Why Does Partial Specialization of Class Member Functions in C Require Specializing the Entire Class?

Partial Specialization of Class Member Functions in C

Partial specialization is a powerful technique in C templates that allows creating specialized versions of a class or function for specific types. When attempting partial specialization of a class member function, it's crucial to note that it involves specializing the entire class.

In the provided code, the goal is to partially specialize the Deform() member function for the class Object when nValue is 0. However, the code attempts to partially specialize only the member function without specializing the class, which leads to the error: "PartialSpecification_MemberFu.cpp(17): error: template argument list must match the parameter list Object& Object&::Deform()."

To rectify this error, it's necessary to specialize the entire class for nValue equal to 0. This involves creating a specialized class Object that overrides the Deform() member function with a specialized implementation:

template <typename T>
class Object<T, 0>
{
private:
    T m_t;
    Object();
public:
    Object(T t): m_t(t) {}
    T Get() { return m_t; }
    Object&amp; Deform()
    {
        std::cout << "Spec\n";
        m_t = -1;
        return *this;
    }
};

With this modification, the partial specialization of the Deform() member function works as intended. This correct approach ensures that the entire class is specialized when nValue is 0, enabling customized behavior specifically for that case.

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