http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56421
--- Comment #5 from Kristian Spangsege <kristian.spangsege at gmail dot com> 2013-02-22 18:04:41 UTC --- (In reply to comment #4) > I think 13.3 [over.match] ¶2 and 13.3.1 [over.match.funcs] ¶7 say the > function > template specialization must be generated before the number of arguments is > checked to see if the candidate function is viable. Not so. Function templates must not be instantiated unless the number of arguments match. [C++11: 13.3/2]: - First, a subset of the candidate functions (those that have the proper number of arguments and meet certain other conditions) is selected to form a set of viable functions (13.3.2). - Then the best viable function is selected based on the implicit conversion sequences (13.3.3.1) needed to match each argument to the corresponding parameter of each viable function. [C++11: 13.3.1/7]: In each case where a candidate is a function template, candidate function template specializations are generated using template argument deduction (14.8.3, 14.8.2). Those candidates are then handled as candidate functions in the usual way.
