Question

Code goes first:

//.h file

class A
{
    public:
        A();
        B makeB(int);  //question 1
    //protected:
        struct B {
            int _id;
            B(int id);
        }
};

//.cpp file

A::A()
{  cout<<"A ctor\n"; }

B A::makeB(int id)  //question 2
{  return B(id); }

2 questions:

1.Should I put makeB() function after the definition of struct B?

2.In .cpp file, should prefix every B with A:: ?

PS:
1.If makeB function doesn’t deal with B instances, but B pointers or refs, can I put a forward decl of struct B in front of makeB? (I just don’t want put the definition of struct B in front of mem-funcs).

Answer 1

This compiles fine:

class A
{
 public:
    struct B;

    A();
    B makeB(int);  //question 1

    struct B {
        int _id;
        B(int id) {};
    };
};

A::A() {}

A::B A::makeB(int id)  //question 2
{  return B(id); }