Re: template parameters cannot be friends

[Eljay Love-Jensen <eljay at adobe dot com>]

Hi Naje,

With static polymorphism, I believe you should approach the problem this way:

- - - - - - - - - - - - -
#include <iostream>

class RadioButton
{
public:
    void Draw() const
    {
        std::cout<<"radio button"<<std::endl;
    }
};

class TextButton
{
public:
    void Draw() const
    {
        std::cout<<"text button"<<std::endl;
    }
};

template<typename T>
void Draw(T const& t)
{
    t.Draw();
}

int main()
{
    RadioButton rb;
    Draw(rb);
    TextButton tb;
    Draw(tb);
}
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You cannot have heterogenous collections of static polymorphic objects.

If you need a heterogenous collection of polymorphic objects, you need 
dynamic polymorphism.  (And, if so, I recommend using interface classes ... 
classes consisting of nothing but pure virtual methods.  I recommend 
interface classes as a rule-of-thumb.)

HTH,
--Eljay