[Bug c++/62255] Introducing an unrelated template parameter causes compilation to fail

[conradsand.arma at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62255

--- Comment #2 from Conrad <conradsand.arma at gmail dot com> ---
When the irrelevant template parameter is used (arma_template_test.ii), g++
thinks that "value" in the following code can't be determined at compile time:

template<typename T>
struct is_Col_fixed_only
  {
  typedef char yes[1];
  typedef char no[2];

  template<typename X> static yes& check(typename X::Col_fixed_type*);
  template<typename>   static no&  check(...);

  static const bool value = ( sizeof(check<T>(0)) == sizeof(yes) );
  };