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random/unique_seed.hpp 更新

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bolero-MURAKAMI 2011-10-29 12:02:21 +09:00
parent 9d7eecc585
commit cf64e4c457
3 changed files with 75 additions and 17 deletions
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52
sprout/random/unique_seed.hpp
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@ -1,22 +1,56 @@
#ifndef SPROUT_RANDOM_UNIQUE_SEED_HPP
#define SPROUT_RANDOM_UNIQUE_SEED_HPP
#ifndef SPROUT_CONFIG_DISABLE_CONSTEXPR
# include <cstddef>
# include <type_traits>
#endif
#include <cstddef>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/array.hpp>
#include <sprout/functional/hash/hash.hpp>
#include <sprout/preprocessor/unique_string.hpp>
namespace sprout {
//
// make_seed
//
template<typename T>
SPROUT_CONSTEXPR std::size_t make_seed(T const& v) {
return sprout::to_hash(v);
}
namespace detail {
template<std::size_t N, typename T, typename... Args>
SPROUT_CONSTEXPR typename std::enable_if<
sizeof...(Args) + 1 == N,
sprout::array<std::size_t, N>
>::type make_seed_seq_impl(T const& v, std::size_t seed, Args const&... args) {
return sprout::array<std::size_t, N>{{args..., seed}};
}
template<std::size_t N, typename T, typename... Args>
SPROUT_CONSTEXPR typename std::enable_if<
sizeof...(Args) + 1 != N,
sprout::array<std::size_t, N>
>::type make_seed_seq_impl(T const& v, std::size_t seed, Args const&... args) {
return sprout::detail::make_seed_seq_impl<N>(v, sprout::hash_combine(seed, v), args..., seed);
}
} // namespace detail
//
// make_seed_seq
//
template<std::size_t N, typename T>
SPROUT_CONSTEXPR sprout::array<std::size_t, N> make_seed_seq(T const& v) {
return sprout::detail::make_seed_seq_impl<N>(v, sprout::to_hash(v));
}
} // namespace sprout
//
// SPROUT_UNIQUE_SEED
//
#ifndef SPROUT_CONFIG_DISABLE_CONSTEXPR
# define SPROUT_UNIQUE_SEED (::std::integral_constant< ::std::size_t, ::sprout::hash_value(SPROUT_PP_UNIQUE_STRING)>::value)
#else
# define SPROUT_UNIQUE_SEED (::sprout::hash_value(SPROUT_PP_UNIQUE_STRING))
#endif
#define SPROUT_UNIQUE_SEED (::sprout::make_seed(SPROUT_PP_UNIQUE_STRING))
//
// SPROUT_UNIQUE_SEED_SEQ
//
#define SPROUT_UNIQUE_SEED_SEQ(N) (::sprout::make_seed_seq<N>(SPROUT_PP_UNIQUE_STRING))
#endif // #ifndef SPROUT_RANDOM_UNIQUE_SEED_HPP