isnan.hpp

Go to the documentation of this file.

/*=============================================================================
  Copyright (C) 2015-2017 DxLibEx project
  https://github.com/Nagarei/DxLibEx/

  Distributed under the Boost Software License, Version 1.0.
  (See http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#ifndef DXLE_INC_MATH_ISNAN_HPP_
#define DXLE_INC_MATH_ISNAN_HPP_
#include "dxlibex/config/defines.h"
#include <cmath>
#include "dxlibex/config/defines.h"
#include "dxlibex/type_traits.hpp"
#ifdef DXLE_NO_CXX11_CONSTEXPR
namespace dxle{
    namespace math{
        using std::isnan;
    }
    using dxle::math::isnan;
}
#else //DXLE_NO_CXX11_CONSTEXPR
namespace dxle {
    namespace math {
        template<typename FloatType, enable_if_t<std::is_floating_point<FloatType>::value, std::nullptr_t> = nullptr>
        inline DXLE_CONSTEXPR bool isnan(FloatType x) DXLE_NOEXCEPT_OR_NOTHROW {    return !(x == x); }
        template<typename IntType, enable_if_t<std::is_integral<IntType>::value> = nullptr>
        inline DXLE_CONSTEXPR bool isnan(IntType) DXLE_NOEXCEPT_OR_NOTHROW { return false; }
    }   // namespace math

    using dxle::math::isnan;
}
#endif //DXLE_NO_CXX11_CONSTEXPR
#endif //DXLE_INC_MATH_ISNAN_HPP_