Quick start manual

Procedures and functions

6-21

You can omit parentheses when passing all and only the default parameters to a

routine. For example, given the procedure

procedure DoSomething(X: Real = 1.0; I: Integer = 0; S: string = '');

the following calls are equivalent.

DoSomething();

DoSomething;

Open array constructors

Open array constructors allow you to construct arrays directly within function and

procedure calls. They can be passed only as open array parameters or variant open

array parameters.

An open array constructor, like a set constructor, is a sequence of expressions

separated by commas and enclosed in brackets.

For example, given the declarations

var I, J: Integer;

procedure Add(A: array of Integer);

you could call the Add procedure with the statement

Add([5, 7, I, I + J]);

This is equivalent to

var Temp: array[0..3] of Integer;

Temp[0] := 5;

Temp[1] := 7;

Temp[2] := I;

Temp[3] := I + J;

Add(Temp);

Open array constructors can be passed only as value or const parameters. The

expressions in a constructor must be assignment-compatible with the base type of the

array parameter. In the case of a variant open array parameter, the expressions can be

of different types.