mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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74 lines
2.9 KiB
C++
74 lines
2.9 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2016 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_ITERATOR_HPP
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#define SPROUT_RANDOM_ITERATOR_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/iterator/generator_iterator.hpp>
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#include <sprout/type_traits/enabler_if.hpp>
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namespace sprout {
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namespace random {
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//
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// begin
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//
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template<
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typename Engine, typename Distribution,
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typename sprout::enabler_if<!std::is_integral<Distribution>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR auto
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begin(
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Engine const& engine, Distribution const& distribution,
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typename sprout::generator_iterator<typename std::remove_reference<decltype(distribution(engine))>::type>::difference_type count = -1
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)
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-> sprout::generator_iterator<typename std::remove_reference<decltype(distribution(engine))>::type>
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{
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return count >= 0
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? sprout::generator_iterator<typename std::remove_reference<decltype(distribution(engine))>::type>(distribution(engine), count)
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: sprout::generator_iterator<typename std::remove_reference<decltype(distribution(engine))>::type>(distribution(engine))
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;
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}
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template<typename Engine>
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inline SPROUT_CONSTEXPR auto
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begin(
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Engine const& engine,
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typename sprout::generator_iterator<typename std::remove_reference<decltype(engine())>::type>::difference_type count = -1
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)
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-> sprout::generator_iterator<typename std::remove_reference<decltype(engine())>::type>
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{
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return count >= 0
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? sprout::generator_iterator<typename std::remove_reference<decltype(engine())>::type>(engine(), count)
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: sprout::generator_iterator<typename std::remove_reference<decltype(engine())>::type>(engine())
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;
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}
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//
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// end
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//
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template<
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typename Engine, typename Distribution,
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typename sprout::enabler_if<!std::is_integral<Distribution>::value>::type = sprout::enabler
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>
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inline SPROUT_CONSTEXPR auto
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end(Engine const& engine, Distribution const& distribution)
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-> sprout::generator_iterator<typename std::remove_reference<decltype(distribution(engine))>::type>
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{
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return sprout::generator_iterator<typename std::remove_reference<decltype(distribution(engine))>::type>();
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}
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template<typename Engine>
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inline SPROUT_CONSTEXPR auto
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end(Engine const& engine)
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-> sprout::generator_iterator<typename std::remove_reference<decltype(engine())>::type>
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{
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return sprout::generator_iterator<typename std::remove_reference<decltype(engine())>::type>();
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}
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} // namespace random
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} // namespace sprout
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#endif // #ifndef SPROUT_RANDOM_ITERATOR_HPP
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