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Answer 1

+3 A:

It's likely that you have more than one graph.h file in the filesystem and the wrong one is included. If it's because of accidential copying remove the unneeded copies, if it's because of collision with C++ standart library or other libraries headers you should rename you header files to prevent such collisions in future.

sharptooth 2009-05-15 06:39:00

Answer 2

A:

Maybe the name Graph is in a namespace? What does that graph.h file say -- is Graph at top-level, or inside a namespace statement?

Alex Martelli 2009-05-15 06:39:16

my graph.h starts like this //#include "main.h"#include <stdio.h>#include <iostream>using namespace std;class Graph{private: int maxVal; Vlist vertList; Elist edgeList; public:Is that what you meant by being in namespace? Should I avoid using namespace like that? Does not using it mean that I have to use std:: before each standard function?Anyway, as I was copying the text to put here I noticed the problem was that I was including main.h in my graph.h file. Problem solved.Thanks!

Dave 2009-05-15 06:51:59

Nope, here you make all the contents of the std:: visible without using the std:: prefix. Alex meant you could have smth like this: namespace MyNamespace { class Graph {}; };

sharptooth 2009-05-15 06:56:52

I normally avoid "using namespace foo;" because it can get confusing for the reader or maintainer of the code, but, of all namespaces, std is the one that it can make sense to use this way.

Alex Martelli 2009-05-15 13:31:25

Answer 3

+1 A:

A common possibility for this is an incorrect include guard in Graph.h, possibly a left-over from another header file you are using.

That is, make sure the "#ifndef GRAPH_H"-like line you are supposed to have in Graph.h is really what it is supposed to be...

(but really, without more information answering this question is... hard).

Hexagon 2009-05-15 06:48:26

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Passing a **Class as an argument

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