CALLBACK:
Factor handbook » C library interface » Passing data between Factor and C » C type specifiers

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Vocabulary
alien.syntax

Syntax

CALLBACK: return type ( parameters )

Inputs
None

Outputs
None

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" print t ] FakeCallback ;

Definition

USING: alien.parser words ;

IN: alien.syntax

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