Resolving a static initialization order fiasco

Question

I am currently trying to resolve a static initialization order fiasco. This is in reference to my previous post link . I have a static method that populates the properties of a static container. Now one class in my project has a static property that retrieves a value from that static method. The problem is the static property of the class is called before the static method is initiated. My question is how can I resolve this issue. The code example is given below

//This is the code that has the static map container which is not initialized when 
//its queried by the OtherClass::mystring
Header File
class MyClass
{
    static std::map<std::string,std::string> config_map;
    static void SomeMethod();
};

Cpp File
std::map<std::string,std::string> MyClass::config_map ;

void MyClass::SomeMethod()
{
...
config_map.insert(std::pair<std::string,std::string>("dssd","Sdd")); //ERROR
}

Now some method is being called by the following porting

 Header File
    class OtherClass
    {
        static string mystring;
    };

    Cpp File
    std::string OtherClass::mystring = MyClass::config_map["something"]; // However config_map has not been initialized.

Could anyone explain whats the best method to resolve such a fiasco ? I have done some reading but I still cant understand it. Any suggestions or code example would definitely be appreciated.

Answer 1

declare a function and declare config_map as a static inside it

class MyClass {
...
  static std::map<std::string,std::string> & config_map() {
    static std::map<std::string,std::string> map;
    return map;
  }
};

void MyClass::SomeMethod()
{
...
config_map().insert(std::pair<std::string,std::string>("dssd","Sdd"));
}

std::string OtherClass::mystring = MyClass::config_map()["something"];

now map is guarantee to be initialized.