我试图回答关于==操作符的另一个问题,我创造了这个代码:编译器是否优化了字符串的形成?
NSString *aString = @"Hello";
NSString *bString = aString;
NSString *cString = @"Hello";
if (aString == bString)
NSLog(@"CHECK 1");
if (bString == cString)
NSLog(@"CHECK 2");
if ([aString isEqual:bString])
NSLog(@"CHECK 3");
if ([aString isEqual:cString])
NSLog(@"CHECK 4");
NSLog(@"%i", aString);
NSLog(@"%i", bString);
NSLog(@"%i", cString);
却惊讶的结果:
Equal[6599:10b] CHECK 1
Equal[6599:10b] CHECK 2
Equal[6599:10b] CHECK 3
Equal[6599:10b] CHECK 4
Equal[6599:10b] 8240
Equal[6599:10b] 8240
Equal[6599:10b] 8240
是有一些编译器弄虚作假回事?
+1优秀的答案,jayw。 – 2009-08-24 17:53:54