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//
// 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
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