std::pmr::polymorphic_allocator<T>::polymorphic_allocator
polymorphic_allocator() noexcept; |
(1) | |
polymorphic_allocator( const polymorphic_allocator& other ) = default; |
(2) | |
template< class U > polymorphic_allocator( const polymorphic_allocator<U>& other ) noexcept; |
(3) | |
polymorphic_allocator( std::pmr::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
std::pmr::memory_resource*.
Parameters
| other | - | another polymorphic_allocator to copy from |
| r | - | pointer to the memory resource to use. May not be null. |
Exceptions
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) |
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