pretty printing -- copmlete for xo::ast::GeneralizedExpression

xo-simulator/include/xo/simulator/Simulator.hpp

@@ -218,6 +218,8 @@ namespace xo {
             /* synonym for .advance_one_event() */
             virtual std::uint64_t run_one() override;
 
+            virtual void display(std::ostream & os) const override;
+
         private:
             explicit Simulator(utc_nanos t0);
 

xo-simulator/src/simulator/Simulator.cpp

@@ -543,6 +543,16 @@ namespace xo {
             return n;
         } /*run_throttled_until*/
 
+        void
+        Simulator::display(std::ostream & os) const
+        {
+            os << "<Simulator"
+               << xtag("sim_heap.size", sim_heap_.size())
+               << xtag("n_event", n_event_)
+               << xtag("src_v.size", src_v_.size())
+               << ">";
+        } /*display*/
+
     } /*namespace sim*/
 } /*namespace xo*/