C++——转换构造函数和转换运算符

1.转换构造函数

struct A
{
    public:
        A(int i);
};
A a=10;

2.转换运算符

struct A
{
    double value;
    public:
        A(int i);
        operator double()
        {
            return value;
        }
};
A a(10);
double i=a;