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POMember function type for template specialization
 

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  1. POMember function type for template specialization
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    <p>I am studying the uses of function types in template specialization and I am wondering if there such a thing as a member function type (not talking about member function pointers).</p> <p>The case that led me to this question is better explained by an exemple...</p> <pre><code>template&lt; typename FunctionType &gt; struct Function; // Undefined // Specialize for functions with 0 parameter... template&lt; typename ReturnType &gt; struct Function&lt; ReturnType() &gt; // Notice the unusual syntax here... { // Function pointer that fits the signature of the template... ReturnType (*m_pointerToFunction)(); }; // Specialize for functions with 1 parameter... template&lt; typename ReturnType, typename ParameterType &gt; struct Function&lt; ReturnType(ParameterType) &gt; { ReturnType (*m_pointerToFunction)(ParameterType); }; // ... etc up to a certain number of parameter. // To use this template: void SomeFunctionTakingNoParameter() { } Function&lt; void() &gt; test; test.m_pointerToFunction = SomeFunctionTakingNoParameter; </code></pre> <p>Now what I would like to do is create specialization for member functions. The first thing I tried is:</p> <pre><code>template&lt; typename ReturnType, typename ObjectType, typename ParameterType &gt; class Function&lt; ObjectType, ReturnType(ParameterType) &gt; { ReturnType (ObjectType::*m_memberFunctionPointer)(ParameterType); }; </code></pre> <p>and I use it like this:</p> <pre><code>struct Object { void DoSomething() { } }; Function&lt; Object, void() &gt; function; function.m_memberFunctionPointer = &amp;Object::DoSomething; </code></pre> <p>I have to supply 2 arguments to the template (the object type and the signature). I would like to see if there is a way to do it all in one parameter.</p> <p>The next bit does not compile but I wonder if there is something similar in the language?</p> <pre><code>template&lt; typename ObjectType, typename ReturnType &gt; struct Function&lt; ObjectType::ReturnType() &gt; { ReturnType (ObjectType::*m_memberFunctionPointer)(); }; Function&lt; Object::void() &gt; function; function.m_memberFunctionPointer = &amp;Object::DoSomething; </code></pre>
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