▼ |  | Objective-C FFI

1 | Using Unsafe Bindings
2 | FFI Types and Constants
3 | Syntactic Forms
4 | Raw Runtime Functions

On this page:

_ id
_ Class
_ SEL
_ BOOL
YES
NO

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### 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
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