Small performance issue when getting triangles

[icedevelopment]

Is it possible to change the return value of std::vectorp2t::Triangle* CDT::GetTriangles() ?

It receive a reference from sweep_context_->GetTriangles(); but it is converted into a copy of the vector that takes more time than if the vector returned by const reference.

Same for std::listp2t::Triangle* CDT::GetMap()