cppdraft_translate/cppdraft/range/common/view.md

[range.common.view]

25 Ranges library [ranges]

25.7 Range adaptors [range.adaptors]

25.7.20 Common view [range.common]

25.7.20.2 Class template common_view [range.common.view]

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namespace std::ranges {template<view V>requires ( && copyable<iterator_t>)class common_view : public view_interface<common_view> {private: V base_ = V(); // exposition onlypublic: common_view() requires default_initializable = default; constexpr explicit common_view(V r); constexpr V base() const & requires copy_constructible { return base_; }constexpr V base() && { return std::move(base_); }constexpr auto begin() requires () {if constexpr (random_access_range && sized_range)return ranges::begin(base_); elsereturn common_iterator<iterator_t, sentinel_t>(ranges::begin(base_)); }constexpr auto begin() const requires range {if constexpr (random_access_range && sized_range)return ranges::begin(base_); elsereturn common_iterator<iterator_t, sentinel_t>(ranges::begin(base_)); }constexpr auto end() requires () {if constexpr (random_access_range && sized_range)return ranges::begin(base_) + ranges::distance(base_); elsereturn common_iterator<iterator_t, sentinel_t>(ranges::end(base_)); }constexpr auto end() const requires range {if constexpr (random_access_range && sized_range)return ranges::begin(base_) + ranges::distance(base_); elsereturn common_iterator<iterator_t, sentinel_t>(ranges::end(base_)); }constexpr auto size() requires sized_range {return ranges::size(base_); }constexpr auto size() const requires sized_range {return ranges::size(base_); }constexpr auto reserve_hint() requires approximately_sized_range {return ranges::reserve_hint(base_); }constexpr auto reserve_hint() const requires approximately_sized_range {return ranges::reserve_hint(base_); }}; template common_view(R&&) -> common_view<views::all_t>;}

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constexpr explicit common_view(V base);

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Effects: Initializes base_ with std​::​move(base).