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std::ranges...w::drop_view(3) C++ Standard Libarystd::ranges...w::drop_view(3) NAME std::ranges::drop_view::drop_view - std::ranges::drop_view::drop_view Synopsis drop_view() requires std::default_initializable<V> = default; (1) (since C++20) constexpr explicit drop_view( V base, (2) (since C++20) ranges::range_difference_t<V> count ); Constructs a drop_view. 1) Default constructor. Value-initializes the underlying view and initializes the count to 0. After construction, base() returns a copy of V() and size() equals to the size of the underlying view. 2) Initializes the underlying view with std::move(base) and the count with count. After construction, base() returns a copy of base and size() returns ranges::size(base) - count if the size of base is not less than count, or 0 otherwise. Parameters base - the underlying view count - number of elements to skip Example // Run this code #include <algorithm> #include <array> #include <iostream> #include <iterator> #include <ranges> int main() { constexpr std::array hi{'H', 'e', 'l', 'l', 'o', ',', ' ', 'C', '+', '+', '2', '0'}; std::ranges::for_each(hi, [](const char c){ std::cout << c; }); std::cout << '\n'; constexpr auto n = std::distance(hi.cbegin(), std::ranges::find(hi, 'C')); auto cxx = std::ranges::drop_view{hi, n}; std::ranges::for_each(cxx, [](const char c){ std::cout << c; }); std::cout << '\n'; } Output: Hello, C++20 C++20 Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Correct behavior LWG 3714 C++20 the multi-parameter constructor was not made explicit (P2711R1) explicit http://cppreference.com 2024.06.10 std::ranges...w::drop_view(3)
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