NAME¶

std::vector::insert_range - std::vector::insert_range

Synopsis¶

template< container-compatible-range<T> R > (since C++23)
constexpr iterator insert_range( const_iterator pos, R&& rg );

Inserts, in non-reversing order, copies of elements in rg before pos.

If after the operation the new size() is greater than old capacity() a reallocation
takes place, in which case all iterators (including the end() iterator) and all
references to the elements are invalidated. Otherwise, only the iterators and
references before the insertion point remain valid.

Each iterator in the range rg is dereferenced exactly once.

The behavior is undefined if rg overlaps with the container.

Parameters¶

pos - iterator before which the content will be inserted
(pos may be the end() iterator)
rg - a container compatible range, that is, an input_range
whose elements are convertible to T

Type requirements¶

-
T must be EmplaceConstructible into vector from *ranges::begin(rg). Also, T must be
MoveInsertable into vector and T satisfies MoveConstructible, MoveAssignable, and
Swappable. Otherwise, the behavior is undefined.

Return value¶

An iterator that points at the copy of the first element inserted into vector or at
pos if rg is empty.

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 <iterator>
#include <vector>
#include <list>

int main()
{
auto container = std::vector{1, 2, 3, 4};
auto pos = std::next(container.begin(), 2);
assert(*pos == 3);
const auto rg = std::list{-1, -2, -3};

#ifdef __cpp_lib_containers_ranges
container.insert_range(pos, rg);
#else
container.insert(pos, rg.cbegin(), rg.cend());
#endif
assert(std::ranges::equal(container, std::vector{1, 2, -1, -2, -3, 3, 4}));
}

See also¶

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