ARCとMRCを混ぜながらプログラムを書くための方法とその調査報告 ref: http://qiita.com/omochi@github/items/f27022d31e9914af30b8

file0.txt

How do I think about ARC? Where does it put the retains/releases?

Try to stop thinking about where the retain/release calls are put and think about your application algorithms instead. Think about “strong and weak” pointers in your objects, about object ownership, and about possible retain cycles.

file1.txt

-(BOOL)doSomethingWithError:(NSError *__autoreleasing *)error{
    for(int i=0;i<10000;i++){
        @autoreleasepool{
            if(![self doSmallTask]){
                if(error) *error = [self makeError];
                return NO;
            }
        }
    }
    return YES;
}

file10.txt

NSLog(@"--- 5");
@autoreleasepool {
    if(YES){
        AMMARCClass * __strong f = [AMMARCClass makeRetainedWithName:@"fish"];
        AMMARCClass * __strong g = [AMMARCClass makeRetainedAnnotatedWithName:@"girl"];
        (void)f,(void)g;
    }
    NSLog(@"--- 6");
}
NSLog(@"--- 7");

file11.txt

--- 5
ARC fish init
ARC girl init
ARC girl dealloc
--- 6
ARC fish dealloc
--- 7

file12.txt

NSLog(@"--- 8");
@autoreleasepool {
    if(YES){
        AMMARCClass * h = [[[AMMARCClass alloc]initWithName:@"house"]autorelease];
        AMMARCClass * i = [AMMARCClass makeRetainedWithName:@"ion"];
        AMMARCClass * j = [AMMARCClass makeRetainedAnnotatedWithName:@"joke"];
        (void)h,(void)i,(void)j;
        [j release];
    }
    NSLog(@"--- 9");
}
NSLog(@"--- 10");

file13.txt

--- 8
ARC house init
ARC ion init
ARC joke init
ARC joke dealloc
--- 9
ARC ion dealloc
ARC house dealloc
--- 10

file14.txt

NSLog(@"--- 11");
@autoreleasepool {
    if(YES) {
        (void)[[AMMARCClass alloc]initWithName:@"knight"];
        [AMMARCClass makeRetainedWithName:@"lime"];
        [AMMARCClass makeRetainedAnnotatedWithName:@"money"];
        (void)[[AMMMRCClass alloc]initWithName:@"nuke"];
        [AMMMRCClass makeRetainedWithName:@"ocean"];
        [AMMMRCClass makeRetainedAnnotatedWithName:@"pine"];
    }
    NSLog(@"--- 12");
}
NSLog(@"--- 13");

file15.txt

--- 11
ARC knight init
ARC knight dealloc
ARC lime init
ARC money init
ARC money dealloc
MRC nuke init
MRC nuke dealloc
MRC ocean init
MRC pine init
MRC pine dealloc
--- 12
ARC lime dealloc
--- 13

file2.txt

@implementation AMMARCClass

-(id)initWithName:(NSString *)name{
    self = [super init];
    if(self){
        NSLog(@"ARC %@ init",name);
        _name = name;
    }
    return self;
}

- (void)dealloc{
    NSLog(@"ARC %@ dealloc",self.name);
}
@end

file3.txt

@implementation AMMMRCClass

-(id)initWithName:(NSString *)name{
    self = [super init];
    if(self){
        NSLog(@"MRC %@ init",name);
        _name = [name retain];
    }
    return self;
}

- (void)dealloc
{
    NSLog(@"MRC %@ dealloc",self.name);
    [_name release];
    [super dealloc];
}

file4.txt

NSLog(@"--- 1");
@autoreleasepool {
    if(YES){
        AMMARCClass * __strong a = [[AMMARCClass alloc]initWithName:@"apple"];
        AMMARCClass * __autoreleasing b = [[AMMARCClass alloc]initWithName:@"banana"];
        (void)a,(void)b;
    }
    NSLog(@"--- 2");
}
NSLog(@"--- 3");

file5.txt

--- 1
ARC apple init
ARC banana init
ARC apple dealloc
--- 2
ARC banana dealloc
--- 3

file6.txt

@interface AMMMRCClass : NSObject
+(AMMMRCClass *)makeRetainedWithName:(NSString *)name;
+(AMMMRCClass *)makeRetainedAnnotatedWithName:(NSString *)name NS_RETURNS_RETAINED;
@end
@implementation AMMMRCClass
+(AMMMRCClass *)makeRetainedWithName:(NSString *)name{
    return [[AMMMRCClass alloc]initWithName:name];
}
+(AMMMRCClass *)makeRetainedAnnotatedWithName:(NSString *)name{
    return [[AMMMRCClass alloc]initWithName:name];
}
@end

file7.txt

NSLog(@"--- 3");
@autoreleasepool {
    if(YES){
        AMMMRCClass * __strong c = [[AMMMRCClass alloc]initWithName:@"cherry"];
        AMMMRCClass * __strong d = [AMMMRCClass makeRetainedWithName:@"doll"];
        AMMMRCClass * __strong e = [AMMMRCClass makeRetainedAnnotatedWithName:@"eye"];
        (void)c,(void)d,(void)e;
    }
    NSLog(@"--- 4");
}
NSLog(@"--- 5");

file8.txt

--- 3
MRC cherry init
MRC doll init
MRC eye init
MRC eye dealloc
MRC cherry dealloc
--- 4
--- 5

file9.txt

@interface AMMARCClass : NSObject
+(AMMARCClass *)makeRetainedWithName:(NSString *)name;
+(AMMARCClass *)makeRetainedAnnotatedWithName:(NSString *)name NS_RETURNS_RETAINED;
@end
@implementation AMMARCClass
+(AMMMRCClass *)makeRetainedWithName:(NSString *)name{
    return [[AMMMRCClass alloc]initWithName:name];
}
+(AMMMRCClass *)makeRetainedAnnotatedWithName:(NSString *)name{
    return [[AMMMRCClass alloc]initWithName:name];
}
@end