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POForcing variadic template member function instantiation in class
 

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  1. POForcing variadic template member function instantiation in class
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    <p>I have a class which has a variadic member function:</p> <pre><code>class class_name { template&lt;ArgTypes.. args&gt; some_return_type memberMethod(ArgTypes... args) { //stuff... } } </code></pre> <p>I need to force instantiation of this method <strong>inside the class definition block</strong>. I loose the method name outside of the class definition block because the class is generated by a bunch of macros.</p> <p>I try to force the instantiation by copying a pointer to a specialised member function (pseudo code):</p> <pre><code>template&lt;typename Self, typename RetType, typename... ArgTypes&gt; struct force_instantation_imlp&lt;Self, RetType, type_placeholder, type_placeholder&lt;ArgTypes...&gt;&gt; { force_instantation_imlp() { using instate = RetType (Self::*)(ArgTypes...); instate force = &amp;Self::memberMethod&lt;ArgTypes...&gt;; } }; class class_name { template&lt;ArgTypes.. args&gt; some_return_type memberMethod(ArgTypes... args) { //stuff... } force_instantation_imlp&lt;class_name, some_return_type, rest_of_types_deduced_from_context&gt; force_virtual_instantation; } </code></pre> <p><code>type_placeholder</code> is just a helper template to "freeze" parameter pack.</p> <p>This unfortunately gives me a compile error </p> <pre><code>error: expected primary-expression before ‘...’ token instate force = &amp;Self::memberMethod&lt;ArgTypes...&gt;; </code></pre> <p>I guess that this error results from teh fact that the member function is a variadic template.</p> <p>Is there any way to force variadic template member function instantiation inside the class definition block?</p>
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    1. USMarcin
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    1. COYou could just use `auto` instead of `instate` : `auto force = &Self::memberMethod<ArgTypes...>;`. That saves you from writing the `using` to define a type.
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    2. COHave you tried leaving out the explicit template arguments in `instate force = &Self::memberMethod<ArgTypes...>;`?
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    3. CO@Nawaz good point. I still didn't develop c++11 habits. Still the issue remains open.
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