Type Definition jscjs_sys::api::JSObjectGetPropertyCallback

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

@typedef JSObjectGetPropertyCallback @abstract The callback invoked when getting a property’s value. @param ctx The execution context to use. @param object The JSObject to search for the property. @param propertyName A JSString containing the name of the property to get. @param exception A pointer to a JSValueRef in which to return an exception, if any. @result The property’s value if object has the property, otherwise NULL. @discussion 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.