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Can Member Functions Be Partially Specialized in Class Templates?

Barbara Streisand
Barbara StreisandOriginal
2024-11-04 18:48:02707browse

Can Member Functions Be Partially Specialized in Class Templates?

Member Function Specialization in Class Templates

Partial specialization, allowing for the modification of specific members in a template class, is not supported for member functions. This means that code like the following will not compile:

<code class="cpp">template <typename T, bool B>
struct X
{
    void Specialized();
};

template <typename T>
void X<T, true>::Specialized()
{
    ...
}

template <typename T>
void X<T, false>::Specialized()
{
    ...
}</code>

Alternative Approaches

  • Explicit Specialization: You can explicitly specialize a member function by providing all template arguments.
<code class="cpp">template <>
void X<int, true>::Specialized()
{
    ...
}</code>
  • Overloaded Functions: Introduce overloaded functions that have access to member variables, functions, and objects of the class.
<code class="cpp">template <typename T, bool B>
struct X
{
    template <bool B>
    static void Specialized(int);
};

template <typename T>
inline void X<T, true>::Specialized(int)
{
    ...
}

template <typename T>
inline void X<T, false>::Specialized(int)
{
    ...
}</code>
  • Separate Class Template: Defer to a separate class template to handle specialization.
<code class="cpp">template <typename T, bool B>
struct SpecializedImpl
{
    static void call()
    {
        ...
    }
};

template <typename T, bool B>
struct X
{
    void Specialized()
    {
        SpecializedImpl<T, B>::call();
    }
};</code>

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