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)