std::vector<T,Allocator>::assign_range

 

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std::vector

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vector::vector vector::~vector vector::operator= vector::assign vector::assign_range (C++23)   vector::get_allocator Element access vector::operator[] vector::at vector::data vector::front vector::back Iterators vector::beginvector::cbegin (C++11) vector::endvector::cend (C++11) vector::rbeginvector::crbegin (C++11) vector::rendvector::crend (C++11)	Capacity vector::empty vector::size vector::max_size vector::reserve vector::capacity vector::shrink_to_fit (DR*) Modifiers vector::clear vector::erase vector::insert vector::insert_range (C++23) vector::append_range (C++23) vector::emplace (C++11) vector::emplace_back (C++11) vector::push_back vector::pop_back vector::resize vector::swap
Non-member functions
operator==operator<=> (C++20) swap(std::vector) erase(std::vector)erase_if(std::vector) (C++20)(C++20)	operator!=operator<operator>operator<=operator>= (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)
Deduction guides(C++17)

 

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

Replaces elements in the container with a copy of each element in rg.

All iterators (including the end() iterator) and all references to the elements are invalidated.

Each iterator in the range rg is dereferenced exactly once.

The behavior is undefined if rg overlaps with the container.

Parameters

rg	-	an input_range with reference type convertible to the element type of the container
Type requirements
- std::assignable_from<T&, ranges::range_reference_t<R>> must be modeled. Otherwise, the program is ill-formed.
- T must be EmplaceConstructible into the container from *ranges::begin(rg). If R models neither sized_range nor forward_range, T must be also MoveInsertable into the container. Otherwise, the behavior is undefined.

Return value

(none)

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 <vector>
#include <list>
 
int main()
{
    const auto source = std::list{2, 7, 1};
    auto destination = std::vector{3, 1, 4};
#ifdef __cpp_lib_containers_ranges
    destination.assign_range(source);
#else
    destination.assign(source.cbegin(), source.cend());
#endif
    assert(std::ranges::equal(source, destination));
}

See also

insert_range (C++23)	inserts a range of elements (public member function)
append_range (C++23)	adds a range of elements to the end (public member function)
assign	assigns values to the container (public member function)
operator=	assigns values to the container (public member function)