LNK2019 error while using static variable

Question

2.00/5 (1 vote)

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C#

class Single
{
private:
   Single();

public:
   static Single& Single::Instance()
   {
      static Single the_instance;
      return the_instance;
   }
};
int main()
{
    cout <<  "Hello World!" << endl;

    Single& instance1 = Single::Instance();
    Single& instance2 = Single::Instance();

    return 0;
}

VB

main.obj : error LNK2019: unresolved external symbol "private: __cdecl Single::Single(void)" (??0Single@@AEAA@XZ) referenced in function "public: static class Single & __cdecl Single::Instance(void)" (?Instance@Single@@SAAEAV1@XZ)
debug\sampleSingletontled.exe : fatal error LNK1120: 1 unresolved externals

What am I doing wrong?

Posted 2-Dec-14 1:12am

Member 11279587

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Kornfeld Eliyahu Peter · Accepted Answer · 2014-12-02T01:24:00

Solution 1

Change

C++

private:
  Single();

to

C++

private:
  Single() {};

Posted 2-Dec-14 1:24am

Kornfeld Eliyahu Peter

Comments

Member 11279587 2-Dec-14 7:46am

Thanks!!