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

From cppreference.com

 
 
 
 
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

#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

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