std::ranges::views::split, std::ranges::split_view

 

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)

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)

Execution support 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 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    sized_range	common_range view viewable_range	input_range output_range forward_range	bidirectional_range    random_access_range contiguous_range	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 ref_view owning_view as_rvalue_viewviews::as_rvalue (C++23)(C++23)   filter_viewviews::filter transform_viewviews::transform take_viewviews::take take_while_viewviews::take_while concat_viewviews::concat (C++26)(C++26)	drop_viewviews::drop drop_while_viewviews::drop_while join_viewviews::join join_with_viewviews::join_with (C++23)(C++23)   lazy_split_viewviews::lazy_split split_viewviews::split views::counted common_viewviews::common	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::split_view

Member functions

split_view::split_view

split_view::base

split_view::begin

split_view::end

split_view::find_next

Nested classes

split_view::iterator

split_view::sentinel

Deduction guides

 

Defined in header <ranges>
template< ranges::input_range V, ranges::forward_range Pattern > requires ranges::view<V> && ranges::view<Pattern> &&   std::indirectly_comparable<ranges::iterator_t<V>, ranges::iterator_t<Pattern>,                              ranges::equal_to> &&   (ranges::forward_range<V> || /*tiny-range*/<Pattern>) class split_view : public ranges::view_interface<split_view<V, Pattern>>	(1)	(since C++20)
namespace views {     inline constexpr /*unspecified*/ split = /*unspecified*/; }	(2)	(since C++20)

1) split_view takes a view and a delimiter, and splits the view into subranges on the delimiter.

Two major scenarios are supported:

• The view is a input_range, the delimiter is a single element (wrapped in a single_view).
• The view is a forward_range, the delimiter is a view of elements.

The exposition-only concept /*tiny-range*/<Pattern> is satisfied if Pattern satisfies sized_range, Pattern::size() is a constant expression, and the value of Pattern::size() is less than or equal to 1. Notably, empty_view and single_view satisfy this concept.

2) The expression views::split(E,F) is expression-equivalent to split_view{E,F}.

Member functions

(constructor)	constructs a split_view (public member function)
base	returns a copy of the underlying (adapted) 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)

Nested classes

outer-iterator	the iterator type (public member class)
inner-iterator	the iterator type of the inner range (public member class)

Example

Run this code

#include <algorithm>
#include <iostream>
#include <ranges>
#include <string_view>
 
auto print = [](auto const& view)
{
    // `view` is a std::views::split_view::/*outer-iterator*/::value_type
 
    for (std::cout << "{ "; const auto element : view)
        std::cout << element << ' ';
    std::cout << "} ";
};
 
int main()
{
    constexpr static auto source = { 0, 1,0, 2,3,0, 4,5,6,0, 7,8,9 };
    constexpr int delimiter {0};
    constexpr std::ranges::split_view split_view {source, delimiter};
    std::cout << "splits[" << std::ranges::distance(split_view) << "]:  ";
    for (auto const& split: split_view)
        print(split);
 
    constexpr std::string_view hello { "Hello C++ 20 !" };
    std::cout << "\n" "substrings: ";
    std::ranges::for_each(hello | std::views::split(' '), print);
}

Output:

splits[5]:  { } { 1 } { 2 3 } { 4 5 6 } { 7 8 9 } 
substrings: { H e l l o } { C + + } { 2 0 } { ! }

See also

ranges::join_viewviews::join (C++20)

a view consisting of the sequence obtained from flattening a view of ranges (class template) (range adaptor object)