Function wrap_create_instance

include/cripts/Epilogue.hpp:203–210

// instance data.
template <typename T>
auto
wrap_create_instance(T *context, bool execute, CaseTag<1>) -> decltype(_do_create_instance(context), bool())
{
  if (execute) {
    _do_create_instance(context);
  }
  return true;
}

template <typename T>
auto