NAME¶

std::pmr::polymorphic_allocator::polymorphic_allocator - std::pmr::polymorphic_allocator::polymorphic_allocator

Synopsis¶

polymorphic_allocator() noexcept; (1)
polymorphic_allocator( const polymorphic_allocator& other ) = default; (2)
template< class U > (3)
polymorphic_allocator( const polymorphic_allocator<U>& other ) noexcept;
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
select_on_container_copy_construction a container's copy constructor
(public member function)