Torque Coding Guidelines: Why "#include"s before "#define"s?

Quote:
o prevent recurring inclusion of header files, all header files have an #ifndef directive immediately following the File Header Comment, and a corresponding #endif directive as the last line of the header file. The following example shows the proper format and nomenclature for a header file called BaseClass.h

#ifndef      _BASECLASS_H_
#define      _BASECLASS_H_
.
// rest of header file for baseclass.h
.
#endif      // _BASECLASS_H_

#pragma once

class classA
{
   classB* mClassB;
};

class classB
{
   classA* mClassA;
};

class classB;   // just tells the compiler that there is some class called classB.

class classA
{
   classB* mClassB;
};

class classA;   // just tells the compiler that there is some class called classA.

class classB
{
   classA* mClassA;
};

//-------------------------------------
// file: myClassA.h
// date: (today)
//-------------------------------------

// Guideline says #include's first
#include "myClassB.h"
#include "console/simbase.h"


//Guideline says #define's second
#ifndef _MYCLASSA_H_
#define _MYCLASSA_H_

//-------------------------------------
//  Begin class: myClassA
//-------------------------------------
class myClassA {
...

...
}  // end class: myclassA

#endif  // end #ifndef _MYCLASSA_H_

// Class header here

#ifndef _MYCLASSA_H_
#define _MYCLASSA_H_

#include "myClassB.h"
#include "otherClass.h"

#define Other_Defines_Go_Here
#define Other_Defines_Go_Here

// Begin Class
class myClassA {
...

...
} // end class

#endif