我不知道这是否可行,但如果是这样,语法将如何?
如果不可能,为什么不呢?
解决方法
您应该能够绑定到消息实现(IMP),它们只是具有两个隐藏参数的简单C函数,分别为id和SEL类型的self和_cmd.
编辑:刚刚测试了以下完整的例子,它似乎工作.
#include <stdio.h>
#include <boost/bind.hpp>
#include <Foundation/NSObject.h>
@interface MyClass : NSObject
{
}
-(int) doSomething:(int)arg;
@end
@implementation MyClass
-(int) doSomething:(int)arg
{
printf("doSomething: self=0x%08x _cmd=0x%08x\n",self,_cmd);
return arg + 1;
}
@end
int main(void)
{
MyClass *myObj = [[MyClass alloc] init],*otherObj = [[MyClass alloc] init];
typedef int (*MyFunc)(id,SEL,int);
SEL doSomething_sel = @selector(doSomething:);
MyFunc doSomething_impl = (MyFunc)[myObj methodForSelector:doSomething_sel];
// bind self & _cmd arguments:
// calls [myObj doSomething:x]
int result = boost::bind(doSomething_impl,myObj,doSomething_sel,_1)(14);
printf("result1: %d\n",result);
// bind _cmd & arg:
// calls [otherObj doSomething:3]
result = boost::bind(doSomething_impl,_1,42)(otherObj);
printf("result2: %d\n",result);
return 0;
}
用GNUstep编译为:
gcc objcbind.mm -o objcbind -I/usr/include/GNUstep -lobjc -lstdc++ -lgnustep-base
在Mac OS X上,编译为:
gcc objcbind.mm -o objcbind -framework Foundation -lstdc++
输出:
doSomething: self=0x01a85f70 _cmd=0x00602220 result1: 15 doSomething: self=0x01a83d70 _cmd=0x00602220 result2: 43