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Serge
Guest
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 Posted: Sat Dec 18, 2004 3:01 pm Post subject: unresolved external symbol linker error with a vector which |
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Hi,
I have no problem creating a static member variable with integers, etc but
when I try the same with a vector then I always get linker errors that the
static member variable is unknown (unresolved external symbol)
Below is what an example of the code I use. Can somebody tell me what I am
doing wrong ?
Thanks very much in advance,
Serge
//myclass.h
//header file
#include <vector>
using namespace std;
class myclass
{
public:
static void my_method (int new_value);
private:
static vector<int> m_variable_v; //static member variable
};
//myclass.cpp
//cource code class
#include "myclass.h"
using namespace std;
//define static member variables
vector<int> m_variable_v;
void myclass::my_method(int new_value)
{
m_variable_v.push_back(new_value);
}
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David Harmon
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| Posted: Sat Dec 18, 2004 6:24 pm Post subject: Re: unresolved external symbol linker error with a vector wh |
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On Sat, 18 Dec 2004 16:01:54 +0100 in comp.lang.c++, "Serge"
<serge (AT) NOSPAM (DOT) com> wrote,
| Quote: | //define static member variables
vector<int> m_variable_v;
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Should be:
vector<int> myclass::m_variable_v;
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Serge
Guest
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| Posted: Sat Dec 18, 2004 8:34 pm Post subject: Re: unresolved external symbol linker error with a vector wh |
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Great ! Thanks very much for your quick solution.
Best regards,
Serge
"David Harmon" <source (AT) netcom (DOT) com> wrote
| Quote: | On Sat, 18 Dec 2004 16:01:54 +0100 in comp.lang.c++, "Serge"
[email]serge (AT) NOSPAM (DOT) com[/email]> wrote,
//define static member variables
vector<int> m_variable_v;
Should be:
vector<int> myclass::m_variable_v;
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Mike Wahler
Guest
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| Posted: Sat Dec 18, 2004 10:56 pm Post subject: Re: unresolved external symbol linker error with a vector wh |
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"Serge" <serge (AT) NOSPAM (DOT) com> wrote
| Quote: | Hi,
I have no problem creating a static member variable with integers, etc but
when I try the same with a vector then I always get linker errors that the
static member variable is unknown (unresolved external symbol)
Below is what an example of the code I use. Can somebody tell me what I am
doing wrong ?
Thanks very much in advance,
Serge
//myclass.h
//header file
#include <vector
using namespace std;
class myclass
{
public:
static void my_method (int new_value);
private:
static vector
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This is a declaration, not a definition. No actual object has
been created. And still no vector object will be created
if you create a type 'myclass' object, because 'static' means
that the member is not stored as part of a 'myclass' object,
but separately, only once. I.e. 'm_variable_v's scope is
your class, but it is not actually part of a 'myclass' object.
You need to provide (exactly one)
definition of your static vector.
| Quote: | };
//myclass.cpp
//cource code class
#include "myclass.h"
using namespace std;
//define static member variables
vector<int> m_variable_v;
|
Not quite right. This defines a vector which is *not*
in your class' scope. It has nothing to do with your
class or any objects of that type.
vector<int> myclass::m_variable_v;
| Quote: | void myclass::my_method(int new_value)
|
See how you've qualified 'my_method' as being a member
of 'myclass' here? Same is required for static data members.
| Quote: | {
m_variable_v.push_back(new_value);
}
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-Mike
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Paavo Helde
Guest
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| Posted: Sun Dec 19, 2004 5:39 pm Post subject: Re: unresolved external symbol linker error with a vector wh |
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"Serge" <serge (AT) NOSPAM (DOT) com> wrote in
news:41c44669$0$13470$ba620e4c (AT) news (DOT) skynet.be:
| Quote: | Hi,
I have no problem creating a static member variable with integers, etc
but when I try the same with a vector then I always get linker errors
that the static member variable is unknown (unresolved external
[...]
//define static member variables
vector<int> m_variable_v;
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vector<int> myclass::m_variable_v;
HTH
Paavo
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