Xcode C++ "Use of undeclared identifier" error with another class -


i've done reading on site here undeclared identifier errors in xcode , c++. seems comes small typo somewhere in code, can't figure out life of me why i'm getting error (also please note beginner in c++, may making dumb mistake).

i'm writing own library artificial neural nets, , when try compile 'connection' class bunch of "use of undeclared identifier 'node'" error on every line in connection.h file has node class somewhere in it. classes node , connection in same namespace, , both cpp files implemented functions declared in header files. here header files both classes:

connection.h (where i'm having problems):

#include <iostream> #include <tuple> #include <boost/shared_ptr.hpp> #include "node.h"   namespace ann{     class connection{        public:          connection();         connection(boost::shared_ptr<node> innode, boost::shared_ptr<node> outnode, float weight, int connid);         ~connection();          virtual boost::shared_ptr<node> getinputnode();         virtual boost::shared_ptr<node> getoutputnode();         virtual void setinputnode(boost::shared_ptr<node> innode);         virtual void setoutputnode(boost::shared_ptr<node> outnode);         virtual float getconnectionweight();         virtual void setconnectionweight(float weight);          virtual int getconnectionid();         virtual void setconnectionid(int id);      protected:          std::tuple<boost::shared_ptr<node> , boost::shared_ptr<node> , float> connection;         int connectionid;      private:       }; }

in addition, i'm getting other errors in line have protected connection variable declared. i'm getting "parse issue : expected type" , "parse issue : expected member name or ';' after declaration specifiers".

here node.h:

#include <iostream> #include <vector> #include <boost/shared_ptr.hpp> #include "activationfunction.h" #include "connection.h"    namespace ann{      class node{        public:          enum{             input = 0,             hidden = 1,             output = 2         }kannnodetypes;          node(int num, int nodetype);         ~node();          virtual void addoutputconnection(boost::shared_ptr<connection> outputconnection);          virtual void activatenode(activationfunction* activationobject);         virtual void addinputsignalfromincomingnode(float inputsignal, float connectionweight);         virtual int getnodetype();         virtual int getnodenum();         virtual void loadinputassensorinput(float input);         virtual bool isactivated();         virtual bool isallinputsreceived();         virtual float getlatestoutput();         virtual void resetnode();         virtual void sendoutputtooutputnodes();         virtual void setnumberofinputconnections(int nc);         virtual int getnumberofinputconnections();      protected:            int nodenum;         int nodetype;         int ninputconnections;         int inputconnectioncount;         float latestoutput;         bool activated;         float inputsignal;         bool allinputsreceived;         std::vector<float> outputweights;         std::vector<boost::shared_ptr<node>> outputconnections;           private:       }; }


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