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std::ranges..._view::begin(3) C++ Standard Libarystd::ranges..._view::begin(3) NAME std::ranges::join_view::begin - std::ranges::join_view::begin Synopsis constexpr auto begin(); (1) (since C++20) constexpr auto begin() const requires ranges::input_range<const V> && (2) (since C++20) std::is_reference_v<ranges::range_reference_t<const V>>; Returns an iterator to the first element of the join_view. Given base_ is the underlying view, 1) Equivalent to return /*iterator*/<true>{*this, ranges::be- gin(base_)}; if __SimpleView<V> is satisfied and ranges::range_reference_t<V> is reference type. Otherwise, equivalent to return /*iterator*/<false>{*this, ranges::begin(base_)};. 2) Equivalent to return /*iterator*/<true>{*this, ranges::be- gin(base_)};. Parameters (none) Return value Iterator to the first element. Notes When ranges::range_reference_t<V> is not a reference type, that is, deferencing an iterator of V returns a prvalue temporary, the join_view is only an input_range, in which case only single-pass iteration is supported, and repeated calls to begin() may not give meaningful results. Example This section is incomplete Reason: no example See also end returns an iterator or a sentinel to the end (C++20) (public member function) ranges::begin returns an iterator to the beginning of a range (C++20) (customization point object) Category: * Todo no example http://cppreference.com 2024.06.10 std::ranges..._view::begin(3)
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