Accessing the global variable inside a function when we have a variable of same name

[Dheeraj Joshi]

Hi, I was wondering is there any technique available, so we can access the global variable inside a function if we have a local variable inside the function with the same name as global variable.

Example

#include<something.h>
int countVal = 100;
/*
Some stuff
*/
 
void myFunction()
{
int countVal;
}
 

So here in function myFunction i have a local variable same as global variable.
So inside the function can i still use global variable(countVal). If yes how.?

Regards
Dheeraj Joshi

[Airslash]

nameless namespace.

preceed your global variable with :: when calling it.

so use this code:

#include<something.h>
int countVal = 100;
/*
Some stuff
*/
 
void myFunction()
{
int countVal;
// to use global variable
::countVal
// to use local variable
countVal
}
 

[Banfa]

Note the Scope Resolution Operator :: only exists in C++ so this technique doesn't work in C where you are basically stuffed.

[donbock]

You can be tricky like this:

int countVal = 100; 
static int * const prwGlobalCountVal = &countVal;
static const int * const proGlobalCountVal = &countVal;
...
void myFunction() 
{ 
   int countVal; 
   // for read/write access to global variable 
   ... *prwGlobalCountVal ...
   // for read-only access to global variable 
   ... *proGlobalCountVal ...
   // to use local variable 
   ... countVal ...
}

But this is a good way to outsmart yourself. Much better to change the name of the local variable so there is no collision.

Notice that this trick creates one or two aliases of the global variable. Therefore, you must make a point of not associating the restrict type qualifier with the global variable.

A good lint will warn you if a local name overrides a wider-scope name.

[Dheeraj Joshi]

Ok... Thanks for the reply...

Regards
Dheeraj Joshi