Implement IOFormat wrappers

See merge request oss/rotgen!34

src/map_model.cpp

@@ -265,6 +265,11 @@
     return os << m.storage_->data;
   }
 
+  ROTGEN_EXPORT std::ostream& operator<<(std::ostream& os,format<CLASSNAME> const& m)
+  {
+    return os << m.matrix_.storage_->data.format(m.format_.storage()->instance);
+  }
+
   ROTGEN_EXPORT bool operator==(CLASSNAME const& lhs, CLASSNAME const& rhs)
   {
     return lhs.storage_->data == rhs.storage_->data;