cc24a_c++_转换函数operator int

c++ cc24a_demo //转换函数，用来做转换操作符,int()括号里面必须是空的，必须定义为const,代码示范

#include 
#include 
using namespace std;

class Dog
{
public:
    Dog(string n, int a, double w) :name(n), age(a), weight(w) {}
    operator int() const//转换函数，用来做转化操作符,int()括号里面必须是空的，必须定义为const
    {
        return age;
    }
    operator double() const//转换函数
    {
        return weight;
    }
    operator std::string() const//转换函数
    {
        return name;
    }
private:
    int age;
    double weight;
    string name;
};

int main()
{
    int a, b;
    a = 10;
    b = a;
    Dog d("Bill",6,15.0);
    b = d; //d得到的是整形，调用转换函数，operator int()
    cout