Author Topic: Sharing variable in different files (Read 3040 times)

iHope · « **on:** February 06, 2012, 04:57:33 pm »

So, I'm really puzzled right now. I would need to get my sf::Shape X to be global, so I could use it in different file. X is in file x.cpp & x.hpp, but I need to get it usable in y.cpp. I heard that global variables could help, but everyone keeps saying they're bad. Help would be really appreciated

Again sorry about my english and asking such a stupid questions :oops:

HKei · « **Reply #1 on:** February 06, 2012, 06:35:03 pm »

Your english isn't really a problem.

Anyways: Have you thought about that maybe you don't actually need a global variable if you just look at the problem from a slightly different view point?

Nexus · « **Reply #2 on:** February 06, 2012, 07:14:14 pm »

Why don't you pass the variable to different files via functions (as parameters) and classes (as members)?

mateandmetal · « **Reply #3 on:** February 06, 2012, 08:07:27 pm »

you could use

extern var_type var_name;

in your y.cpp file (probably not the best solution)

iHope · « **Reply #4 on:** February 06, 2012, 09:13:18 pm »

Okay, thanks for your tips. The main problem is that the "variable" is sf::Shape. I tried to use extern, but it doesn't work(dunno doing something wrong or it just doesn't work).

texus · « **Reply #5 on:** February 06, 2012, 09:35:16 pm »

You shouldn't use it as extern.

Do as Nexus said: pass the variable with the function or put all your variables in a class.
I would do the second thing. Make an instance to the class in your main function and from then you only work with the functions and variables inside that class.

iHope · « **Reply #6 on:** February 07, 2012, 06:47:07 am »

Thank you! I need to check out how to do that, what you explained.