Help with using a class in another

[rukkyg]

Here's the errors:

Compiling...
knowledge.cpp
c:\my documents\comp sci ap\ai\vc++\ai\person.h(32) : error C2146: syntax error : missing ';' before identifier 'myKnowledge'
c:\my documents\comp sci ap\ai\vc++\ai\person.h(32) : error C2501: 'Knowledge' : missing storage-class or type specifiers
c:\my documents\comp sci ap\ai\vc++\ai\person.h(32) : error C2501: 'myKnowledge' : missing storage-class or type specifiers
person.cpp
c:\my documents\comp sci ap\ai\vc++\ai\person.h(32) : error C2146: syntax error : missing ';' before identifier 'myKnowledge'
c:\my documents\comp sci ap\ai\vc++\ai\person.h(32) : error C2501: 'Knowledge' : missing storage-class or type specifiers
c:\my documents\comp sci ap\ai\vc++\ai\person.h(32) : error C2501: 'myKnowledge' : missing storage-class or type specifiers

-------------------------------------------------
knowledge.h

#include <fstream.h>
#include &quot;include\apstring.h&quot;
#include &quot;nodetypes.h&quot;
#include &quot;include\apvector.h&quot;

class Knowledge
{
...
};

-------------------------------------------------

person.h


#include &quot;knowledge.h&quot;
#include &quot;include\apstring.h&quot;
#include &quot;utils.h&quot;

#include <fstream.h>

class Person
{
public:
Person();
Person(apstring &);
Person(const apstring & , int);
~Person();

apstring Ask(apstring question);
void Say(const apstring &);
bool isUser();
private:
bool amUser;
void LoadMemory();


const char* file;
apstring myName;

Knowledge myKnowledge; //line 32
};

 

[Nosferatu]

My wild guess is that you have some circular header inclusions there. Does the &quot;person.h&quot; gets included from other header files specified in Knowledge.h?

If so, just mention the Knowledge class name before defining Person; this is called a class declaration (or empty type specification) and it is a helper for the compiler when such situations are present:

#include &quot;knowledge.h&quot;
#include &quot;include\apstring.h&quot;
#include &quot;utils.h&quot;

#include <fstream.h>

class Knowledge;

class Person
{
public:
Person();
Person(apstring &);
Person(const apstring & , int);
~Person();
...

I guess this should work. [red]Nosferatu[/red]
We are what we eat...
There's no such thing as free meal...
once stated: methane@personal.ro

 

[chipperMDW]

The class declaration only works when you just need a pointer or reference to an object of that class, and you don't invoke any functions through it. In the case of Person, there is an actual Knowledge object, not just a pointer thereto, so a class declaration wouldn't be sufficient there.

 

[rukkyg]

I was including person.h in the nodetypes. I took that away and then saw that I had apparantly not included person.h in to person.cpp. I probably took it out when i was changing all the files trying to get it work. It Compiles now. Now to get it working. Thanks for help.