tmp/tmpz5obdiyn/{from.md → to.md}
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| 1 |
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#### Class template `basic_istream_view::iterator` <a id="range.istream.iterator">[[range.istream.iterator]]</a>
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``` cpp
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namespace std::ranges {
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template<movable Val, class CharT, class Traits>
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requires default_initializable<Val> &&
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stream-extractable<Val, CharT, Traits>
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class basic_istream_view<Val, CharT, Traits>::iterator { // exposition only
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public:
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using iterator_concept = input_iterator_tag;
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using difference_type = ptrdiff_t;
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using value_type = Val;
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iterator() = default;
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constexpr explicit iterator(basic_istream_view& parent) noexcept;
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iterator(const iterator&) = delete;
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iterator(iterator&&) = default;
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iterator& operator=(const iterator&) = delete;
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iterator& operator=(iterator&&) = default;
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iterator& operator++();
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void operator++(int);
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Val& operator*() const;
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friend bool operator==(const iterator& x, default_sentinel_t);
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private:
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basic_istream_view* parent_ = nullptr; // exposition only
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};
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}
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```
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``` cpp
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constexpr explicit iterator(basic_istream_view& parent) noexcept;
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```
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*Effects:* Initializes *parent\_* with `addressof(parent)`.
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``` cpp
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iterator& operator++();
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```
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*Preconditions:* *`parent_`*`->`*`stream_`*` != nullptr` is `true`.
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*Effects:* Equivalent to:
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``` cpp
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*parent_->stream_>> parent_->object_;
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return *this;
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```
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``` cpp
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void operator++(int);
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```
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*Preconditions:* *`parent_`*`->`*`stream_`*` != nullptr` is `true`.
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*Effects:* Equivalent to `++*this`.
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``` cpp
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Val& operator*() const;
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```
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*Preconditions:* *`parent_`*`->`*`stream_`*` != nullptr` is `true`.
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*Effects:* Equivalent to: `return `*`parent_`*`->`*`object_`*`;`
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``` cpp
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friend bool operator==(const iterator& x, default_sentinel_t);
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```
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*Effects:* Equivalent to:
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`return x.`*`parent_`*` == nullptr || !*x.`*`parent_`*`->`*`stream_`*`;`
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