Vocabulary
alien.syntax

Syntax

CALLBACK: return type ( parameters ) ;

Inputs and outputs

return	a C return type
type	a type name
parameters	a comma-separated sequence of type/name pairs; type1 arg1, type2 arg2, ...

Word description
Defines a new function pointer C type word type. The newly defined word works both as a C type and as a wrapper for alien-callback for callbacks that accept the given return type and parameters. The ABI of the callback is decided from the ABI of the active LIBRARY: declaration.

Examples

CALLBACK: bool FakeCallback ( int message, void* payload ) ; : MyFakeCallback ( -- alien ) [| message payload | "message #" write message number>string write " received" write nl t ] FakeCallback ;

Definition

USING: alien.parser words ;

IN: alien.syntax

SYNTAX: CALLBACK: (CALLBACK:) define-inline ;