Help with static class members
Author
I''m trying to make a simple class that contains a static int that counts the instances of the class.
When I add a line to my class constructor that increments the count I get linker errors.
What''s wrong?
Author
Oh, here''s the error:
error LNK2001: unresolved external symbol "public: static int Object::Count" (?Count@Object@@2HA)
error LNK2001: unresolved external symbol "public: static int Object::Count" (?Count@Object@@2HA)
No idea what''s wrong, try posting some code.
Sand Hawk
----------------
(Inspired by Pouya)
Sand Hawk
----------------
(Inspired by Pouya)
You need to define the variable somewhere, ie:
// header fileclass something{ static int count;} // implementation fileint something::count = 0;
I had that same problem. You must give your static variable a value in a cpp file if you want to use it:
In the .h file
class Test
{
public:
Test();
~Test();
static int var;
};
Then in the .cpp file
int Test::var=0;
Test::TesT()
{
var++;
}
This will work.
Good Luck!
www.nzcal.com/hp/realmgames
In the .h file
class Test
{
public:
Test();
~Test();
static int var;
};
Then in the .cpp file
int Test::var=0;
Test::TesT()
{
var++;
}
This will work.
Good Luck!
www.nzcal.com/hp/realmgames
Author
Sorry I didn''t post my code...I wasn''t thinking.
Greatone, that was the problem. I had declared the variable in the class header, but hadn''t initialized it. To my credit I did try once, but I had left the type (int) off of the initialization and it failed to compile as well. When it failed, I removed the line and looked elsewhere for the problem, not realizing how close I was to fixing it.
Thanks.
Greatone, that was the problem. I had declared the variable in the class header, but hadn''t initialized it. To my credit I did try once, but I had left the type (int) off of the initialization and it failed to compile as well. When it failed, I removed the line and looked elsewhere for the problem, not realizing how close I was to fixing it.
Thanks.
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