mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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91 lines
3 KiB
C++
91 lines
3 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2019 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_RANGE_ADAPTOR_SIZED_HPP
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#define SPROUT_RANGE_ADAPTOR_SIZED_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/container/traits.hpp>
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#include <sprout/container/functions.hpp>
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#include <sprout/range/adaptor/detail/sized_range_default.hpp>
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#include <sprout/type_traits/integral_constant.hpp>
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#include <sprout/type_traits/lvalue_reference.hpp>
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#include <sprout/utility/forward.hpp>
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#include <sprout/utility/lvalue_forward.hpp>
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namespace sprout {
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namespace adaptors {
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//
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// sized_range
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//
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template<typename Range, typename sprout::container_traits<Range>::size_type Size>
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class sized_range
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: public sprout::adaptors::detail::sized_range_default<Range, Size>
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{
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public:
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typedef sprout::adaptors::detail::sized_range_default<Range, Size> base_type;
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typedef typename base_type::range_type range_type;
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typedef typename base_type::size_type size_type;
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public:
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SPROUT_CONSTEXPR sized_range() SPROUT_DEFAULTED_DEFAULT_CONSTRUCTOR_DECL
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sized_range(sized_range const&) = default;
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explicit SPROUT_CONSTEXPR sized_range(range_type& range)
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: base_type(
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sprout::begin(range),
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base_type::static_size < static_cast<size_type>(sprout::size(range))
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? sprout::next(sprout::begin(range), base_type::static_size)
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: sprout::end(range)
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)
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{}
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};
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//
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// size_holder
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//
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template<std::size_t Size>
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class size_holder
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: public sprout::integral_constant<std::size_t, Size>
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{};
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//
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// sized
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//
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template<std::size_t Size>
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inline SPROUT_CONSTEXPR sprout::adaptors::size_holder<Size> sized() {
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return sprout::adaptors::size_holder<Size>();
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}
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//
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// operator|
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//
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template<typename Range, std::size_t Size>
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inline SPROUT_CONSTEXPR sprout::adaptors::sized_range<
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typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type,
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Size
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>
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operator|(Range&& lhs, sprout::adaptors::size_holder<Size> const&) {
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return sprout::adaptors::sized_range<
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typename std::remove_reference<typename sprout::lvalue_reference<Range>::type>::type,
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Size
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>(
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sprout::lvalue_forward<Range>(lhs)
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);
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}
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} // namespace adaptors
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//
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// container_construct_traits
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//
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template<typename Range, typename sprout::container_traits<Range>::size_type Size>
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struct container_construct_traits<sprout::adaptors::sized_range<Range, Size> >
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: public sprout::container_construct_traits<typename sprout::adaptors::sized_range<Range, Size>::base_type>
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{};
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} // namespace sprout
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#endif // #ifndef SPROUT_RANGE_ADAPTOR_SIZED_HPP
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