Mario: prepartations for multiple moving objects

mario/visitors/bounce_visitor.hpp

@@ -0,0 +1,34 @@
+#ifndef BOUNCE_VISITOR_HPP
+#define BOUNCE_VISITOR_HPP
+
+#include "../../sdlpp/sdlpp_visitor.hpp"
+#include "../../sdlpp/sdlpp_geometry.hpp"
+
+class BounceVisitor : public SDLPP::Visitor {
+public:
+    BounceVisitor() {}
+    virtual void visit( const SDLPP::RenderObject &obj ) override;
+    virtual void setFromId( uint64_t id ) override {
+        from = id;
+    }
+    virtual uint64_t getFromId() override {
+        return from;
+    }
+    virtual void setVisitorType( uint64_t type ) override {
+        _type = type;
+    }
+    virtual uint64_t getVisitorType() override {
+        return _type;
+    }
+
+    bool canBounce() {
+        return hits < 2;
+    }
+
+private:
+    int hits = 0;
+    uint64_t from;
+    uint64_t _type;
+};
+
+#endif