131 lines
4.5 KiB
C++
131 lines
4.5 KiB
C++
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/***
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Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: auNumericLimits.hpp
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Date: 2022-2-19
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Author: Reece
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***/
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#pragma once
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template <class T, T Min, T Max, T Epsilon, bool IsSigned = false, bool IsInteger = false>
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struct _AuNonStdLimits
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{
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using Type = T;
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static const bool is_signed = IsSigned;
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static const bool is_integer = IsInteger;
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static constexpr Type min()
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{
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return Min;
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}
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static constexpr Type max()
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{
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return Max;
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}
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static constexpr Type epsilon()
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{
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return Epsilon;
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}
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};
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template <class T>
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struct AuNumericLimits;
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#define _AU_LIMITS_ADD(bits) \
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\
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template <> \
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struct AuNumericLimits<AuUInt ## bits> : _AuNonStdLimits<AuUInt ## bits, 0, static_cast<AuUInt ## bits>(AuInt ## bits(-1)), 1, false, true> \
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{ \
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\
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}; \
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\
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template <> \
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struct AuNumericLimits<AuInt ## bits> : _AuNonStdLimits<AuInt ## bits, AuInt ## bits(AuUInt ## bits(0) - AuInt ## bits(AuConstPow<AuUInt ## bits>(2, bits - 1) - 1)) - 1, AuInt ## bits(AuConstPow<AuUInt ## bits>(2, bits - 1) - 1), 1, true, true> \
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{ \
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\
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};
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_AU_LIMITS_ADD(8)
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_AU_LIMITS_ADD(16)
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_AU_LIMITS_ADD(32)
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_AU_LIMITS_ADD(64)
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#undef _AU_LIMITS_ADD
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#if defined(AURORA_COMPILER_MSVC)
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template <>
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struct AuNumericLimits<long> : AuNumericLimits<int>
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{};
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template <>
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struct AuNumericLimits<unsigned long> : AuNumericLimits<unsigned int>
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{};
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#endif
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// TODO: clang x86 and x64 will need different hacks for [unsigned] long long
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template <>
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struct AuNumericLimits<bool> : _AuNonStdLimits<bool, false, true, true>
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{};
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template <>
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struct AuNumericLimits<char16_t> : AuNumericLimits<AuUInt16>
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{};
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template <>
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struct AuNumericLimits<char32_t> : AuNumericLimits<AuUInt32>
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{};
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template <class T>
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struct _AuNonStdLimitsFP
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{
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using Type = T;
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static const bool is_signed = true;
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static const bool is_integer = false;
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};
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template <>
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struct AuNumericLimits<float> : _AuNonStdLimitsFP<float>
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{
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static double max()
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{
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return 340282346638528859811704183484516925440.0000000000000000;
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}
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static double min()
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{
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return -340282346638528859811704183484516925440.0000000000000000;
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}
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static constexpr double epsilon()
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{
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return 0.000000000000000111;
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}
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};
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template <>
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struct AuNumericLimits<double> : _AuNonStdLimitsFP<double>
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{
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static double max()
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{
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return 1.7976931348623157e+308;
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}
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static double min()
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{
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return -2.2250738585072014e-308;
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}
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static constexpr double epsilon()
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{
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return 0.000000000000000111;
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}
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};
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