What is the Delphi equivalent to C++ reference parameters?

Question

How do I write int &a in Delphi?

For example, in C++ it is void ABC(int &a, int &b), but I don't know how to write it in Delphi.

Answer 1

That is a reference parameter in C++. In Delphi that corresponds to a var parameter.

procedure ABC(var a: Integer; var b: Integer);

The documentation says:

Most parameters are either value parameters (the default) or variable (var) parameters. Value parameters are passed by value, while variable parameters are passed by reference.

Answer 2

void ABC(int &a, int &b)

would become

procedure ABC(var a: Integer; var b: Integer);

The var keyword indicates that you wish to pass the value by reference, rather than value.