Type Alias GCallback

pub type GCallback = Option<unsafe extern "C" fn()>;

GCallback:

The type used for callback functions in structure definitions and function signatures.

This doesn’t mean that all callback functions must take no parameters and return void. The required signature of a callback function is determined by the context in which is used (e.g. the signal to which it is connected).

Use G_CALLBACK() to cast the callback function to a #GCallback.

Aliased Type

enum GCallback {
    None,
    Some(unsafe extern "C" fn()),
}

Variants

None

No value.

Some(unsafe extern "C" fn())

Some value of type T.