Question

Possible Duplicate:
Avoiding Circular Dependencies of header files

Task.h:

#ifndef Tasks_h
#define Tasks_h

#include "Executors.h"

class Task
{
    Executor *current_executor;
};

#endif Tasks_h

Executor.h:

#ifndef Executors_h
#define Executors_h

#include "Tasks.h"

class Executor
{
    Task *current_task;
};

#endif Executors_h

main.cpp:

#include <conio.h>
#include <stdio.h>
#include "Tasks.h"
#include "Executors.h"

int main()
{
    Executor ex;

    return 0;
}

Compilation errors:

Error   1   error C2146: syntax error : missing ';' before identifier 'current_task'    c:\users\rain\documents\visual studio 2010\projects\text\text\executors.h   8
Error   2   error C4430: missing type specifier - int assumed. Note: C++ does not support default-int   c:\users\rain\documents\visual studio 2010\projects\text\text\executors.h   8
Error   3   error C4430: missing type specifier - int assumed. Note: C++ does not support default-int   c:\users\rain\documents\visual studio 2010\projects\text\text\executors.h   8

Again… in C# i never can meet such problems, but i do my best to support C++ and use it.
Don’t want to code all classes in one header file

Answer 1

this is just an example. there maybe be pointers instead

If you can switch to using pointers, you could replace header inclusions with forward declarations:

#ifndef Executors_h
#define Executors_h

class Task;

class Executor
{
    Task *current_task_ptr;
};

#endif Executors_h