std::list<T,Allocator>::prepend_range

From cppreference.com
< cpp‎ | container‎ | list

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

Inserts, in non-reversing order, copies of elements in rg before begin(). Each iterator in the range rg is dereferenced exactly once.

Parameters

rg - a container compatible range, that is, an input_range whose elements are convertible to T.
Type requirements
-
T must be EmplaceConstructible into list from *ranges::begin(rg). Otherwise, the behavior is undefined.

Return value

(none)

Complexity

Linear in size of rg.

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 <list>
 
int main()
{
    auto data = std::list{0, 1, 2, 3};
    const auto prefix = {-3, -2, -1};
 
#if __cpp_lib_containers_ranges
    data.prepend_range(prefix);
#else
    data.insert(data.begin(), prefix.begin(), prefix.end());
#endif
    assert(std::ranges::equal(data, std::list{-3, -2, -1, 0, 1, 2, 3}));
}

See also

adds a range of elements to the end
(public member function)
inserts a range of elements
(public member function)
inserts an element to the beginning
(public member function)
constructs an element in-place at the beginning
(public member function)