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delphiprocedureforward-declaration
Seatless
Seatless

Reputation: 193

forward declaration of procedure in delphi

How can I make a forward declaration of a procedure in Delphi and make it's implementation in other place? I want to do something like this C's code but in Delphi:

void FooBar();

void FooBar()
{
    // Do something
}

Upvotes: 8

Views: 10530

Answers (2)

LU RD
LU RD

Reputation: 34909

Here is one way of doing it, through the interface/implementation part of a unit.

Unit YourUnit;

Interface

  procedure FooBar();  // procedure declaration


Implementation

// Here you can reference the procedure FooBar()

procedure FooBar();
begin
  // Implement your procedure here
end;

You should also take a look into the documentation about forward declarations, where another option is mentioned, like @MasonWheeler answered.

Upvotes: 6

Mason Wheeler
Mason Wheeler

Reputation: 84550

You do that with the forward directive, like so:

procedure FooBar(); forward;

...
//later on

procedure FooBar()
begin
    // Do something
end;

This is only necessary if you're declaring it as an internal function. (ie. already inside the implementation section of your unit.) Anything declared as a method of a class, or in the interface section of the unit, is automatically understood to be forward-declared.

Upvotes: 22

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