Is it legal to initilize base class members in a derived class initilizer list?

This is a discussion on Is it legal to initilize base class members in a derived class initilizer list? within the C++ Programming forums, part of the General Programming Boards category; The title says it all. I have class surface_base with a single member: m_data, a pointer to raw surface data. ...

  1. #1
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    Is it legal to initialize base class members in a derived class initializer list?

    The title says it all. I have class surface_base with a single member: m_data, a pointer to raw surface data. class surface (derived from surface_base) adds some extra constructors which try to initilize m_data in the initilizer list...

    The error I get is "surface.hpp(39) : error C2614: 'surface' : illegal member initialization: 'm_data' is not a base or member" in MSVC++ 6.

    Either it's illegal to do this, or I have a syntax error somewhere else and the compiler is giving me misleading error messages.
    Last edited by Eibro; 12-12-2002 at 07:53 AM.

  2. #2
    Programming Sex-God Polymorphic OOP's Avatar
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    it's illegal -- you have to use one of the base class's constructors. You call the appropriate constructor in the initializer list just like you'd initialize a variable in a class IE

    Code:
    class A
    {
    public:
        A() {}
        A( int Init ) : Var( Init ) {}
    protected:
        int Var;
    };
    
    class B
        : public A
    {
    public:
        B() {}
        B( int A_Init, int B_Init ) : A( A_Init ), Var2( B_Init ) {}
    protected:
        int Var2;
    };

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