ReversibleString（81）

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#import <Foundation/NSString.h>#import <Foundation/NSMethodSignature.h>#import <Foundation/NSInvocation.h>#import <stdio.h>#import <stdlib.h>@interface ReversibleString:NSObject {    NSString *content;}- (id)initWithString:(NSString *)string;- (id)reversedString;@end@implementation ReversibleString- (id)initWithString:(NSString *)string {    if ((self = [super init]) != nil)        content = string;    return self;}- (id)reversedString {    unichar *buffer; //将Unicode字符串反转    int length, i, j, tmp;    id reversed;        if ((length = (int)[content length]) <= 0)        return @"";    buffer = malloc(sizeof(unichar) * length);    [content getCharacters:buffer range:NSMakeRange(0, length)];    for (i = 0,j = length - 1; i < j; i++, j--)        tmp = buffer[i], buffer[i] = buffer[j], buffer[j] = tmp;    reversed = [NSString stringWithCharacters:buffer length:length];            free(buffer);    return reversed;}- (void)forwardInvocation:(NSInvocation *)anInvocation {    SEL sel = [anInvocation selector];    if ([content respondsToSelector:sel])        [anInvocation invokeWithTarget:content];    else        [super forwardInvocation:anInvocation];}- (BOOL)respondsToSelector:(SEL)aSelector {    if ([super respondsToSelector:aSelector])        return YES;    if ([self methodForSelector:aSelector] != (IMP)NULL)        return YES;    if ([content respondsToSelector:aSelector])        return YES;    return NO;}- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector {    if ([super respondsToSelector:aSelector])        return [super methodSignatureForSelector:aSelector];    return [content methodSignatureForSelector:aSelector];}@endint main(void) {    char buf[100];    id s, a, b, c, d, e;    @autoreleasepool {        scanf("%s", buf);        s = [NSString stringWithUTF8String:buf];        a = [[ReversibleString alloc] initWithString:s];        b = [[ReversibleString alloc] initWithString:@"Reverse?"];        printf("%s\n", [a UTF8String]);        c = [[a reversedString] stringByAppendingString:b];        printf("%s\n", [c UTF8String]);        d = [[ReversibleString alloc] initWithString:c];        e = [b stringByAppendingString:[d reversedString]];        printf("%s\n", [e UTF8String]);    }    return 0;}
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