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bolero-MURAKAMI 2011-09-29 22:46:32 +09:00
parent 305ae86d92
commit 4a345e8259
6 changed files with 544 additions and 8 deletions
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63
sprout/random/detail/signed_unsigned_tools.hpp Normal file
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#ifndef SPROUT_RANDOM_DETAIL_SIGNED_UNSIGNED_TOOLS_HPP
#define SPROUT_RANDOM_DETAIL_SIGNED_UNSIGNED_TOOLS_HPP
#include <limits>
#include <type_traits>
#include <sprout/config.hpp>
namespace sprout {
namespace random {
namespace detail {
template<typename T, bool B = std::numeric_limits<T>::is_signed>
struct subtract {};
template<typename T>
struct subtract<T, false> {
public:
typedef T result_type;
public:
SPROUT_CONSTEXPR result_type operator()(T x, T y) const {
return x - y;
}
};
template<typename T>
struct subtract<T, true> {
public:
typedef typename std::make_unsigned<T>::type result_type;
public:
SPROUT_CONSTEXPR result_type operator()(T x, T y) const {
return y >= 0 ? result_type(x) - result_type(y)
: x >= 0 ? result_type(x) + result_type(-(y + 1)) + 1
: result_type(x - y)
;
}
};
template<typename T1, typename T2, bool B = std::numeric_limits<T2>::is_signed>
struct add {};
template<typename T1, typename T2>
struct add<T1, T2, false> {
public:
typedef T2 result_type;
public:
SPROUT_CONSTEXPR result_type operator()(T1 x, T2 y) const {
return T2(x) + y;
}
};
template<typename T1, typename T2>
struct add<T1, T2, true> {
public:
typedef T2 result_type;
public:
SPROUT_CONSTEXPR result_type operator()(T1 x, T2 y) const {
return y >= 0 ? T2(x) + y
: x >= T1(-(y + 1)) ? T2(x - T1(-(y + 1)) - 1)
: T2(x) + y
;
}
};
} // namespace detail
} // namespace random
} // namespace sprout
#endif // SPROUT_RANDOM_DETAIL_SIGNED_UNSIGNED_TOOLS_HPP