std::pmr::polymorphic_allocator::polymorphic_allocator
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< cpp | memory | polymorphic allocator
| polymorphic_allocator(); |
(1) | |
| polymorphic_allocator( const polymorphic_allocator& other ) = default; |
(2) | |
| template< class U > polymorphic_allocator( const polymorphic_allocator<U>& other ); |
(3) | |
| polymorphic_allocator( memory_resource* r); |
(4) | |
Constructs a new polymorphic_allocator.
1) Constructs a
polymorphic_allocator using the return value of std::pmr::get_default_resource() as the underlying memory resource.2-3) Constructs a
polymorphic_allocator using other.resource() as the underlying memory resource.4) Constructs a
polymorphic_allocator using r as the underlying memory resource. This constructor provides an implicit conversion from memory_resource*.Parameters
| other | - | another polymorphic_allocator to copy from
|
| r | - | pointer to the memory resource to use. May not be null. |
Exceptions
1,3)
noexcept specification:
noexcept
4) Throws nothing.
Notes
Copying a container using a polymorphic_allocator will not call the allocator's copy constructor. Instead, the new container will use the return value of select_on_container_copy_construction (a default-constructed polymorphic_allocator) as its allocator.
See also
Create a new polymorphic_allocator for use by a container's copy constructor (public member function) |