CODEWITHSUNDEEP
c++classscope
Abhishek
Abhishek

Reputation: 149

How can I declare a variable so that it will hold its value and can be accessible from any class in C++?

My Projects contains multiple classes each has its own separate .h and .cpp file .
I want to declare a variable use so that I can access/modify its value from any of the classes .

Upvotes: 0

Views: 93

Answers (2)

nicomp
nicomp

Reputation: 4647

You can use a public static variable in one of your classes or you can be naughty and declare a global variable outside of all your classes in one module and then use the extern keyword to reference it in other modules.

C++ is a hybrid OOP language: you don't have to use classes all the time. If you do that, be ready to get flamed by self-righteous programmers and StackOverflow lurkers.

Upvotes: 0

Kerrek SB
Kerrek SB

Reputation: 477010

You can add another translation unit to define a variable at namespace scope and make it accessible by providing a declaration:

var.h:

extern int a;

var.cpp:

#include "var.h"

int a = 15;

Now every translation unit in your program can #include "var.h" and use a.

It may be sensible to a) give the variable a meaningful, unambiguous name, and b) place it in a named namespace.

Upvotes: 3

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