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50 lines
930 B
50 lines
930 B
/*
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* Copyright (c) 2014 - present Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import <Foundation/Foundation.h>
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@interface A : NSObject
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@property int x;
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+ (instancetype)sharedInstance;
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@end
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@implementation A {
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}
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+ (instancetype)sharedInstance {
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static dispatch_once_t once;
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static id sharedInstance;
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dispatch_once(&once, ^{
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sharedInstance = [[self alloc] init];
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});
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return sharedInstance;
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}
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+ (instancetype)trans {
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static id sharedInstance;
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void (^dummy_block)() = ^{
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sharedInstance = [[self alloc] init];
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};
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dummy_block();
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return sharedInstance;
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}
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@end
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int main() {
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A* b = [A sharedInstance];
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int* p = 0;
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if (b == 0)
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return *p;
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else
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return 0;
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}
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