042-partial_type.cpp

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#include <iostream>
 
template<typename ElementTypeB> class TypeB;
 
template<typename ElementTypeA>
class TypeA
{
    template<typename ElementTypeB> friend class TypeB;
 
    private:
        ElementTypeA m_data{};
 
    public:
    
    template<typename ElementTypeB>
    void operation_over_type_b(TypeB<ElementTypeB> b);
};
 
template<typename ElementTypeB>
class TypeB
{
    template<typename ElementTypeA> friend class TypeA;
 
    private:
        ElementTypeB m_data{};
    
    public:
 
    template<typename ElementTypeA>
    void operation_over_type_a(TypeA<ElementTypeA> a)
    {
        std::cout << a.m_data << std::endl;
    }
 
};
 
template<typename ElementTypeA>
    template<typename ElementTypeB>
void TypeA<ElementTypeA>::operation_over_type_b(TypeB<ElementTypeB> b)
{
    std::cout << b.m_data << std::endl;
}
 
int main()
{
    TypeA<int> a;
    
    TypeB<int> b;
 
    a.operation_over_type_b(b);
 
    b.operation_over_type_a(a);
}