std::ranges::views::zip, std::ranges::zip_view

 

C++

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Standard library headers

Named requirements

Feature test macros(C++20)

Language support library

Concepts library(C++20)

Diagnostics library

Memory management library

Metaprogramming library(C++11)

General utilities library

Containers library

Iterators library

Ranges library(C++20)

Algorithms library

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Numerics library

Date and time library

Input/output library

Filesystem library(C++17)

Concurrency support library(C++11)

Execution control library(C++26)

Technical specifications

Symbols index

External libraries

 

Ranges library

Range access begin cbegin   end cend rbegin crbegin   rend crend size ssize   data cdata reserve_hint (C++26)   empty

Range conversions std::from_range_t std::from_range (C++23)(C++23)     to (C++23)

Dangling iterator handling dangling borrowed_iterator_t borrowed_subrange_t

Range primitives
range_size_trange_difference_trange_value_t elements_of (C++23)	iterator_tconst_iterator_tsentinel_tconst_sentinel_t (C++23)(C++23)	range_reference_trange_const_reference_trange_rvalue_reference_trange_common_reference_t (C++23)

Range concepts
range borrowed_range    common_range	sized_range viewable_range    view	input_range output_range forward_range	bidirectional_range    random_access_range contiguous_range	approximately_sized_range (C++26) constant_range (C++23)

Views
view_interface	subrange

Range factories
empty_viewviews::empty	single_viewviews::single	basic_istream_viewviews::istream	iota_viewviews::iota	repeat_viewviews::repeat (C++23)(C++23)

Range adaptors
views::all_tviews::all as_rvalue_viewviews::as_rvalue (C++23)(C++23)   filter_viewviews::filter transform_viewviews::transform take_viewviews::take take_while_viewviews::take_while common_viewviews::common views::counted to_input_viewviews::to_input (C++26)(C++26)	ref_view drop_viewviews::drop drop_while_viewviews::drop_while lazy_split_viewviews::lazy_split split_viewviews::split join_viewviews::join join_with_viewviews::join_with (C++23)(C++23)   concat_viewviews::concat (C++26)(C++26) cache_latest_viewviews::cache_latest (C++26)(C++26)	owning_view reverse_viewviews::reverse as_const_viewviews::as_const (C++23)(C++23) elements_viewviews::elements keys_viewviews::keys values_viewviews::values enumerate_viewviews::enumerate (C++23)(C++23) zip_viewviews::zip (C++23)(C++23) zip_transform_viewviews::zip_transform (C++23)(C++23)	adjacent_viewviews::adjacent (C++23)(C++23) views::pairwise (C++23) adjacent_transform_viewviews::adjacent_transform (C++23)(C++23) views::pairwise_transform (C++23) chunk_viewviews::chunk (C++23)(C++23) slide_viewviews::slide (C++23)(C++23) chunk_by_viewviews::chunk_by (C++23)(C++23) stride_viewviews::stride (C++23)(C++23) cartesian_product_viewviews::cartesian_product (C++23)(C++23)

Range generators std::generator (C++23)

Range adaptor closure objects range_adaptor_closure (C++23)

Range adaptor objects

Helper items
copyable-box movable-box (until C++23)  (C++23)	simple-view non-propagating-cache

 

std::ranges::zip_view

Member functions

zip_view::zip_view

zip_view::begin

zip_view::end

zip_view::size

Deduction guides

Iterator

Member functions

zip_view::iterator::iterator

zip_view::iterator::operator*

zip_view::iterator::operator[]

zip_view::iterator::operator++ zip_view::iterator::operator++(int) zip_view::iterator::operator-- zip_view::iterator::operator--(int) zip_view::iterator::operator+= zip_view::iterator::operator-=

Non-member functions

operator==(zip_view::iterator) operator<(zip_view::iterator) operator>(zip_view::iterator) operator<=(zip_view::iterator) operator>=(zip_view::iterator) operator<=>(zip_view::iterator)

operator+(zip_view::iterator) operator-(zip_view::iterator)

iter_move(zip_view::iterator)

iter_swap(zip_view::iterator)

Sentinel

Member functions

zip_view::sentinel::sentinel

Non-member functions

operator==(zip_view::iterator,zip_view::sentinel)

operator-(zip_view::iterator,zip_view::sentinel)

 

Defined in header <ranges>
template<ranges::input_range... Views>     requires (ranges::view<Views>&& ...)&&(sizeof...(Views)>0) class zip_view     :publicranges::view_interface<zip_view<Views...>>	(1)	(since C++23)
namespace views {     inlineconstexpr/*unspecified*/ zip =/*unspecified*/; }	(2)	(since C++23)
Call signature
template<ranges::viewable_range... Rs>     requires /* see below */ constexprranges::viewauto zip( Rs&&... rs);		(since C++23)

1)zip_view is a range adaptor that takes one or more views, and produces a view whose ith element is a tuple-like value consisting of the i^th elements of all views. The size of produced view is the minimum of sizes of all adapted views.

