# std::experimental::pmr::polymorphic_allocator<T>::polymorphic_allocator

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< cpp‎ | experimental‎ | polymorphic allocator

polymorphic_allocator() noexcept; | (1) |
polymorphic_allocator( const polymorphic_allocator& other ) noexcept = default; | (2) |
template< class U > polymorphic_allocator( const polymorphic_allocator<U>& other ) noexcept; | (3) |
polymorphic_allocator( memory_resource* r); | (4) |

Constructs a new `polymorphic_allocator`.

1) Constructs a `polymorphic_allocator` using the return value of std::experimental::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.
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