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C++ global class, unresolved external symbol

Posted on 2013-11-18
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Last Modified: 2013-11-18
When I compile the following it give me a link error:
Error      1      error LNK2001: unresolved external symbol "private: static enum Language i18n::currentLanguage" (?currentLanguage@i18n@@0W4Language@@A)      C:\Users\Public\0SBCS\VS\test\i18ntest\i18ntest\MenuItemONE.obj      i18ntest
My idea is to:
  + enumerate the languages
  + store the current language setting in a static class
  + later return a string based on the current language setting

C++ doesn't have static classes, so I'm using a class with static members and static fields. (Any suggested improvements?)
Language.h
#pragma once

  enum Language
  {
    ENGLISH,
    SPANISH,
    FRENCH
  };

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i18n.h
#pragma once
#include "language.h"

class i18n
{
private:
  static Language currentLanguage;
public:
  static Language GetCurrentLanguage()
  {
      return currentLanguage;
  }
  static void SetCurrentLanguage(Language lang)
  {
      currentLanguage = lang;
  }
};

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i18n.cpp
#include "StdAfx.h"
#include "i18n.h"

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MenuItemONE.h
#pragma once
#include <string>
#include <iostream>
#include "Language.h"

class MenuItemONE
{
public:
    std::string GetText();
    Language GetCurrentLanguage();
};

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MenuitemONE.cpp
#include "StdAfx.h"
#include "MenuItemONE.h"
#include "Language.h"
#include "i18n.h"


Language MenuItemONE::GetCurrentLanguage()
{
    return i18n::GetCurrentLanguage();
}


std::string MenuItemONE::GetText()
{
    Language cl = GetCurrentLanguage();
    switch(cl)
    {
        case ENGLISH:
        default:
            return "English ONE menu text";
            break;
        case SPANISH:
            return "Spanish ONE menu text";
            break;
        case FRENCH:
            return "French ONE menu text";
            break;
    }  
}

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0
Comment
Question by:deleyd
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3 Comments
 
LVL 32

Accepted Solution

by:
phoffric earned 250 total points
ID: 39657340
You need to define your static class member currentLanguage declaration in your .cpp file:

Language i18n::currentLanguage = ENGLISH;
0
 
LVL 34

Assisted Solution

by:sarabande
sarabande earned 250 total points
ID: 39657363
to add to before comment:

the statement phoffric posted should added to the i18n.cpp file and you should assign a default language.

#include "StdAfx.h"
#include "i18n.h" 

Language i18n::currentLanguage = English; 

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i would omit including stdafx.h in that file and use the option 'do no use precompiled header' for that file in the c++ - precompiled header settings (both release and debug configuration).

note, static member functions can be defined in the h file directly. static member variables however need an instantiation in one (and only one) cpp file. it cannot be instantiated in the h file cause this could be included by multiple cpp files.

Sara
0
 
LVL 34

Expert Comment

by:sarabande
ID: 39657368
Language i18n::currentLanguage = ENGLISH;

i should make a refresh more often :-)

Sara
0

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