You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
56 lines
958 B
56 lines
958 B
/*
|
|
* Copyright (c) 2014 - present Facebook, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This source code is licensed under the BSD style license found in the
|
|
* LICENSE file in the root directory of this source tree. An additional grant
|
|
* of patent rights can be found in the PATENTS file in the same directory.
|
|
*/
|
|
|
|
#import <Foundation/Foundation.h>
|
|
|
|
@interface A : NSObject
|
|
|
|
@property int x;
|
|
|
|
+ (instancetype)sharedInstance;
|
|
|
|
@end
|
|
|
|
@implementation A {
|
|
}
|
|
|
|
+ (instancetype)sharedInstance
|
|
{
|
|
static dispatch_once_t once;
|
|
static id sharedInstance;
|
|
dispatch_once(&once, ^{
|
|
sharedInstance = [[self alloc] init];
|
|
});
|
|
return sharedInstance;
|
|
}
|
|
|
|
+ (instancetype)trans
|
|
{
|
|
static id sharedInstance;
|
|
void (^dummy_block)() = ^{
|
|
sharedInstance = [[self alloc] init];
|
|
};
|
|
dummy_block();
|
|
return sharedInstance;
|
|
}
|
|
@end
|
|
|
|
int main () {
|
|
A *b = [A sharedInstance];
|
|
int *p = 0;
|
|
if (b == 0) return *p;
|
|
else return 0;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|