CODEWITHSUNDEEP
c++inheritance
yunate
yunate

Reputation: 79

C++ class Design with Inheritance

class Base 
{
public:
    static int  GetType_S()
    {
        return 1;
    }
    virtual int GetType()
    {
        return GetType_S();
    }
};

class Son1 : public Base 
{
public:
    static int GetType_S()
    {
        return 2;
    }
    virtual int GetType()
    {
        return GetType_S();
    }
};

My Question is : When I need some other classes like "Son1,Son2..." ,every class should implement GetType and GetType_S function, This two functions is repeated.So How to design this classes gracefully to let son classes implement only one function?And It is best not to use macros.

Upvotes: 0

Views: 109

Answers (1)

Caleth
Caleth

Reputation: 62694

You can have a class template that each SonN inherits from, which in turn inherits Base.

template <int Type>
class Middle : public Base 
{
public:
    static int  GetType_S()
    {
        return Type;
    }
    virtual int GetType()
    {
        return GetType_S();
    }
};

class Son1 : public Middle<2> {};

class Son2 : public Middle<3> {};

class Whatever : public Middle<42> {};

Or, if there is nothing else in those classes:

using Son1 = Middle<2>;
using Son2 = Middle<3>;
using Whatever = Middle<42>;

Upvotes: 1

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