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std::ranges...p_while_view(3) C++ Standard Libarystd::ranges...p_while_view(3) NAME std::ranges::drop_while_view::drop_while_view - std::ranges::drop_while_view::drop_while_view Synopsis drop_while_view() requires std::default_initializable<V> && (1) (since C++20) std::default_initializable<Pred> = default; constexpr drop_while_view( V base, Pred pred ); (2) (since C++20) Constructs a drop_while_view. 1) Default constructor. Value-initializes the underlying view and the predicate. 2) Move constructs the underlying view from base and the predicate from pred. Parameters base - underlying view pred - predicate Example // Run this code #include <array> #include <iostream> #include <ranges> int main() { constexpr std::array data{ 0, -1, -2, 3, 1, 4, 1, 5, }; auto view = std::ranges::drop_while_view{ data, [](int x) { return x <= 0; } }; for (int x: view) { std::cout << x << ' '; } std::cout << '\n'; } Output: 3 1 4 1 5 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 if Pred is not default_initializable, P2325R3 C++20 the default constructor the drop_while_view is also constructs a drop_while_view which not de- fault_initializable does not contain an Pred http://cppreference.com 2022.07.31 std::ranges...p_while_view(3)
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