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127 lines
3.8 KiB
C++
127 lines
3.8 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2014-present
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// Project home: https://github.com/ericniebler/range-v3
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//
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#ifndef RANGES_V3_VIEW_ALL_HPP
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#define RANGES_V3_VIEW_ALL_HPP
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#include <type_traits>
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#include <meta/meta.hpp>
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/range/access.hpp>
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#include <range/v3/range/concepts.hpp>
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#include <range/v3/range/primitives.hpp>
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#include <range/v3/utility/static_const.hpp>
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#include <range/v3/view/ref.hpp>
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#include <range/v3/view/subrange.hpp>
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#include <range/v3/view/view.hpp>
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#include <range/v3/detail/prologue.hpp>
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namespace ranges
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{
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/// \addtogroup group-views
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/// @{
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namespace views
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{
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struct all_fn
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{
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private:
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/// If it's a view already, pass it though.
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template<typename T>
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static constexpr auto from_range_(T && t, std::true_type, detail::ignore_t,
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detail::ignore_t)
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{
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return static_cast<T &&>(t);
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}
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/// If it is container-like, turn it into a view, being careful
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/// to preserve the Sized-ness of the range.
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template<typename T>
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static constexpr auto from_range_(T && t, std::false_type, std::true_type,
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detail::ignore_t)
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{
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return ranges::views::ref(t);
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}
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/// Not a view and not an lvalue? If it's a borrowed_range, then
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/// return a subrange holding the range's begin/end.
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template<typename T>
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static constexpr auto from_range_(T && t, std::false_type, std::false_type,
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std::true_type)
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{
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return make_subrange(static_cast<T &&>(t));
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}
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public:
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template(typename T)(
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requires range<T &> AND viewable_range<T>)
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constexpr auto operator()(T && t) const
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{
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return all_fn::from_range_(static_cast<T &&>(t),
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meta::bool_<view_<uncvref_t<T>>>{},
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std::is_lvalue_reference<T>{},
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meta::bool_<borrowed_range<T>>{});
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}
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template<typename T>
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RANGES_DEPRECATED("Passing a reference_wrapper to views::all is deprecated.")
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constexpr ref_view<T> operator()(std::reference_wrapper<T> r) const
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{
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return ranges::views::ref(r.get());
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}
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};
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/// \relates all_fn
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/// \ingroup group-views
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RANGES_INLINE_VARIABLE(view_closure<all_fn>, all)
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template<typename Rng>
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using all_t = decltype(all(std::declval<Rng>()));
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} // namespace views
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template<typename Rng>
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struct identity_adaptor : Rng
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{
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CPP_assert(view_<Rng>);
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identity_adaptor() = default;
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constexpr explicit identity_adaptor(Rng const & rng)
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: Rng(rng)
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{}
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constexpr explicit identity_adaptor(Rng && rng)
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: Rng(detail::move(rng))
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{}
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};
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namespace cpp20
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{
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namespace views
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{
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using ranges::views::all;
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using ranges::views::all_t;
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}
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template(typename Rng)(
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requires viewable_range<Rng>)
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using all_view RANGES_DEPRECATED(
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"Please use ranges::cpp20::views::all_t instead.") =
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ranges::views::all_t<Rng>;
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} // namespace cpp20
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/// @}
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} // namespace ranges
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#include <range/v3/detail/epilogue.hpp>
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#endif
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