2 FFI Types and Constants

_id : ctype?

The type of an Objective-C object, an opaque pointer.

_Class : ctype?

The type of an Objective-C class, which is also an _id.

_SEL : ctype?

The type of an Objective-C selector, an opaque pointer.

_BOOL : ctype?

The Objective-C boolean type. Scheme values are converted for C in the usual way: #f is false and any other value is true. C values are converted to Scheme booleans.

YES : boolean?

Synonym for #t

NO : boolean?

Synonym for #f