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add floating point functions: float_pair, float_exponent, float_mantissa

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bolero-MURAKAMI 2013-02-07 19:26:24 +09:00
commit 63ef07d124
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47
sprout/math/float_pair.hpp Normal file
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#ifndef SPROUT_MATH_FLOAT_PAIR_HPP
#define SPROUT_MATH_FLOAT_PAIR_HPP
#include <cfloat>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/math/detail/config.hpp>
#include <sprout/detail/pow.hpp>
#include <sprout/math/float_exponent.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#include <sprout/utility/pair.hpp>
namespace sprout {
namespace math {
namespace detail {
template<typename T>
inline SPROUT_CONSTEXPR sprout::pair<T, int>
float_pair_impl(T x, int exp) {
return sprout::pair<T, int>(x / sprout::detail::pow_n(T(FLT_RADIX), exp), exp);
}
template<
typename FloatType,
typename sprout::enabler_if<std::is_floating_point<FloatType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR sprout::pair<FloatType, int>
float_pair(FloatType x) {
return sprout::math::detail::float_pair_impl(x, sprout::math::float_exponent(x));
}
template<
typename IntType,
typename sprout::enabler_if<std::is_integral<IntType>::value>::type = sprout::enabler
>
inline SPROUT_CONSTEXPR sprout::pair<double, int>
float_pair(IntType x) {
return sprout::math::detail::float_pair(static_cast<double>(x));
}
} // namespace detail
using sprout::math::detail::float_pair;
} // namespace math
using sprout::math::float_pair;
} // namespace sprout
#endif // #ifndef SPROUT_MATH_FLOAT_PAIR_HPP