使用静态变量时LNK2019错误 [英] LNK2019 error while using static variable

问题描述

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;
}

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?

推荐答案

更改

Change

private:
  Single();

to

to

private:
  Single() {};

这篇关于使用静态变量时LNK2019错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！