SampleClass Test1;
SampleClass Test2;
void SampleClass::SampleClass()
{
static int test;
printf("Static addressed @ %p\n",&test);
}
When using the piece of code above I recieve the output of:
Static addressed @ 0045B8CC
Static addressed @ 0045B8CC
So my problem is how do I get around this? Or is this a bug in C++ (im using the MSVC6 compiler)?
Thanks
Extracting Patch....
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Core Dumped, Now Installing Linux.....
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Mike
Team AI: Http://members.iinet.net.au/~slyons/teamai
Static variables in classes
Author
I have noticed that in C++ when using a class if you use a static variable (encapsulated inside the class), that the same static variable will be shared across all instances of this class.
eg.
You can declare a static variable in a constructor, but in the class definition.
------------------------
- Seby -
www.dfhi-bomber.fr.st
[edited by - theSeby on August 8, 2003 3:23:44 AM]
class MyClass{public : static int test; ...};...MyClass::MyClass(...){ test=5; ...} ------------------------
- Seby -
www.dfhi-bomber.fr.st
[edited by - theSeby on August 8, 2003 3:23:44 AM]
Author
Is there any other possible ways?
I hate doing things such as that because it doesn''t really conform to OO Design. But then again C++ isnt really a full implemented OO language.
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Mike
Team AI: Http://members.iinet.net.au/~slyons/teamai
I hate doing things such as that because it doesn''t really conform to OO Design. But then again C++ isnt really a full implemented OO language.
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Initializing Windows XP Update Path 2543663B....
Core Dumped, Now Installing Linux.....
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Mike
Team AI: Http://members.iinet.net.au/~slyons/teamai
quote:Original post by Mike737
I have noticed that in C++ when using a class if you use a static variable (encapsulated inside the class), that the same static variable will be shared across all instances of this class.
Er... this is exactly what static inside a class is supposed to do.
How exactly do you want to get around this? You use a static variable for the exact reason you mentioned, to share an a variable across all instances of a class. Are you actually looking for a solution whereby each instance of a class is aware of the other one in someway?
Author
quote:Original post by BitMaster
Er... this is exactly what static inside a class is supposed to do.
Oh?! When using VB static variables are actually not shared... they are relative to that particular instance of that class so SampleClass1 = 1 while SampleClass2 = 2.
I''m using static variables for a number of functions, but the main concerning one is that I have several functions inside my class which keep the last time that that particular function was called. Then I check whether enough time has elapsed for me to do an update on that function. There are about 100 instances of the 1 particular class running as it is my bot class.
So I guessing that I''m gonna have to bite the bullet and put them in the class declaration?
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Initializing Windows XP Update Path 2543663B....
Core Dumped, Now Installing Linux.....
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Mike
Team AI: Http://members.iinet.net.au/~slyons/teamai
I think you are looking for something like this:
#include <iostream>class foo { public: foo(): my_id(++count) { std::cout << "I am instance " << my_id << "." << std::endl; } int my_id; static int count; }foo::count = 0;foo foo1, foo2, foo3;
it''s not a bug, a static variable sticks with what it is supposed to. if you want a specific variable for a class what''s wrong with members? 
// MyClass.h File:class MyClass{ static long test;};// MyClass.cpp File:long MyClass::test =0;Maybe you mean this:
class MyClass{ void function (void);}void MyClass:function(void){ static access=0; std::cout << "I have been accessed " << ++access << " times";}Now the static is not shared between the instances. Access will be set to 0 when function is called for the first time, after that this line is ignored (This is only valid for variable=0 I think).
You don''t need to use static for that in any case though, that''s the nice thing about a class.
class MyClass{ long functionCounter; void function (void);}void MyClass::function(void){ ++functionCounter;}This topic is closed to new replies.
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