実験により、Objective-C++はARCを完璧にサポートしていることが証明された.

XCode 4.2からObjective-CサポートARCは、多くのiPone開発者にとって大きな福音であり、フルスクリーン[obj release]や[pool drain]のような醜いコードに直面する必要はありません.さらに重要なのは、一日中対象として問題を解放して寝食を安定させる必要はありません.しかし、C++からObjCに移行した多くの開発者にとって、実はObj-C++ミキシングが好きです.Cocoaはインタフェースの展示を担当し、C++は業務ロジックの実現を担当し、組み合わせは非常に完璧である.
問題はObj-C++がARCを完璧にサポートできるかどうかです.特にObjcCオブジェクトをSTL容器に入れた場合、正常に動作しますか?
おめでとうございます.答えは肯定的です.
 
テストコード1:

#import <vector>
#import <list>
using namespace std;

class Y
{
public:
    int value;
    
public:
    Y(int val = 0) : value(val)
    {
        NSLog(@"Y.Y        (%d)", value);
    }
    
    ~Y()
    {
        NSLog(@"Y.~Y        (%d)", value);
    }
};

@interface T : NSObject {
@private
    int value;
    Y* y;
}

- (id) initWithValue:(int)v;
@end

@implementation T

- (id) init
{
    return [self initWithValue:0];
}

- (id) initWithValue:(int)v
{
    self = [super init];
    self->value = v;
    self->y = new Y(v);
    
    NSLog(@"T.init        (%d)", self->value);
    return self;
}

- (void)dealloc
{
    delete self->y;
    
    NSLog(@"T.dealloc    (%d)", self->value);
}

@end

class X
{
public:
    int value;
    T* t;
    
public:
    X(int val = 0) : value(val)
    {
        NSLog(@"X.X        (%d)", value);
    }
    
    ~X()
    {
        NSLog(@"X.~X        (%d)", value);
    }
};

int main(int argc, char *argv[])
{
    @autoreleasepool
    {
        T* t = [[T alloc] initWithValue:1];

        {
            vector<T*> vt;
            vt.push_back(t);
            t = nil;
            vt.push_back([[T alloc] initWithValue:2]);
            vt.push_back([[T alloc] initWithValue:3]);
            
            {
                //vt.pop_back();
                vt.erase(vt.begin());
                NSLog(@"< first element had been dealloc >");
            }
            
            {
                vt.clear();
                NSLog(@"< all other elements had been dealloc >");
            }
        }
    }
}

出力結果:

2012-02-11 19:31:56.256 Switcher[3037:f803] Y.Y        (1)
2012-02-11 19:31:56.258 Switcher[3037:f803] T.init        (1)
2012-02-11 19:31:57.352 Switcher[3037:f803] Y.Y        (2)
2012-02-11 19:31:57.353 Switcher[3037:f803] T.init        (2)
2012-02-11 19:31:57.578 Switcher[3037:f803] Y.Y        (3)
2012-02-11 19:31:57.579 Switcher[3037:f803] T.init        (3)
2012-02-11 19:31:57.786 Switcher[3037:f803] Y.~Y        (1)
2012-02-11 19:31:57.787 Switcher[3037:f803] T.dealloc    (1)
2012-02-11 19:31:58.894 Switcher[3037:f803] < first element had been dealloc >
2012-02-11 19:32:05.227 Switcher[3037:f803] Y.~Y        (2)
2012-02-11 19:32:05.228 Switcher[3037:f803] T.dealloc    (2)
2012-02-11 19:32:05.229 Switcher[3037:f803] Y.~Y        (3)
2012-02-11 19:32:05.230 Switcher[3037:f803] T.dealloc    (3)
2012-02-11 19:32:07.787 Switcher[3037:f803] < other elements had been dealloc >

 
テストコード2:

int main(int argc, char *argv[])
{
    @autoreleasepool
    {
        X* x = new X(1);
        x->t = [[T alloc] initWithValue:1];

        {
            list<X*> vx;
            
            vx.push_back(x);
            vx.push_back(new X(2, [[T alloc] initWithValue:2]));
            vx.push_back(new X(3, [[T alloc] initWithValue:3]));
            
            {
                X* x2 = vx.front();
                vx.pop_front();
                delete x2;
                
                NSLog(@"< first element had been dealloc >");
            }
            
            {
                for(list<X*>::iterator it = vx.begin(); it != vx.end(); ++it)
                    delete (*it);            
                
                NSLog(@"< all other elements had been dealloc >");
            }
            
            vx.clear();
        }
    }
}

 
出力結果:

2012-02-12 02:34:13.403 Switcher[3142:f803] X.X        (1)
2012-02-12 02:34:14.516 Switcher[3142:f803] Y.Y        (1)
2012-02-12 02:34:14.517 Switcher[3142:f803] T.init        (1)
2012-02-12 02:34:26.171 Switcher[3142:f803] Y.Y        (2)
2012-02-12 02:34:26.171 Switcher[3142:f803] T.init        (2)
2012-02-12 02:34:26.174 Switcher[3142:f803] X.X        (2)
2012-02-12 02:34:42.481 Switcher[3142:f803] Y.Y        (3)
2012-02-12 02:34:42.481 Switcher[3142:f803] T.init        (3)
2012-02-12 02:34:42.484 Switcher[3142:f803] X.X        (3)
2012-02-12 02:34:48.856 Switcher[3142:f803] X.~X        (1)
2012-02-12 02:34:48.857 Switcher[3142:f803] Y.~Y        (1)
2012-02-12 02:34:48.858 Switcher[3142:f803] T.dealloc    (1)
2012-02-12 02:35:02.491 Switcher[3142:f803] < first element had been dealloc >
2012-02-12 02:35:07.303 Switcher[3142:f803] X.~X        (2)
2012-02-12 02:35:07.303 Switcher[3142:f803] Y.~Y        (2)
2012-02-12 02:35:07.304 Switcher[3142:f803] T.dealloc    (2)
2012-02-12 02:35:09.319 Switcher[3142:f803] X.~X        (3)
2012-02-12 02:35:09.320 Switcher[3142:f803] Y.~Y        (3)
2012-02-12 02:35:09.321 Switcher[3142:f803] T.dealloc    (3)
2012-02-12 02:35:11.268 Switcher[3142:f803] < all other elements had been dealloc >

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