`V` models only `input_range`
| ||

constexpr __outer_iterator begin(); | (1) | (since C++23) |

`V` models `forward_range`
| ||

constexpr auto begin() requires (!__simple_view<V>); | (2) | (since C++23) |

constexpr auto begin() const requires ranges::forward_range<const V>; | (3) | (since C++23) |

Returns an iterator to the first element of the `chunk_view`

.

Let

*base_*

denote the underlying view.
1) Available only if

`V`

models `input_range`

. Equivalent to: current_ = ranges::begin(base_); remainder_ = n_; return __outer_iterator(*this);

*current_*

, *remainder_*

, and *n_*

are underlying exposition only data members of `chunk_view`

.
2) Available if

`V`

models `forward_range`

. Equivalent to: `return iterator<false>(this, ranges::begin(base_));`

, where `iterator`

is exposition only nested class.
3) Available if

`V`

models `forward_range`

. Equivalent to: `return iterator<true>(this, ranges::begin(base_));`

, where `iterator`

is exposition only nested class.(none).

An iterator to the first element of the `chunk_view`

, as described above.

(C++23) | returns an iterator or a sentinel to the end (public member function) |

(C++20) | returns an iterator to the beginning of a range (customization point object) |

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