How to control the chunk size of `std::deque` when allocating a new chunk?

Question

When we insert a new element into a std::deque, it may allocate a new chunk to contain the element if the existing chunks are all full.

However, how doe

Answer 1

This is a chosen value of the implementation, and there is no control over it.

For example Microsoft choose values of 16 or smaller for the number of elements in a block. (Search for _DEQUESIZ).