std::pmr::polymorphic_allocator::polymorphic_allocator (3) Linux Manual Page

std::pmr::polymorphic_allocator<T>::polymorphic_allocator – std::pmr::polymorphic_allocator<T>::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(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

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
select_on_container_copy_construction (public member function)