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    <p>As part of resolving <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1399" rel="nofollow">http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1399</a>, it was decided that a parameter pack that is non-deducible will not participate in deduction, hence keeping the explicitly specified arguments within the parameter list, but not disturbing the matching of subsequent arguments to subsequent function parameters. However those added rules do not necessarily apply for deduction when comparing types (which is a sub-algorithm of the deduction of the set of parameters against the arguments for a function call).</p> <p>I would argue that the resolution should apply to your situation aswell and regard it as simply an area where the specification is not entirely clear. You may want to send a bug report to the respective compilers and they may want to send an issue report to WG21 for asking to clarify this (although I am not sure I would go as far as saying that this is a normative spec issue - the Standard says elsewhere that non-deducible contexts do not participate in deductions). </p> <p>Note as <code>A1</code> is a parameter of the enclosing class template (and hence become normal parameters when the class is instantiated), you can omit them and keep the same meaning as far as template argment deduction is concerned</p> <pre><code>class Test { public: template &lt;class... A2&gt; void print (A2..., float, double) { } }; int main () { Test test; test.print&lt;int&gt; (1, 1.0f, 1.0); // works } </code></pre>
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    1. POVariadic template code compiles on GCC 4.6 but not on clang or GCC 4.7
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    1. POVariadic template code compiles on GCC 4.6 but not on clang or GCC 4.7
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    1. COYou removed the function pointer in your example. It still fails if I don't remove it: http://ideone.com/I3KY8d
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    2. CO@eyelash that is what i say in my answer.
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    3. CO@JohannesSchaub-litb Does the 'non-deducibility' stems from the fact that there are two parameter packs (pp) near each other, a pp is not the last parameter of the function, or any other general set of rules?
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