双重自动转换功能定义，gcc错误：错误：预期的类型说明符

Question

I have a class with a conversion function in it.

class A {
  public:
    operator double() const;
};

Now I am defining it outside of the class defintion:

operator A::double() const { return 32.5; }

I am using MinGW with GCC4.7 on it and I am getting a error:

error: expected type-specifier

Anyone know what I am doing wrong?

Answer 1

You need a different order:

A::operator double() const {return 32.5;}
    ^The function name is "operator double"