Hi There,

If you declare this:

procedure proc(param: array of const);
Then you can pass any type of varaible to param, however, only in an array,
such as proc([1, 2]);

Is it possible to achieve the effect of the code below (which is wrong):

procedure proc(p1: const; p2: const);

So that: 1) p1 and p2 is translated by the compiler to TVarRec inside the function; 2) I do not need to pass an array to the function, in another word, the number of params for the procedure is *fixed*, but the *type* of each param is not.

Regards,
Xiangrong

Use variants:

Procedure Proc (Var A,B : variant);

Michael.

Thanks, this works, sort of. But does not meet my needs, I will pass in either an int value or an object, but Variant is not compatible with TObject.

Alternatively, this also does NOT work: array [0..1] of const; no matter it is a type definition or used as function parameter.

This is a trivial problem, I can just go with array of const, I am just curious if pascal can do this, because it will make the function definition more strict and my code cleaner.

Regards,
Xiangrong

2013/9/24 Michael Van Canneyt

Xiangrong Fang wrote

Thanks,  this works, sort of.  But does not meet my needs, I will pass in either an int value or an object, but Variant is not compatible with TObject.

You could make it so using a custom variant manager or operator overloading, but this requires additional work.

Michael.