std::queue::queue
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<tbody> </tbody> explicit queue( const Container& cont = Container() ); explicit queue( const Container& cont ); |
(1) | ( C++11) ( C++11) |
explicit queue( Container&& cont = Container() ); |
(2) | ( C++11) |
queue( const queue& other ); |
(3) | |
queue( queue&& other ); |
(4) | ( C++11) |
template< class Alloc > explicit queue( const Alloc& alloc ); |
(5) | ( C++11) |
template< class Alloc > queue( const Container& cont, const Alloc& alloc ); |
(6) | ( C++11) |
template< class Alloc > queue( Container&& cont, const Alloc& alloc ); |
(7) | ( C++11) |
template< class Alloc > queue( const queue& other, const Alloc& alloc ); |
(8) | ( C++11) |
template< class Alloc > queue( queue&& other, const Alloc& alloc ); |
(9) | ( C++11) |
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:
Constructs new underlying container of the container adaptor from a variety of data sources.
1)
c cont. ( C++11) :
Copy-constructs the underlying container
c with the contents of cont. This is also the default constructor ( C++11)2)
Move-
c std::move(cont). ( C++11) :
Move-constructs the underlying container
c with std::move(cont). This is also the default constructor ( C++11)3)
.
other.c. ( )4)
.
std::move(other.c). ( )5-9)
std::uses_allocator<container_type, Alloc>::value == true, , - ( ).:
The following constructors are only defined if
std::uses_allocator<container_type, Alloc>::value == true, that is, if the underlying container is an allocator-aware container (true for all standard library containers).5)
alloc . c(alloc).:
Constructs the underlying container using
alloc as allocator. Effectively calls c(alloc).6)
cont alloc . c(cont, alloc).:
Constructs the underlying container with the contents of
cont and using alloc as allocator. Effectively calls c(cont, alloc).7)
cont alloc . c(std::move(cont), alloc).:
Constructs the underlying container with the contents of
cont using move semantics while utilising alloc as allocator. Effectively calls c(std::move(cont), alloc).8)
other.c alloc . c(athor.c, alloc).:
Constructs the adaptor with the contents of
other.c and using alloc as allocator. Effectively calls c(athor.c, alloc).9)
other alloc . c(std::move(other.c), alloc).:
Constructs the adaptor with the contents of
other using move semantics while utilising alloc as allocator. Effectively calls c(std::move(other.c), alloc).| alloc | ||
| other | ||
| cont | ||
| first, last | ||
-Alloc Allocator.
| ||
-Container Container. The constructors (5-10) are only defined if Container meets the requirements of AllocatorAwareContainer
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-InputIt InputIterator.
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2, 4, 7, 9:
#include <queue>
#include <deque>
#include <iostream>
int main()
{
std::queue<int> c1;
c1.push(5);
std::cout << c1.size() << '\n';
std::queue<int> c2(c1);
std::cout << c2.size() << '\n';
std::deque<int> deq {3, 1, 4, 1, 5};
std::queue<int> c3(deq);
std::cout << c3.size() << '\n';
}
:
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5
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