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Showing content from https://en.cppreference.com/w/cpp/language/../../cpp/ranges/drop_while_view/begin.html below:

std::ranges::drop_while_view<V,Pred>::begin - cppreference.com

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.

[edit] Parameters

(none)

[edit] Return value

Iterator to the first element of the view.

[edit] 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);
}
[edit] See also returns an iterator or a sentinel to the end
(public member function) [edit]

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