mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-23 21:25:49 +00:00
56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
#ifndef SPROUT_RANDOM_UNIQUE_SEED_HPP
|
|
#define SPROUT_RANDOM_UNIQUE_SEED_HPP
|
|
|
|
#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
|
|
//
|
|
#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
|
|
|