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

2 votes122 views2 answers
Cannot open include file:
C++
5 votes92 views1 answer
Master library in c++
C++
0 vote89 views1 answer
Number of characters in string
C++
0 vote131 views1 answer
C++ program transpose of matrix
C++
1 vote96 views1 answer
How to modify set C++
C++
0 vote124 views1 answer
Ubuntu dotnet create blazorserver linux
C++
0 vote52 views1 answer
SDL_BlitSurface
C++
9 votes88 views9 answers
Selection sort
C++
1 vote103 views1 answer
Stock a file in a vector cpp
C++
-1 vote97 views1 answer
#include
C++