
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constexpr al::byte operator~(al::byte b) noexcept
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{ return al::byte(~to_integer<uint>(b)); }
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} // namespace al
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#endif /* AL_BYTE_H */
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