mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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84 lines
2.9 KiB
C++
84 lines
2.9 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP
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#define SPROUT_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP
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#include <cstdint>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/limits.hpp>
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#include <sprout/random/random_result.hpp>
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#include <sprout/random/detail/generator_bits.hpp>
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#include <sprout/random/results.hpp>
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#include <sprout/detail/integer.hpp>
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#include HDR_ALGORITHM_MIN_MAX_SSCRISK_CEL_OR_SPROUT
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namespace sprout {
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namespace random {
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namespace detail {
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template<typename URNG>
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class uniform_int_float {
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public:
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typedef URNG base_type;
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typedef typename base_type::result_type base_result;
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typedef typename sprout::detail::uint_t<
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(sprout::numeric_limits<std::uintmax_t>::digits < sprout::numeric_limits<base_result>::digits)
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? sprout::numeric_limits<std::uintmax_t>::digits
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: sprout::numeric_limits<base_result>::digits
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>::fast result_type;
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private:
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base_type rng_;
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private:
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SPROUT_CONSTEXPR sprout::random::random_result<uniform_int_float> generate(
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sprout::random::random_result<base_type> const& rnd
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) const
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{
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return sprout::random::random_result<uniform_int_float>(
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static_cast<result_type>(sprout::random::result(rnd) * (static_cast<base_result>(max()) + 1)),
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uniform_int_float(sprout::random::next(rnd))
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);
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}
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public:
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SPROUT_CONSTEXPR uniform_int_float()
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: rng_()
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{}
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explicit SPROUT_CONSTEXPR uniform_int_float(base_type const& rng)
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: rng_(rng)
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{}
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SPROUT_CONSTEXPR result_type min() const {
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return 0;
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}
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SPROUT_CONSTEXPR result_type max() const {
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return (
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result_type(2) << (
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NS_SSCRISK_CEL_OR_SPROUT::min(
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sprout::numeric_limits<result_type>::digits,
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sprout::random::detail::generator_bits<base_type>::value()
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) - 1
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)
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) - 1
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;
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}
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base_type& base() {
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return rng_;
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}
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SPROUT_CONSTEXPR base_type const& base() const {
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return rng_;
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}
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SPROUT_CXX14_CONSTEXPR result_type operator()() {
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return static_cast<result_type>(static_cast<base_result>(rng_()) * static_cast<base_result>(max()) + 1);
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}
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SPROUT_CONSTEXPR sprout::random::random_result<uniform_int_float> const operator()() const {
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return generate(rng_());
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}
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};
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} // namespace detail
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} // namespace random
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} // namespace sprout
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#endif // #ifndef SPROUT_RANDOM_DETAIL_UNIFORM_INT_FLOAT_HPP
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