A question about global variables

[Tony Johansson]

Hello experts!

Is it any difference if I instansiate object testobj of class Test as
alternative (1) or (2).
In this case I think it's the same thing. I'm I right.

(1)Test testobj
(2) static Test testobj
main()
{}

Many thanks!
//Tony

 

[Jason]

Hello experts!

Is it any difference if I instansiate object testobj of class Test as

alternative (1) or (2).
In this case I think it's the same thing. I'm I right.

(1)Test testobj
(2) static Test testobj
main()
{}

Many thanks!
//Tony

Yes, and no.

Static global variables have what is called file-level scope. Within
this c++ file you can use either method interchangeably. However, if
you are linking this file with another file, then the statically
declared variable will not be available (without using extern) in that
file.

-Jason

 

[Jason]

Static global variables have what is called file-level scope. Within

this c++ file you can use either method interchangeably. However, if
you are linking this file with another file, then the statically
declared variable will not be available (without using extern) in that
file.

My bad. Using extern makes no difference in this context. A static
global variable is usable from that file, and that file only. I'm
surprised no one jumped on this yet! ;P

-Jason