std::ranges::contiguous_range

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

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

Strings library

Text processing library

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

 

Defined in header <ranges>
template<class T > concept contiguous_range =     ranges::random_access_range<T>&&     std::contiguous_iterator<ranges::iterator_t<T>>&&     requires(T& t){         {ranges::data(t)}->             std::same_as<std::add_pointer_t<ranges::range_reference_t<T>>>;     };		(since C++20)

The contiguous_range concept is a refinement of range for which ranges::begin returns a model of contiguous_iterator and the customization point ranges::data is usable.

Semantic requirements

T models contiguous_range only if given an expression e such that decltype((e)) is T&, std::to_address(ranges::begin(e))==ranges::data(e).

Example

Run this code

#include <array>#include <deque>#include <list>#include <mdspan>#include <ranges>#include <set>#include <span>#include <string_view>#include <valarray>#include <vector>   template<typename T> concept CR = std::ranges::contiguous_range<T>;   // zstring being a ranges::contiguous_range doesn't have to be a ranges::sized_rangestruct zstring {struct sentinel {friendconstexprbool operator==(constchar* str, sentinel)noexcept{return*str =='\0';}};   constchar* str;   constchar* begin()constnoexcept{return str;} sentinel end()constnoexcept{return{};}};   int main(){int a[4]; static_assert( CR<std::vector<int>> and not CR<std::vector<bool>> and not CR<std::deque<int>> and CR<std::valarray<int>> and CR<decltype(a)> and not CR<std::list<int>> and not CR<std::set<int>> and CR<std::array<std::list<int>,42>> and CR<std::string_view> and CR<zstring> and CR<std::span<constint>> and not CR<std::mdspan<int, std::dims<1>>>);}

See also

ranges::sized_range (C++20)	specifies that a range knows its size in constant time (concept)
ranges::random_access_range (C++20)	specifies a range whose iterator type satisfies random_access_iterator (concept)