NSDataOMGWTFBBQ

gistfile1.m

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    
    int *x = malloc(sizeof(int));
    void *foo = x;
    
    NSMutableData *d = [NSMutableData dataWithBytesNoCopy:foo length:sizeof(int) freeWhenDone:NO];
    
    NSLog(@"a: %p", [d mutableBytes]);
    NSLog(@"b: %p", foo);
    
    assert([d mutableBytes] == foo);
    
    free(x);
    
    [pool drain];
    return 0;
}