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fix random_result<E, D>::next_generator(): returns variate_generator<E, D>

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This commit is contained in:
bolero-MURAKAMI 2014-01-15 00:06:38 +09:00
parent 6e5004b6f4
commit 406a1ff789
8 changed files with 242 additions and 98 deletions
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49
sprout/random/generate_array.hpp
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@ -12,16 +12,18 @@
#include <sprout/config.hpp>
#include <sprout/array/array.hpp>
#include <sprout/utility/pair/pair.hpp>
#include <sprout/generator/functions.hpp>
#include <sprout/generator/results.hpp>
namespace sprout {
namespace random {
//
// generate_array
//
template<std::size_t N, typename URNG>
inline SPROUT_CXX14_CONSTEXPR sprout::array<typename URNG::result_type, N>
generate_array(URNG& rng) {
sprout::array<typename URNG::result_type, N> result{{}};
template<std::size_t N, typename RandomNumberGenerator>
inline SPROUT_CXX14_CONSTEXPR sprout::array<typename RandomNumberGenerator::result_type, N>
generate_array(RandomNumberGenerator& rng) {
sprout::array<typename RandomNumberGenerator::result_type, N> result{{}};
for (std::size_t i = 0; i != N; ++i) {
result[i] = rng();
}
@ -29,32 +31,47 @@ namespace sprout {
}
namespace detail {
template<std::size_t N, typename URNG, typename Random, typename... Args>
template<std::size_t N, typename RandomNumberGenerator, typename Random, typename... Args>
static SPROUT_CONSTEXPR typename std::enable_if<
(sizeof...(Args) + 1 == N),
sprout::pair<sprout::array<typename URNG::result_type, N>, URNG> const
sprout::pair<
sprout::array<typename sprout::generators::results::generated_value<RandomNumberGenerator const>::type, N>,
typename sprout::generators::results::next_generator<RandomNumberGenerator const>::type
> const
>::type generate_array_impl(Random const& rnd, Args const&... args) {
typedef sprout::pair<sprout::array<typename URNG::result_type, N>, URNG> const pair_type;
typedef sprout::pair<
sprout::array<typename sprout::generators::results::generated_value<RandomNumberGenerator const>::type, N>,
typename sprout::generators::results::next_generator<RandomNumberGenerator const>::type
> const pair_type;
return pair_type{
sprout::array<typename URNG::result_type, N>{{args..., rnd.result()}},
rnd.engine()
sprout::array<typename RandomNumberGenerator::result_type, N>{{args..., sprout::generators::generated_value(rnd)}},
sprout::generators::next_generator(rnd)
};
}
template<std::size_t N, typename URNG, typename Random, typename... Args>
template<std::size_t N, typename RandomNumberGenerator, typename Random, typename... Args>
static SPROUT_CONSTEXPR typename std::enable_if<
(sizeof...(Args) + 1 < N),
sprout::pair<sprout::array<typename URNG::result_type, N>, URNG> const
sprout::pair<
sprout::array<typename sprout::generators::results::generated_value<RandomNumberGenerator const>::type, N>,
typename sprout::generators::results::next_generator<RandomNumberGenerator const>::type
> const
>::type generate_array_impl(Random const& rnd, Args const&... args) {
return sprout::random::detail::generate_array_impl<N, URNG>(rnd(), args..., rnd.result());
return sprout::random::detail::generate_array_impl<N, RandomNumberGenerator>(
sprout::generators::next_generator(rnd)(),
args..., sprout::generators::generated_value(rnd)
);
}
} // namespace detail
//
// generate_array
//
template<std::size_t N, typename URNG>
inline SPROUT_CONSTEXPR sprout::pair<sprout::array<typename URNG::result_type, N>, URNG> const
generate_array(URNG const& rng) {
return sprout::random::detail::generate_array_impl<N, URNG>(rng());
template<std::size_t N, typename RandomNumberGenerator>
inline SPROUT_CONSTEXPR sprout::pair<
sprout::array<typename sprout::generators::results::generated_value<RandomNumberGenerator const>::type, N>,
typename sprout::generators::results::next_generator<RandomNumberGenerator const>::type
> const
generate_array(RandomNumberGenerator const& rng) {
return sprout::random::detail::generate_array_impl<N, RandomNumberGenerator>(rng());
}
} // namespace random
} // namespace sprout