std::forward_list::prepend_range(3)

NAME
std::forward_list::prepend_range - std::forward_list::prepend_range

Synopsis
   template< container-compatible-range<T> R > (since C++23)
   void prepend_range( R&& rg );
   Inserts, in non-reversing order, copies of elements in rg before begin(). Each
   iterator in the range rg is dereferenced exactly once.
   No iterators or references are invalidated.

Parameters
   rg - a container compatible range, that is, an input_range whose
                      elements are convertible to T

Type requirements
   -
   T must be EmplaceConstructible into forward_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 Feature
   __cpp_lib_containers_ranges 202202L (C++23) Ranges-aware construction and insertion

Example
// Run this code
 #include <algorithm>
 #include <cassert>
 #include <forward_list>
 #include <vector>
 int main()
 {
     auto container = std::forward_list{0, 1, 2, 3};
     const auto rg = std::vector{-3, -2, -1};
 #if __cpp_lib_containers_ranges
     container.prepend_range(rg);
 #else
     container.insert_after(container.before_begin(), rg.cbegin(), rg.cend());
 #endif
     assert(std::ranges::equal(container, std::forward_list{-3, -2, -1, 0, 1, 2, 3}));
 }

See also
   insert_range inserts a range of elements
   (C++23) (public member function)
   insert_range_after inserts a range of elements after an element
   (C++23) (public member function)
   push_front inserts an element to the beginning
                      (public member function)
   emplace_front constructs an element in-place at the beginning
                      (public member function)