25 Ranges library [ranges]

25.6 Range factories [range.factories]

25.6.6 Istream view [range.istream]

25.6.6.2 Class template basic_istream_view [range.istream.view]

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namespace std::ranges { template<class Val, class CharT, class Traits> concept stream-extractable = // exposition only requires(basic_istream<CharT, Traits>& is, Val& t) { is >> t; }; template<movable Val, class CharT, class Traits = char_traits<CharT>> requires default_initializable<Val> && stream-extractable<Val, CharT, Traits> class basic_istream_view : public view_interface<basic_istream_view<Val, CharT, Traits>> { public: constexpr explicit basic_istream_view(basic_istream<CharT, Traits>& stream); constexpr auto begin() { *stream_ >> value_; return iterator{*this}; } constexpr default_sentinel_t end() const noexcept; private: // [range.istream.iterator], class basic_istream_view​::​iterator struct iterator; // exposition only basic_istream<CharT, Traits>* stream_; // exposition only Val value_ = Val(); // exposition only }; }
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constexpr explicit basic_istream_view(basic_istream<CharT, Traits>& stream);
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Effects: Initializes stream_ with addressof(stream).
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constexpr default_sentinel_t end() const noexcept;
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Effects: Equivalent to: return default_sentinel;