c++ - 一个类对象到另一个数据类型？

Question

能否将类对象转换为 int、double、char 等。它是隐式转换还是显式转换？

class MyClass
{
int x;
};

int main()
{
    MyClass MyObject; //convert my object to int
}

Answer 1

创建一个转换运算符:

class Foo {
public:
    operator int() const { return 1; }
};

class Bar {
public:
    operator Foo() const { return Foo(); }
};


int main() {
    Foo f;
    Bar b;
    int i1 = f; // implicit, just one conversion
    int i2 = b; // not valid
    int i3 =  static_cast<Foo>(b); // Convert b to Foo explicitly, Foo to int implicitly
}