iphone - ARC 警告 - “删除未使用的自动释放不安全”

Question

我收到以下警告，但我不知道从哪里开始，有什么想法吗？

NSObject+Be.m:36:3: [rewriter] it is not safe to remove an unused 'autorelease' message; its receiver may be destroyed immediately
NSObject+Be.m:35:40: [rewriter] NSInvocation's getReturnValue is not safe to be used with an object with ownership other than __unsafe_unretained
NSObject+Be.m:36:4: ARC forbids explicit message send of 'autorelease'

代码来自这里.... https://github.com/tylerneylon/moriarty/blob/c0d6daf65d86c22b8e5853aef00980f059c92fbc/NSObject%2BBe.m

#import "NSObject+Be.h"

@interface BeProxy : NSProxy {
  id target;
}

+ (BeProxy *)beProxyForClass:(Class)class;

- (void)forwardInvocation:(NSInvocation *)anInvocation;
- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector;

@end

@implementation BeProxy

+ (BeProxy *)beProxyForClass:(Class)class {
  BeProxy *beProxy = [BeProxy alloc];
  beProxy->target = [class alloc];
  return beProxy;
}
//

// We assume the method called is an init method.  The return value
// may be a new value for self.
- (void)forwardInvocation:(NSInvocation *)anInvocation {
  [anInvocation setTarget:target];
  [anInvocation invoke];
  id object;
  [anInvocation getReturnValue:(void *)&object];   //HERE
  [object autorelease];                            //HERE
  [self release];
}

- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector {
  return [target methodSignatureForSelector:aSelector];
}

@end

//    


@implementation NSObject (Be)

+ (id)be {
  return [BeProxy beProxyForClass:[self class]];
}

+ (id)beInit {
  return [[[self class] new] autorelease];
}

- (id)beCopy {
  return [[self copy] autorelease];
}

@end

Answer 1

从文档中：

NSObject+Be 此类别旨在帮助进行内存管理。具体来说，这使得仅使用少数允许所有权的方法之外的自动释放对象变得容易。

所以发布的代码是为了帮助手动保留计数内存管理。那么不要用ARC编译它。