小编ria*_*mat的帖子

我定义了一个类foo如下:

class foo {
private:
   static int objcnt;
public:
   foo() {
       if(objcnt==8)
           throw outOfMemory("No more space!");
       else
          objcnt++;
   }

   class outOfMemory {
   public:
       outOfMemory(char* msg) { cout << msg << endl;}
   };

   ~foo() { cout << "Deleting foo." << endl; objcnt--;}
};
int foo::objcnt = 0;

这是主要功能:

int main() {
    try {
            foo* p = new foo[3];
            cout << "p in try " << p << endl;
            foo* q = new foo[7];
        }catch(foo::outOfMemory& o) {
           cout << "Out-of-memory Exception Caught." …

例如，我想定义一个这样的函数：

(defun operation (op)
  (op 3 7))

但是 lisp 编译器会抱怨这样的代码： (operation +)

有没有办法将算术运算符作为函数参数传递？