C++ pass argument to singleton

class Questionnary
{
  std::string _str;

  static Questionnary& getInstanceImpl(std::string* const s = nullptr)
  {
    static Questionnary instance{ s };
    return instance;
  }

  Questionnary(std::string* const s)
    : _str{ s ? move(*s) : std::string{} } // employ move ctor
  {
    if (nullptr == s)
      throw std::runtime_error{ "Questionnary not initialized" };
  }

public:
  static Questionnary& getInstance()
  {
    return getInstanceImpl();
  }
  static void init(std::string s) // enable moving in
  {
    getInstanceImpl(&s);
  }

  Questionnary(Questionnary const&) = delete;
  void operator=(Questionnary const&) = delete;
};

Source: stackoverflow.com

Similar codes

1 vote207 views1 answer
Std string to wstring
C++
0 vote211 views1 answer
C++ recorrer string
C++
0 vote176 views1 answer
Press enter to continue c++
C++
1 vote214 views1 answer
Enumerate with letters latex
C++
2 votes241 views1 answer
Lopping over an array c++
C++
1 vote232 views1 answer
Vector remove class
C++
5 votes203 views3 answers
Sql server convert utc to pst SQL command
C++
0 vote232 views1 answer
Lambda function qt connect
C++
0 vote221 views1 answer
Return the index where maximum element in a vector
C++
0 vote215 views1 answer
Header for INT_MIN
C++