2)views::zip is a customization point object.

When calling with no argument, views::zip() is expression-equivalent to auto(views::empty<std::tuple<>>).

Otherwise, views::zip(rs...) is expression-equivalent to ranges::zip_view<views::all_t<decltype((rs))>...>(rs...).

zip_view always models input_range, and models forward_range, bidirectional_range, random_access_range, or sized_range if all adapted view types model the corresponding concept.

zip_view models common_range if

• sizeof...(Views) is equal to 1, and the only adapted view type models common_range, or
• at least one adapted view type does not model bidirectional_range, and every adapted view type models common_range, or
• every adapted view type models both random_access_range and sized_range.

Customization point objects

The name views::zip denotes a customization point object, which is a const function object of a literalsemiregular class type. See CustomizationPointObject for details.

Data members

Member	Description
std::tuple<Views...>views_	all adapted view objects (exposition-only member object*)

Member functions

(constructor)	constructs a zip_view (public member function)
begin	returns an iterator to the beginning (public member function)
end	returns an iterator or a sentinel to the end (public member function)
size	returns the number of elements, provided only if each underlying (adapted) range satisfies sized_range (public member function)
Inherited from std::ranges::view_interface
empty	returns whether the derived view is empty, provided only if it satisfies sized_range or forward_range (public member function of std::ranges::view_interface<D>)
cbegin (C++23)	returns a constant iterator to the beginning of the range (public member function of std::ranges::view_interface<D>)
cend (C++23)	returns a sentinel for the constant iterator of the range (public member function of std::ranges::view_interface<D>)
operator bool	returns whether the derived view is not empty, provided only if ranges::empty is applicable to it (public member function of std::ranges::view_interface<D>)
front	returns the first element in the derived view, provided if it satisfies forward_range (public member function of std::ranges::view_interface<D>)
back	returns the last element in the derived view, provided only if it satisfies bidirectional_range and common_range (public member function of std::ranges::view_interface<D>)
operator[]	returns the nth element in the derived view, provided only if it satisfies random_access_range (public member function of std::ranges::view_interface<D>)

Nested classes

iterator	the iterator type (exposition-only member class template*)
sentinel	the sentinel type used when zip_view is not a common_range (exposition-only member class template*)

Helper templates

template<class... Views> constexprbool enable_borrowed_range<ranges::zip_view<Views...>>=     (ranges::enable_borrowed_range<Views>&& ...);		(since C++23)

This specialization of ranges::enable_borrowed_range makes zip_view satisfy borrowed_range when each underlying view satisfies it.

Notes

Feature-test macro	Value	Std	Feature
__cpp_lib_ranges_zip	202110L	(C++23)	ranges::zip_view, ranges::zip_transform_view, ranges::adjacent_view, ranges::adjacent_transform_view

Example

Run this code

#include <array>#include <iostream>#include <list>#include <ranges>#include <string>#include <tuple>#include <vector>   void print(autoconst rem, autoconst& range){for(std::cout<< rem;autoconst& elem : range)std::cout<< elem <<' ';std::cout<<'\n';}   int main(){auto x =std::vector{1, 2, 3, 4};auto y =std::list<std::string>{"α", "β", "γ", "δ", "ε"};auto z =std::array{'A', 'B', 'C', 'D', 'E', 'F'};   print("Source views:", ""); print("x: ", x); print("y: ", y); print("z: ", z);   print("\nzip(x,y,z):", "");   for(std::tuple<int&, std::string&, char&> elem : std::views::zip(x, y, z)){std::cout<< std::get<0>(elem)<<' '<< std::get<1>(elem)<<' '<< std::get<2>(elem)<<'\n';   std::get<char&>(elem)+=('a'-'A');// modifies the element of z}   print("\nAfter modification, z: ", z);}

Output:

Source views: x: 1 2 3 4 y: α β γ δ ε z: A B C D E F   zip(x,y,z): 1 α A 2 β B 3 γ C 4 δ D   After modification, z: a b c d E F

See also

ranges::zip_transform_viewviews::zip_transform (C++23)	a view consisting of results of application of a transformation function to corresponding elements of the adapted views (class template)(customization point object)
ranges::elements_viewviews::elements (C++20)	takes a view consisting of tuple-like values and a number N and produces a view of Nth element of each tuple (class template)(range adaptor object)