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std::ranges..._view::begin(3) C++ Standard Libarystd::ranges..._view::begin(3) NAME std::ranges::common_view::begin - std::ranges::common_view::begin Synopsis constexpr auto begin() requires (!__simple_view<V>); (1) (since C++20) constexpr auto begin() const requires range<const V>; (2) (since C++20) 1) Returns an iterator to the first element of the common_view, that is: * ranges::begin(base_), if both ranges::random_access_range<V> and ranges::sized_range<V> are satisfied, * std::common_iterator<ranges::iterator_t<V>, ranges::sentinel_t<V>>(ranges::begin(base_)) otherwise. Here base_ (the name is for exposition only purposes) is the under- lying view. 2) Same as (1), but V is const-qualified. Parameters (none) Return value An iterator to the beginning of the underlying view. Example // Run this code #include <iostream> #include <numeric> #include <ranges> #include <string_view> int main() { constexpr auto common = std::views::iota(1) | std::views::take(3) | std::views::common ; for (int i{}; int e : common) std::cout << (i++ ? " + " : "") << e; std::cout << " = " << std::accumulate(common.begin(), com- mon.end(), 0) << '\n'; } Output: 1 + 2 + 3 = 6 Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Cor- rect behavior LWG 4012 C++20 non-const overload missed simple-view check added See also end returns an iterator to the end (C++20) (public member function) ranges::begin returns an iterator to the beginning of a range (C++20) (customization point object) ranges::end returns a sentinel indicating the end of a range (C++20) (customization point object) http://cppreference.com 2024.06.10 std::ranges..._view::begin(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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