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

From cppreference.com
T* allocate( std::size_t n ) ;
(library fundamentals TS)

Allocates storage for n objects of type T using the underlying memory resource. Equivalent to

return static_cast <T* > (this- >resource( ) - >allocate(n * sizeof(T), alignof(T) ) ) ;

Parameters

n - the number of objects to allocate storage for

Return value

A pointer to the allocated storage.

See also

[static]
allocates uninitialized storage using the allocator
(public static member function of std::allocator_traits<Alloc>)
deallocates memory
(public member function of std::experimental::pmr::memory_resource)