[C ++ 11] Appendix B- reload

Parameter Type

#include <iostream>
using namespace  std;

class Xer{
public :
    Xer(int x) { cout << "call Xer(int):" << x << endl; }
};

int f1(int) { cout << "call int f1(int)" << endl; return 0; }//1
int f1(double) { cout << "call int f1(double)" << endl; return 0; }//2

int f2(int) { cout << "call int f2(int)" << endl; return 0; }//3
int f2(char) { cout << "call int f1(char)" << endl; return 0; }//4

int f3(Xer) { cout << "call int f3(X)" << endl; return 0; }//5
int f3(...) { cout << "call int f3(...)" << endl; return 0; }//6

int main()
{
    f1(4);//1:精确匹配
    f2(true);//3:发生提升的匹配,true是bool类型,而4要求强制类型转换
    f3(5);//5:调用用户自定义类型的转换的匹配,而6要求和省略号进行匹配
    return 0;
}

const type

Non-template priority

Transition Sequence

class Base {
public:
    operator short()const
    {
        cout << "Base operator()" << endl;
        return 3;
    }
};

class Drived : public Base {

};

void count(int x)
{
    cout << "call count x" << x << endl;
}
void process(Drived const& x)
{
    count(x);
}
int main()
{
    Drived d;
    process(d);
    return 0;
}