std::ranges::drop_while_view<V,Pred>::drop_while_view
drop_while_view() requires std::default_initializable<V> && std::default_initializable<Pred> = default; |
(1) | (since C++20) |
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
#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 retroactively to previously published C++ standards.
DR | Applied to | Behavior as published | Correct behavior |
---|---|---|---|
P2325R3 | C++20 | if Pred is not default_initializable , the default constructorconstructs a drop_while_view which does not contain an Pred |
the drop_while_view is alsonot default_initializable |
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