StackOverflow2013

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18361773
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2013-08-21T15:36:29.953
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2013-08-21T15:36:29.953
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2017-05-23T10:32:15.027
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420683
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18355814
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2
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1
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text
Body
(Repeating from my comments to the OP.) The actual problem in the line <code>instate force = &Self::memberMethod<ArgTypes...>;</code> is a missing <code>template</code> keyword: <pre><code>instate force = &Self::template memberMethod<ArgTypes...>; </code></pre> See, e.g. <a href="https://stackoverflow.com/q/610245/420683">Where and why do I have to put the “template” and “typename” keywords?</a> Actually, the explicit template arguments are not necessary here [over.over]/1: <blockquote> A use of an overloaded function name without arguments is resolved in certain contexts to [...] a pointer to member function for a specific function from the overload set. A function template name is considered to name a set of overloaded functions in such contexts. The function selected is the one whose type is identical to the function type of the target type required in the context. </blockquote> i.e., because <code>instate</code> defines the function type, the compiler is able to determine which overload (here: template specialization) to choose for the name <code>Self::memberMethod</code>. <hr> There might be easier solutions to force instantiation of a function template, even inside the class definition. One that comes to my mind is to use a private <code>typedef</code> like <code>using dummy = integral_constant<instate, &Self::memberMethod>;</code> (or a <code>static constexpr instate dummy = &Self::memberMethod;</code>). I'm quite, but not 100 % sure the <code>typedef</code> forces the instantiation of the member function template. The function template is instantiated when a definition of that function is required, and the ODR suggests this is the case here: "A function whose name appears as a potentially-evaluated expression is odr-used if it is the unique lookup result or the selected member of a set of overloaded functions" and "Every program shall contain exactly one definition of every non-inline function or variable that is odr-used in that program"
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