c++中使用指针调用函数和使用指针调用类对象的（）重载函数

 1 1 //include directories...
 2  2 using namespace std;
 3  3 void testFun()
 4  4 {
 5  5     cout<<"this is a test"<<endl;
 6  6 }
 7  7 int main(int argc,char**argv)
 8  8 {
 9  9     auto *pFun=testFun;
10 10     pFun();//or (*pFun)() is also fine   
11 11 }

 1 1 //header files...
 2  2 using namespace std;
 3  3 class A
 4  4 {
 5  5 private:
 6  6     int a;
 7  7 public:
 8  8     A(int a_):a(a_){}
 9  9     void operator(){cout<<a<<endl;}
10 10 };
11 11 int main(int argc,char** argv)
12 12 {
13 13     A a1(5);
14 14     A *pA=new A(7);
15 15     a1();//correct using operator() function
16 16     (*pA)();//pA() is not correct
17 17 }