std::deque<T,Allocator>::prepend_range

 

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std::deque

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deque::deque deque::~deque deque::operator= deque::assign deque::assign_range (C++23)   deque::get_allocator Element access deque::at deque::operator[] deque::front deque::back Iterators deque::begindeque::cbegin (C++11) deque::enddeque::cend (C++11) deque::rbegindeque::crbegin (C++11) deque::renddeque::crend (C++11)	Capacity deque::empty deque::size deque::max_size deque::shrink_to_fit (DR*) Modifiers deque::clear deque::insert deque::insert_range (C++23) deque::emplace deque::erase deque::push_front deque::emplace_front (C++11) deque::prepend_range (C++23) deque::pop_front deque::push_back deque::emplace_back (C++11) deque::append_range (C++23) deque::pop_back deque::resize deque::swap
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operator==operator<=> (C++20) swap(std::deque) erase(std::deque)erase_if(std::deque) (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 > void prepend_range( R&& rg );		(since C++23)

Inserts, in non-reversing order, copies of elements in rg before begin(). Each iterator in the range rg is dereferenced exactly once.

All iterators (including the end() iterator) are invalidated. No 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 deque from *ranges::begin(rg). Also, T must be MoveInsertable into deque and T satisfies MoveConstructible, MoveAssignable, and Swappable. 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 <deque>
#include <vector>
 
int main()
{
    auto container = std::deque{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::deque{-3, -2, -1, 0, 1, 2, 3}));
}

See also

append_range (C++23)	adds a range of elements to the end (public member function)
insert_range (C++23)	inserts a range of elements (public member function)
push_front	inserts an element to the beginning (public member function)
emplace_front (C++11)	constructs an element in-place at the beginning (public member function)