//
|
// DTWeakSupport.h
|
// DTFoundation
|
//
|
// Created by Oliver Drobnik on 6/3/13.
|
// Copyright (c) 2013 Cocoanetics. All rights reserved.
|
//
|
|
/**
|
Useful defines for building code the compiles with zeroing weak references if the deployment target allows it. This is possible from minimum supported iOS 5.0 and OS X 10.7 and above. Note that on OS X 10.7 some AppKit classes do not support having a weak ref, e.g. NSWindowController or NSViewController.
|
*/
|
|
#import <Availability.h>
|
|
#if __has_feature(objc_arc_weak)
|
|
// zeroing weak refs are supported for ivars and properties
|
#define DT_WEAK_VARIABLE __weak
|
#define DT_WEAK_PROPERTY weak
|
|
#elif __has_feature(objc_arc)
|
|
/// zeroing weak refs not supported, fall back to unsafe unretained and assigning
|
#define DT_WEAK_VARIABLE __unsafe_unretained
|
#define DT_WEAK_PROPERTY assign
|
|
#else
|
|
// define something, as this header might be included in a non-ARC project for using compiled code from an ARC static lib
|
#define DT_WEAK_VARIABLE
|
#define DT_WEAK_PROPERTY assign
|
|
#endif
|
