Type Definition ul_sys::JSObjectConvertToTypeCallback

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

@typedef JSObjectConvertToTypeCallback @abstract The callback invoked when converting an object to a particular JavaScript type. @param ctx The execution context to use. @param object The JSObject to convert. @param type A JSType specifying the JavaScript type to convert to. @param exception A pointer to a JSValueRef in which to return an exception, if any. @result The objects's converted value, or NULL if the object was not converted. @discussion If you named your function ConvertToType, you would declare it like this:

JSValueRef ConvertToType(JSContextRef ctx, JSObjectRef object, JSType type, JSValueRef* exception);

If this function returns false, the conversion request forwards to object's parent class chain (which includes the default object class).

This function is only invoked when converting an object to number or string. An object converted to boolean is 'true.' An object converted to object is itself.