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1#import <Foundation/Foundation.h>2#include <stdio.h>3 4@interface MyString : NSObject {5 NSString *str;6 NSDate *date;7 BOOL _is_valid;8}9 10- (id)initWithNSString:(NSString *)string;11- (BOOL)isValid;12@end13 14@implementation MyString15- (id)initWithNSString:(NSString *)string16{17 if (self = [super init])18 {19 str = [NSString stringWithString:string];20 date = [NSDate date];21 }22 _is_valid = YES;23 return self;24}25 26- (BOOL)isValid27{28 return _is_valid;29}30 31- (void)dealloc32{33 [date release];34 [str release];35 [super dealloc];36}37 38- (NSString *)description39{40 return [str stringByAppendingFormat:@" with timestamp: %@", date];41}42@end43 44void45Test_MyString (const char *program)46{47 NSString *str = [NSString stringWithFormat:@"Hello from '%s'", program];48 MyString *my = [[MyString alloc] initWithNSString:str];49 if ([my isValid])50 printf("my is valid!\n");51 52 NSLog(@"NSString instance: %@", [str description]); // Set breakpoint here.53 // Test 'p (int)[my isValid]'.54 // The expression parser should not crash -- rdar://problem/9691614.55 56 NSLog(@"MyString instance: %@", [my description]);57}58 59int main (int argc, char const *argv[])60{61 NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];62 63 Test_MyString (argv[0]);64 65 [pool release];66 return 0;67}68