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bluwind

Header file placement.

4 posts in this topic

Language is C++.

Ok, so their is no such thing as a stupid question..

I know the Name says it all with "Header File", but does it matter where I include the header file - I am using header files to contain my different classes, E.G  Players.h, MapBuilder.h, GameLogic.h.

You can pretty much guess what each header contains. Now because the Players.H file uses Global variables from my main .cpp I have #include the header file after the variables have been initialized. Will this cause me problems later down the line and if it will can someone point me in the direction of a better solution?.

 

 

Cheers Rob

 

 

~~~~~~Please remember I am posting in the beginner forum for a reason - so please don't flame~~~~~~

Edited by bluwind
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1. Dont use globals if you can use non-globals

 

2. If you do, put the globals in a header file that the player includes and initialize them in some cpp file (not exactly sure how to do this, googling will tell you. Or you can pack them in a struct or class and pass one to player if it makes sense)

So youd declare the globals in a .h, and define them in a .cpp (so you have 2 .cpp, one is main and other is globals? or you can define them in main too possibly)

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thanks for the great comments guys. I'm going to spend a little time tonight going through information regarding putting globals in header files.

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The basic idea for all header files is that they don't make things: they only describe things that are made elsewhere. Like Eight mentioned, learning the difference between declaration (there's something) and definition (and this is what it is) is the key to understanding this.

 

For instance:

/*FUNCTIONS*/
int myFunc(int foo, char* bar); //declaration

int myFunc(int foo, char* bar) { //definition
  return bar[foo];
}

/*CLASSES*/
class Thingy { //declaration
public:
  Thingy();
private:
  int number;
};

//definition
Thingy::Thingy() {
 number = 4;
}

/*GLOBALS*/
extern int myGlobalVar; //declaration (extern here means 'defined elsewhere')

int myGlobalVar = 5; //definition (assigning a value here is optional)

/*NAMESPACE MEMBERS*/
namespace ThePlace { //declaration (same as in the global space)
  extern int itsReallyJustAGlobal;
  int aFunction();
}

int ThePlace::itsReallyJustAGlobal; //definition

int ThePlace::aFunction() { //definition
  return 3;
}

Declarations go in header files. Definitions go in code files. The reason is that declarations are information for the linker, which connects the parts of your program together. Definitions are information for the compiler, which actually makes the parts. Declaration allows you to tell all of the parts of your program that something exists, but you only have to define the part once.

Edited by Khatharr
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