message: Mute warning 4661 of visual
diff: #pragma warning( disable : 4250 ) // warning about diamond inheritance
  #pragma warning( disable : 4251 ) // dll interface warnings
  #pragma warning( disable : 4275 ) // let's pray we have no issues
  +#pragma warning( disable : 4661 ) // template alias before implementation
  #endif
  #define ringmesh_disable_copy( Class ) \
  