[Solved] C++: Abstract classes inheritance and construction

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Because you are passing the classes by const reference, I assume you want to copy them. For that you will need additional virtual member function clone which will return a pointer to a dynamically allocated copy of the object.

class func {
    ...
    virtual func* clone() const;
    ...
};

class polynom: public func {
    ...
    virtual polynom* clone() const override {
        return new polynom(n_, coefs_);
    }
    ...
};

class compfunc: public func {
    ...
    compfunc(const func& outter, const func& inner): outer_(outter.clone()), inner_(inner.clone()) {}
    ...
    virtual compfunc* clone() const override {
        ...
    }
};

This way you can copy the passed objects regardless of their dynamic type.

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solved C++: Abstract classes inheritance and construction