Creating a set<char> in C++

Question

I am coding this thing and it would be helpful to have a static const set<char> containing some elements that won't change.

class MyClass {
     private:
         static const set<char> mySet = ??  
}

How can I do this? It would be nice if you could create them from a string, like mySet("ABC"), but I can't get the syntax to work.

Answer 1

Something like this will work just fine:

// my_class.h
class MyClass
{
  static const std::set<char> mySet;
};

// my_class.cpp
const char *tmp = "ABCDEFGHI";
const std::set<char> MyClass::mySet(tmp,tmp+strlen(tmp));

Answer 2

Something like the following ought to work..

#include <iostream>
#include <set>

struct foo
{
  static std::set<char> init_chars();

  static const std::set<char> myChars;
};

const std::set<char> foo::myChars = foo::init_chars();

std::set<char> foo::init_chars()
{
  std::string sl("ABDCEDFG");
  return std::set<char>(sl.begin(), sl.end());
}

int main()
{
  std::cout << foo::myChars.size() << std::endl;
  return 0;
}