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initialization of static variable inside a structure

i have a class in which i have a structure.. how to initialize a static variable "var"

Class A

struct start
static int var;


actually when i am doing like
A::start::var =1;
its giving undefined reference error
Mar 20 '08 #1
1 5278
9,207 Expert Mod 8TB
Static member variables are not part of any one struct variable. All the struct variables will use the same static variable. Therefore, the static variable has to be created outside the struct:
Expand|Select|Wrap|Line Numbers
  1. Class A
  2. {
  4. struct start
  5. {
  6. static int var;
  7. };
  9. };
  11. //in a .cpp ffile
  13. int A::start::var;
Please note that in C++ class and struct are interchangeable. That is, if your members are declared as public/private/protected, there is no difference between a class and a struct. The single difference is when you do not specify public/private/protected, the default access for a class is private whereas the default access for a struct is public. Underneath it all, classes are implemented as structs.
Mar 20 '08 #2

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