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/// \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_SIZE_HPP |
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#define RANGES_V3_SIZE_HPP |
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#include |
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#include |
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#include |
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#include |
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namespace ranges |
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{ |
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inline namespace v3 |
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{ |
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/// \addtogroup group-concepts |
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// Specialize this if the default is wrong. |
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template |
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struct disable_sized_range : std::false_type {}; |
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/// \cond |
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namespace _size_ |
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{ |
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template |
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void size(T const &) = delete; |
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#ifdef RANGES_WORKAROUND_MSVC_620035 |
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void size(); |
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#endif |
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struct fn : iter_size_fn |
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{ |
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private: |
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template |
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static constexpr std::size_t impl_(R (&)[N], int) noexcept |
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{ |
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return N; |
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} |
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// Prefer member if it returns Integral. |
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template
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typename = meta::if_c()>, |
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typename N = decltype(aux::copy(std::declval().size())), |
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CONCEPT_REQUIRES_(Integral())> |
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static constexpr N impl_(R &r, int) |
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RANGES_AUTO_RETURN_NOEXCEPT |
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( |
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r.size() |
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) |
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// Use ADL if it returns Integral. |
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template
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typename = meta::if_c()>, |
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typename N = decltype(aux::copy(size(std::declval()))), |
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CONCEPT_REQUIRES_(Integral())> |
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static constexpr N impl_(R &r, long) |
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RANGES_AUTO_RETURN_NOEXCEPT |
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( |
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size(r) |
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) |
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template
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typename I = decltype(ranges::cbegin(std::declval())), |
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CONCEPT_REQUIRES_(ForwardIterator())> |
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static RANGES_CXX14_CONSTEXPR auto impl_(R &r, ...) |
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RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT |
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( |
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ranges::iter_size(ranges::cbegin(r), ranges::cend(r)) |
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) |
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public: |
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using iter_size_fn::operator(); |
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template |
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constexpr auto operator()(R &&r) const |
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RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT |
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( |
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fn::impl_(r, 42) |
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) |
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template |
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constexpr auto operator()(std::reference_wrapper ref) const |
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RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT |
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( |
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Fn()(ref.get()) |
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) |
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template |
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constexpr auto operator()(ranges::reference_wrapper ref) const |
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RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT |
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( |
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Fn()(ref.get()) |
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) |
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}; |
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} |
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/// \endcond |
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/// \ingroup group-core |
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/// \return The result of an unqualified call to `size` |
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inline namespace CPOs |
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{ |
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RANGES_INLINE_VARIABLE(_size_::fn, size) |
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} |
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} |
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} |
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#endif |