Re: const pointer to class problem

Any member function which *may* alter the object cannot be called with
a const object - otherwise constness is violated.
You should tell the compiler that Version doesn' modify FOO:

       int Version(void) const {return m_ver;};
--------------------------^

In your example the compiler could determine the constness, but if
there is only a declaration in the header:

       int Version(void);

and the definition is in another source.cpp

int FOO::Version(void)
    {
    return m_ver;
    }

it is not possible to check constness.

Declaring the member function "const" will give you an Error if you
try to change the object:

       int Version(void) const {return m_ver++;};
- Error here ------------------------------^

therefore declaring member functions const if they may not alter the
object is always a good idea.

F.Hoerner

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