static member variable

[Ekim]

given the following code:

myclass.h:
-------------------------------

class CMyClass
{
public:
CMyClass();
private:
static int test;
}
--------------------------------


myclass.cpp:
-------------------------------

#include "myclass.h"

CMyClass::CMyCl ass
{
CMyClass::test = 5; // error: unresolved external symbol
}
--------------------------------


I want to make a private member variable of static kind. What did I make
wrong? I always get the error message "unresolved external symbol".
I've already tried to access it via "this->test" but this doesn't work
either. Is it not allowed to access the static variable outside the same
file? What do I have to do in order to be able to access it from within my
member-functions?

any help is appreciated,
ekim

[Iakov Nakhimovski]

Re: static member variable

myclass.cpp should contain a line:

int CMyClass::test = 5; // initial value for the static variable must be set
separately

It's ok to use the variable in the constructor (or any method) if you need
this.

Make sure you understand the difference between link & compile time errors
for the future.

HTH, Iakov

"Ekim" <the.newsletter @gmx.net> wrote in message
news:2p0c06Ffgf 5qU1@uni-berlin.de...[color=blue]
> given the following code:
>
> myclass.h:
> -------------------------------
>
> class CMyClass
> {
> public:
> CMyClass();
> private:
> static int test;
> }
> --------------------------------
>
>
> myclass.cpp:
> -------------------------------
>
> #include "myclass.h"
>
> CMyClass::CMyCl ass
> {
> CMyClass::test = 5; // error: unresolved external[/color]
symbol[color=blue]
> }
> --------------------------------
>
>
> I want to make a private member variable of static kind. What did I make
> wrong? I always get the error message "unresolved external symbol".
> I've already tried to access it via "this->test" but this doesn't work
> either. Is it not allowed to access the static variable outside the same
> file? What do I have to do in order to be able to access it from within my
> member-functions?
>
> any help is appreciated,
> ekim
>
>[/color]

[Carlos Martinez Garcia]

Re: static member variable

Hi Ekim:

You have declare a static member variable and use it,
but you haven't defined it.

In your source put the definition after #include "myclass.h"
int CMyClass::test= 0; //for example

Ekim escribió:[color=blue]
> given the following code:
>
> myclass.h:
> -------------------------------
>
> class CMyClass
> {
> public:
> CMyClass();
> private:
> static int test;
> }
> --------------------------------
>
>
> myclass.cpp:
> -------------------------------
>
> #include "myclass.h"
>
> CMyClass::CMyCl ass
> {
> CMyClass::test = 5; // error: unresolved external symbol
> }
> --------------------------------
>
>
> I want to make a private member variable of static kind. What did I make
> wrong? I always get the error message "unresolved external symbol".
> I've already tried to access it via "this->test" but this doesn't work
> either. Is it not allowed to access the static variable outside the same
> file? What do I have to do in order to be able to access it from within my
> member-functions?
>
> any help is appreciated,
> ekim
>
>[/color]

[Ekim]

Re: static member variable

problem solved - thx a lot to both of you!

by ekim

"Iakov Nakhimovski" <iakov.fake.add ress@hotmail.co m> wrote in message
news:cgeu88$2j6 $1@news.island. liu.se...[color=blue]
> myclass.cpp should contain a line:
>
> int CMyClass::test = 5; // initial value for the static variable must be[/color]
set[color=blue]
> separately
>
> It's ok to use the variable in the constructor (or any method) if you need
> this.
>
> Make sure you understand the difference between link & compile time errors
> for the future.
>
> HTH, Iakov
>
> "Ekim" <the.newsletter @gmx.net> wrote in message
> news:2p0c06Ffgf 5qU1@uni-berlin.de...[color=green]
> > given the following code:
> >
> > myclass.h:
> > -------------------------------
> >
> > class CMyClass
> > {
> > public:
> > CMyClass();
> > private:
> > static int test;
> > }
> > --------------------------------
> >
> >
> > myclass.cpp:
> > -------------------------------
> >
> > #include "myclass.h"
> >
> > CMyClass::CMyCl ass
> > {
> > CMyClass::test = 5; // error: unresolved external[/color]
> symbol[color=green]
> > }
> > --------------------------------
> >
> >
> > I want to make a private member variable of static kind. What did I make
> > wrong? I always get the error message "unresolved external symbol".
> > I've already tried to access it via "this->test" but this doesn't work
> > either. Is it not allowed to access the static variable outside the same
> > file? What do I have to do in order to be able to access it from within[/color][/color]
my[color=blue][color=green]
> > member-functions?
> >
> > any help is appreciated,
> > ekim
> >
> >[/color]
>
>[/color]