104 lines
2.8 KiB
C++
104 lines
2.8 KiB
C++
/* Type limits for OctaSTD.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OSTD_LIMITS_HH
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#define OSTD_LIMITS_HH
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#include <limits.h>
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#include <float.h>
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#include "ostd/types.hh"
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#include "ostd/type_traits.hh"
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namespace ostd {
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namespace detail {
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template<typename T, bool I = IsIntegral<T>, bool F = IsFloatingPoint<T>>
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struct NumericLimitsBase {
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static constexpr T minv = T{};
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static constexpr T maxv = T{};
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static constexpr T lowv = T{};
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static constexpr bool is_signed = false;
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static constexpr bool is_integer = false;
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};
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/* signed integer types */
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template<typename T, bool S = IsSigned<T>>
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struct IntegerLimitsBase {
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using UT = MakeUnsigned<T>;
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static constexpr T minv = -(~(1ULL << (sizeof(T) * CHAR_BIT - 1))) - 1;
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static constexpr T maxv = T(UT(~UT(0)) >> 1);
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static constexpr T lowv = minv;
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static constexpr bool is_signed = true;
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static constexpr bool is_integer = true;
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};
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/* unsigned integer types */
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template<typename T>
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struct IntegerLimitsBase<T, false> {
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static constexpr T minv = T(0);
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static constexpr T maxv = ~T(0);
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static constexpr T lowv = minv;
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static constexpr bool is_signed = false;
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static constexpr bool is_integer = true;
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};
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/* all integer types */
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template<typename T>
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struct NumericLimitsBase<T, true, false>: IntegerLimitsBase<T> {};
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/* floating point types */
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template<typename T>
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struct FloatLimitsBase;
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template<>
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struct FloatLimitsBase<float> {
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static constexpr float minv = FLT_MIN;
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static constexpr float maxv = FLT_MAX;
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static constexpr float lowv = -maxv;
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};
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template<>
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struct FloatLimitsBase<double> {
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static constexpr double minv = DBL_MIN;
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static constexpr double maxv = DBL_MAX;
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static constexpr double lowv = -maxv;
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};
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template<>
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struct FloatLimitsBase<long double> {
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static constexpr long double minv = LDBL_MIN;
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static constexpr long double maxv = LDBL_MAX;
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static constexpr long double lowv = -maxv;
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};
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template<typename T>
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struct NumericLimitsBase<T, false, true>: FloatLimitsBase<T> {
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static constexpr bool is_signed = true;
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static constexpr bool is_integer = false;
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};
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}
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template<typename T>
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constexpr T NumericLimitMin = detail::NumericLimitsBase<T>::minv;
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template<typename T>
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constexpr T NumericLimitMax = detail::NumericLimitsBase<T>::maxv;
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template<typename T>
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constexpr T NumericLimitLowest = detail::NumericLimitsBase<T>::lowv;
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template<typename T>
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constexpr bool NumericLimitIsSigned = detail::NumericLimitsBase<T>::is_signed;
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template<typename T>
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constexpr bool NumericLimitIsInteger = detail::NumericLimitsBase<T>::is_integer;
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}
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#endif
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