How to initialize a private static const map in C++?

Question

I need just dictionary or associative array string => int.

There is type map C++ for this case.

But I need only one map forall instances(-> static) and this map can't be changed(-> const);

I have found this way with boost library

 std::map<int, char> example = 
      boost::assign::map_list_of(1, 'a') (2, 'b') (3, 'c');

Is there other solution without this lib? I have tried something like this, but there are always some issues with map initialization.

class myClass{
private:
    static map<int,int> create_map()
        {
          map<int,int> m;
          m[1] = 2;
          m[3] = 4;
          m[5] = 6;
          return m;
        }
    static map<int,int> myMap =  create_map();

};

Answer 1

The C++11 standard introduced uniform initialization which makes this much simpler if your compiler supports it:

//myClass.hpp
class myClass {
  private:
    static map<int,int> myMap;
};

//myClass.cpp
map<int,int> myClass::myMap = {
   {1, 2},
   {3, 4},
   {5, 6}
};

See also this section from Professional C++, on unordered_maps.