Type Alias JSObjectGetPropertyCallback

pub type JSObjectGetPropertyCallback = Option<unsafe extern "C" fn(ctx: JSContextRef, object: JSObjectRef, propertyName: JSStringRef, exception: *mut JSValueRef) -> *const OpaqueJSValue>;

The callback invoked when getting a property’s value.

• ctx: The execution context to use.
• object: The JSObjectRef to search for the property.
• propertyName: A JSStringRef containing the name of the property to get.
• exception: A pointer to a JSValueRef in which to return an exception, if any.

Returns the property’s value if object has the property, otherwise NULL.

If you named your function GetProperty, you would declare it like this:

JSValueRef
GetProperty(JSContextRef ctx, JSObjectRef object,
            JSStringRef propertyName, JSValueRef* exception);

If this function returns NULL, the get request forwards to object’s statically declared properties, then its parent class chain (which includes the default object class), then its prototype chain.

See also

• JSClassDefinition::getProperty
• JSObjectDeletePropertyCallback
• JSObjectHasPropertyCallback
• JSObjectSetPropertyCallback
• JSObjectGetProperty()

Aliased Type

pub enum JSObjectGetPropertyCallback {
    None,
    Some(unsafe extern "C" fn(*const OpaqueJSContext, *mut OpaqueJSValue, *mut OpaqueJSString, *mut *const OpaqueJSValue) -> *const OpaqueJSValue),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*const OpaqueJSContext, *mut OpaqueJSValue, *mut OpaqueJSString, *mut *const OpaqueJSValue) -> *const OpaqueJSValue)

Some value of type T.