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std::list::prepend_range(3) C++ Standard Libary std::list::prepend_range(3)

NAME

std::list::prepend_range - std::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 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 <list>
#include <vector>


int main()
{
auto container = std::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(container.begin(), rg.cbegin(), rg.cend());
#endif
assert(std::ranges::equal(container, std::list{-3, -2, -1, 0, 1, 2, 3}));
}

See also


append_range adds a range of elements to the end
(C++23) (public member function)
insert_range inserts a range of elements
(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
(C++11) (public member function)

2024.06.10 http://cppreference.com