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Implement umax global variable (max unsigned value)

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Implements operators == and != comparisons.
This commit is contained in:
Nekotekina 2020-02-19 19:34:04 +03:00
parent 70bcb1cd52
commit 0cf35e3b22
1 changed files with 42 additions and 0 deletions
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42
Utilities/types.h
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@ -409,6 +409,48 @@ struct alignas(16) s128
CHECK_SIZE_ALIGN(u128, 16, 16);
CHECK_SIZE_ALIGN(s128, 16, 16);
// Return magic value for any unsigned type
constexpr inline struct umax_helper
{
constexpr umax_helper() noexcept = default;
template <typename T, typename S = simple_t<std::decay_t<T>>, typename = std::enable_if_t<std::is_unsigned_v<S>>>
explicit constexpr operator T() const
{
return std::numeric_limits<S>::max();
}
template <typename T, typename S = simple_t<std::decay_t<T>>, typename = std::enable_if_t<std::is_unsigned_v<S>>>
constexpr bool operator==(const T& rhs) const
{
return rhs == std::numeric_limits<simple_t<std::decay_t<T>>>::max();
}
#if __cpp_impl_three_way_comparison >= 201711 && !__INTELLISENSE__
#else
template <typename T>
friend constexpr std::enable_if_t<std::is_unsigned_v<simple_t<std::decay_t<T>>>, bool> operator==(const T& lhs, const umax_helper& rhs)
{
return rhs == lhs;
}
#endif
#if __cpp_impl_three_way_comparison >= 201711
#else
template <typename T, typename S = simple_t<std::decay_t<T>>, typename = std::enable_if_t<std::is_unsigned_v<S>>>
constexpr bool operator!=(const T& rhs) const
{
return rhs != std::numeric_limits<simple_t<std::decay_t<T>>>::max();
}
template <typename T>
friend constexpr std::enable_if_t<std::is_unsigned_v<simple_t<std::decay_t<T>>>, bool> operator!=(const T& lhs, const umax_helper& rhs)
{
return rhs != lhs;
}
#endif
} umax;
using f32 = float;
using f64 = double;