Does OCaml have the ability to pass by reference?

Question

In C++ a program can pass a reference, not value to a function.

void incrementInt(int &x) 
{
  ++x;
}

Does OCaml offer this same functionality?

Answer 1

No, there is no strict equivalent.

There are refs, which are like pointers to new-allocated memory, and there are records, arrays, objects and values of other compound data types, that are passed "by object reference", which again means they act like pointer to new-allocated memory.

However there's no equivalent to a pointer to a variable or a C++ reference.