mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2016 Bolero MURAKAMI
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
|
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
=============================================================================*/
|
|
#ifndef SPROUT_RANDOM_UNIQUE_SEED_HPP
|
|
#define SPROUT_RANDOM_UNIQUE_SEED_HPP
|
|
|
|
#include <cstdint>
|
|
#include <type_traits>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/workaround/std/cstddef.hpp>
|
|
#include <sprout/array/array.hpp>
|
|
#include <sprout/functional/hash.hpp>
|
|
#include <sprout/preprocessor/unique_string.hpp>
|
|
|
|
namespace sprout {
|
|
//
|
|
// make_seed
|
|
//
|
|
template<typename T>
|
|
SPROUT_CONSTEXPR std::uint_least32_t
|
|
make_seed(T const& v) {
|
|
return static_cast<std::uint_least32_t>(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::uint_least32_t, N>
|
|
>::type
|
|
make_seed_seq_impl(T const&, std::size_t seed, Args const&... args) {
|
|
return sprout::array<std::uint_least32_t, N>{{args..., static_cast<std::uint_least32_t>(seed)}};
|
|
}
|
|
template<std::size_t N, typename T, typename... Args>
|
|
SPROUT_CONSTEXPR typename std::enable_if<
|
|
sizeof...(Args) + 1 != N,
|
|
sprout::array<std::uint_least32_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..., static_cast<std::uint_least32_t>(seed));
|
|
}
|
|
} // namespace detail
|
|
//
|
|
// make_seed_seq
|
|
//
|
|
template<std::size_t N, typename T>
|
|
SPROUT_CONSTEXPR sprout::array<std::uint_least32_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
|