std::ranges::drop_view<V>::drop_view

 

C++

Compiler support

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_view

Member functions

drop_view::drop_view (C++20)

drop_view::base (C++20)

drop_view::begin (C++20)

drop_view::end (C++20)

drop_view::size (C++20)

Deduction guides

 

drop_view() requires std::default_initializable<V> = default;	(1)	(since C++20)
constexpr drop_view( V base, ranges::range_difference_t<V> count );	(2)	(since C++20)

Constructs a drop_view.

1) Default constructor. Value-initializes the underlying view and initializes the count to ​0​. After construction, base() returns a copy of V() and size() equals to the size of the underlying view.

2) Initializes the underlying view with std::move(base) and the count with count. After construction, base() returns a copy of base and size() returns ranges::size(base) - count if the size of base is not less than count, or ​0​ otherwise.

Parameters

base	-	the underlying view
count	-	number of elements to skip.

Example

Run this code

#include <algorithm>
#include <array>
#include <iostream>
#include <iterator>
#include <ranges>
 
int main()
{
    constexpr std::array hi{ 'H','e','l','l','o',',',' ','C','+','+','2','0' };
 
    std::ranges::for_each(hi, [](const char c){ std::cout << c; });
    std::cout << '\n';
 
    constexpr auto n = std::distance(hi.cbegin(), std::ranges::find(hi, 'C'));
 
    auto cxx = std::ranges::drop_view{ hi, n };
 
    std::ranges::for_each(cxx, [](const char c){ std::cout << c; });
    std::cout << '\n';
}

Output:

Hello, C++20
C++20