std::ranges::drop_while_view<V,Pred>::begin
constexpr auto begin(); | (since C++20) |
Returns an iterator to the first element of the view.
Effectively returns ranges::find_if_not(base_, std::cref(pred())), where base_ is the underlying view. The behavior is undefined if *this does not store a predicate.
In order to provide the amortized constant time complexity required by the range concept, this function caches the result within the drop_while_view object for use on subsequent calls.
Parameters
(none)
Return value
Iterator to the first element of the view.
Example
#include <cassert>
#include <ranges>
int main()
{
static constexpr auto data = {0, -1, -2, 3, 1, 4, 1, 5};
auto view = std::ranges::drop_while_view{data, [](int x){ return x <= 0; }};
assert(view.begin()[0] == 3);
}
See also
| returns an iterator or a sentinel to the end (public member function) |
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