Method preVisit

src/simulate/simulate_print.cpp:45–51

            }
        }
        virtual void preVisit ( SimNode * node ) override {
            xcr.push_back(CR);
            CR = false;
            tab ++;
            SimVisitor::preVisit(node);
            ss << "(";
        }
        virtual SimNode * visit ( SimNode * node ) override {
            ss << ")";
            tab --;