駄文 - 毎日 XPathGraph を見るのが楽しい
ちょっとずつできあがってきた
http://xpath.kayac.com/user/amachang
Objective-C めも
Hello world!
#import <stdio.h> #import <objc/Object.h> @interface Test : Object - (void) msg; @end @implementation Test - (void) msg { printf("Hello world!\n"); } @end int main(int argc, char** argv) { id obj = [Test alloc]; [obj msg]; return 0; }
$ gcc hello.m -lobjc
NSString を使ってみる
#import <stdio.h> #import <objc/Object.h> #import <Foundation/NSString.h> @interface Test : Object { id name; } - (void) msg; @end @implementation Test - (void) setName:(NSString*)name_ { [name release]; name = name_; } - (void) msg { NSLog(@"Hello %@!\n", name); } @end int main(int argc, char** argv) { id obj0 = [Test alloc]; [obj0 setName:@"amachang"]; id obj1 = [Test alloc]; [obj1 setName:@"prochang"]; [obj0 msg]; [obj1 msg]; return 0; }
$ gcc hello.m -lobjc -framework Foundation
Object より NSObject のほうがいいのかな?
- Object で release を呼び出してみると warning が出た
- NSObject にしたら大丈夫だった
NSAutoreleasePool と autorelease
#import <Foundation/NSObject.h> #import <Foundation/NSAutoreleasePool.h> @interface Foo : NSObject @end @implementation Foo -(void) dealloc { NSLog(@"dealloc Foo"); [super dealloc]; } @end int main(int argc, char** argv) { id arp = [[NSAutoreleasePool alloc] init]; id obj0 = [[Foo alloc] init]; [obj0 autorelease]; id obj1 = [[Foo alloc] init]; [obj1 autorelease]; NSLog(@"release arp"); [arp release]; return 0; }
$ gcc hello.m -lobjc -framework Foundation && ./a.out 2008-04-21 17:20:03.198 a.out[30050:10b] release arp 2008-04-21 17:20:03.200 a.out[30050:10b] dealloc Foo 2008-04-21 17:20:03.201 a.out[30050:10b] dealloc Foo
ダックタイピング
#import <Foundation/NSObject.h> #import <Foundation/NSAutoreleasePool.h> @interface Foo : NSObject @end @implementation Foo -(id) msg { NSLog(@"foo"); return self; } @end @interface Bar : NSObject @end @implementation Bar -(id) msg { NSLog(@"bar"); return self; } @end int main(int argc, char** argv) { srand(time(NULL)); [[[[rand()%2 ? [Foo class] : [Bar class] alloc] init] msg] release]; return 0; }