std::forward_list<T,Allocator>::assign_range

 

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forward_list::assign_range (C++23)

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operator==operator!=operator<operator>operator<=operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)

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template< container-compatible-range<T> R > void assign_range( R&& rg );		(since C++23)

Replaces elements in the container with a copy of each element in rg.

Each iterator in the range rg is dereferenced exactly once.

The behavior is undefined if rg overlaps with the container.

Parameters

rg	-	an input_range with reference type convertible to the element type of the container
Type requirements
- std::assignable_from<T&, ranges::range_reference_t<R>> must be modeled. Otherwise, the program is ill-formed.
- T must be EmplaceConstructible into the container from *ranges::begin(rg). Otherwise, the behavior is undefined.

Return value

(none)

Notes

Feature-test macro	Value	Std	Comment
__cpp_lib_containers_ranges	202202L	(C++23)	Ranges-aware construction and insertion

Example

Run this code

#include <algorithm>
#include <cassert>
#include <forward_list>
#include <list>
 
int main()
{
    const auto source = std::list{2, 7, 1};
    auto destination = std::forward_list{3, 1, 4};
#ifdef __cpp_lib_containers_ranges
    destination.assign_range(source);
#else
    destination.assign(source.cbegin(), source.cend());
#endif
    assert(std::ranges::equal(source, destination));
}

See also

insert_range_after (C++23)	inserts a range of elements after an element (public member function)
prepend_range (C++23)	adds a range of elements to the beginning (public member function)
assign (C++11)	assigns values to the container (public member function)