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Showing content from https://cplusplus.com/reference/deque/deque/get_allocator/ below:

public member function

<deque>

std::deque::get_allocator 
allocator_type get_allocator() const;
allocator_type get_allocator() const noexcept;

Get allocator

Returns a copy of the allocator object associated with the deque object.

Parameters none

Return Value The allocator.

Member type allocator_type is the type of the allocator used by the container, defined in deque as an alias of its second template parameter (Alloc).



Example 
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// deque::get_allocator
#include <iostream>
#include <deque>

int main ()
{
  std::deque<int> mydeque;
  int * p;
  unsigned int i;

  // allocate an array with space for 5 elements using deque's allocator:
  p = mydeque.get_allocator().allocate(5);

  // construct values in-place on the array:
  for (i=0; i<5; i++) mydeque.get_allocator().construct(&p[i],i);

  std::cout << "The allocated array contains:";
  for (i=0; i<5; i++) std::cout << ' ' << p[i];
  std::cout << '\n';

  // destroy and deallocate:
  for (i=0; i<5; i++) mydeque.get_allocator().destroy(&p[i]);
  mydeque.get_allocator().deallocate(p,5);

  return 0;
}
The example shows an elaborate way to allocate memory for an array of ints using the same allocator used by the deque object. Output: 
The allocated array contains: 0 1 2 3 4


Complexity Constant.

Iterator validity No changes.

Data races The container is accessed.
No contained elements are accessed: concurrently accessing or modifying them is safe.

Exception safetyNo-throw guarantee: this member function never throws exceptions.
Copying any instantiation of the default allocator is also guaranteed to never throw.

See also
allocator
Default allocator (class template)

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