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https://github.com/bolero-MURAKAMI/Sprout.git
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55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
#ifndef SPROUT_RANDOM_UNIQUE_SEED_HPP
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#define SPROUT_RANDOM_UNIQUE_SEED_HPP
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#include <cstddef>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/array.hpp>
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#include <sprout/functional/hash/hash.hpp>
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#include <sprout/preprocessor/unique_string.hpp>
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namespace sprout {
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//
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// make_seed
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//
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template<typename T>
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SPROUT_CONSTEXPR std::size_t make_seed(T const& v) {
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return sprout::to_hash(v);
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}
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namespace detail {
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template<std::size_t N, typename T, typename... Args>
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SPROUT_CONSTEXPR typename std::enable_if<
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sizeof...(Args) + 1 == N,
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sprout::array<std::size_t, N>
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>::type make_seed_seq_impl(T const& v, std::size_t seed, Args const&... args) {
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return sprout::array<std::size_t, N>{{args..., seed}};
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}
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template<std::size_t N, typename T, typename... Args>
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SPROUT_CONSTEXPR typename std::enable_if<
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sizeof...(Args) + 1 != N,
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sprout::array<std::size_t, N>
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>::type make_seed_seq_impl(T const& v, std::size_t seed, Args const&... args) {
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return sprout::detail::make_seed_seq_impl<N>(v, sprout::hash_combine(seed, v), args..., seed);
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}
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} // namespace detail
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//
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// make_seed_seq
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//
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template<std::size_t N, typename T>
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SPROUT_CONSTEXPR sprout::array<std::size_t, N> make_seed_seq(T const& v) {
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return sprout::detail::make_seed_seq_impl<N>(v, sprout::to_hash(v));
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}
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} // namespace sprout
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//
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// SPROUT_UNIQUE_SEED
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//
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#define SPROUT_UNIQUE_SEED (::sprout::make_seed(SPROUT_PP_UNIQUE_STRING))
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//
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// SPROUT_UNIQUE_SEED_SEQ
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//
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#define SPROUT_UNIQUE_SEED_SEQ(N) (::sprout::make_seed_seq<N>(SPROUT_PP_UNIQUE_STRING))
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#endif // #ifndef SPROUT_RANDOM_UNIQUE_SEED_HPP
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