std::ranges::drop_while_view<V,Pred>::begin

 

C++

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Freestanding and hosted

Language

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Ranges library

Range access
begin cbegin end cend	rbegin crbegin rend crend	size ssize data cdata	empty
Range conversions
to (C++23)
Range primitives
range_size_trange_difference_t range_value_t	range_reference_trange_const_reference_trange_rvalue_reference_t   (C++23)	iterator_tconst_iterator_tsentinel_t (C++23)
Dangling iterator handling
dangling	borrowed_iterator_t	borrowed_subrange_t
Range concepts
range borrowed_range    sized_range constant_range (C++23)	common_range view viewable_range	input_range output_range forward_range	bidirectional_range random_access_range contiguous_range
Views
view_interface	subrange
Factories
empty_viewviews::empty iota_viewviews::iota	single_viewviews::single basic_istream_viewviews::istream	repeat_viewviews::repeat (C++23)(C++23)
Adaptors
ref_view views::all_tviews::all common_viewviews::common owning_view views::counted reverse_viewviews::reverse zip_viewviews::zip (C++23)(C++23) as_const_viewviews::as_const (C++23)(C++23) as_rvalue_viewviews::as_rvalue (C++23)(C++23)	take_viewviews::take take_while_viewviews::take_while drop_viewviews::drop drop_while_viewviews::drop_while zip_transform_viewviews::zip_transform (C++23)(C++23) adjacent_transform_viewviews::adjacent_transform (C++23)(C++23)   cartesian_product_viewviews::cartesian_product (C++23)(C++23)	elements_viewviews::elements keys_viewviews::keys values_viewviews::values transform_viewviews::transform adjacent_viewviews::adjacent (C++23)(C++23) slide_viewviews::slide (C++23)(C++23) stride_viewviews::stride (C++23)(C++23)	filter_viewviews::filter join_viewviews::join split_viewviews::split lazy_split_viewviews::lazy_split join_with_viewviews::join_with (C++23)(C++23) chunk_viewviews::chunk (C++23)(C++23) chunk_by_viewviews::chunk_by (C++23)(C++23)
Range adaptor objects
Range adaptor closure objects
Helper items
copyable-box	simple-view

 

std::ranges::drop_while_view

Member functions

drop_while_view::drop_while_view (C++20)

drop_while_view::base (C++20)

drop_while_view::pred (C++20)

drop_while_view::begin (C++20)

drop_while_view::end (C++20)

Deduction guides

 

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

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; }
    };
 
    std::cout << *view.begin() << '\n';
}

Output:

3

See also

end (C++20)

returns an iterator or a sentinel to the end (public member function)