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| Associative | ||||
| Unordered associative | ||||
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(C++20) | ||||
(C++23) | ||||
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| Iterator invalidation | ||||
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| Non-member function table |
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| Deduction guides(C++17) | |||||||||||||||||||||
void swap( deque& other); | (until C++17) | |
void swap( deque& other)noexcept(/* see below */); | (since C++17) (constexpr since C++26) | |
Exchanges the contents of the container with those ofother. Does not invoke any move, copy, or swap operations on individual elements.
All iterators and references remain valid. Theend() iterator is invalidated.
Ifstd::allocator_traits<allocator_type>::propagate_on_container_swap::value istrue, then the allocators are exchanged using an unqualified call to non-member | (since C++11) |
Contents |
| other | - | container to exchange the contents with |
(none) | (until C++17) |
noexcept specification: noexcept(std::allocator_traits<Allocator>::is_always_equal::value) | (since C++17) |
Constant.
#include <iostream>#include <deque> template<class Os,class Co>Os& operator<<(Os& os,const Co& co){ os<<'{';for(constauto& i: co) os<<' '<< i;return os<<" } ";} int main(){std::deque<int> a1{1,2,3}, a2{4,5}; auto it1=std::next(a1.begin());auto it2=std::next(a2.begin()); int& ref1= a1.front();int& ref2= a2.front(); std::cout<< a1<< a2<<*it1<<' '<<*it2<<' '<< ref1<<' '<< ref2<<'\n'; a1.swap(a2);std::cout<< a1<< a2<<*it1<<' '<<*it2<<' '<< ref1<<' '<< ref2<<'\n'; // Note that after swap the iterators and references stay associated with their// original elements, e.g. it1 that pointed to an element in 'a1' with value 2// still points to the same element, though this element was moved into 'a2'.}
Output:
{ 1 2 3 } { 4 5 } 2 5 1 4{ 4 5 } { 1 2 3 } 2 5 1 4| specializes thestd::swap algorithm (function template)[edit] |
