C++ version 11 "auto"

[Barry Gold]

I've written a program that uses the STL, and recently came across the 
concept of automatic type determination. Which I think is *brilliant* btw.

My code includes the following:

In game.h:
map<string, string> idlist;

In Game.cpp:
void Game::addID(string id)
{
     auto eltp = idlist.find(id);
     if (eltp == map::end) {
         idlist.insert(pair<string,string>(id, id));
     } else {
         // Found in map, so it's a duplicate
         string emsg = "Duplicate ID: %s";
         emsg += id;
         yyerror(emsg);
     }
}

=====

My make log includes the following error message:

g++    -c -o Game.o Game.cpp
Game.cpp: In member function ‘void Game::addID(std::string)’:
Game.cpp:12:10: error: ‘eltp’ does not name a type
      auto eltp = idlist.find(id);
           ^
Game.cpp:13:9: error: ‘eltp’ was not declared in this scope
      if (eltp == map::end) {
          ^

This seems to imply that g++ is using the old meaning of "auto": 
allocate the variable on the stack. Yet my gcc/g++ identifies as version 
5.3.0, which the docs claim supports C++ version 11.

Do I have to add a command-line flag to enable C++ version 11 and/or the 
new meaning of "auto"?

FWIW, I'm using gcc in the gcc package of cygwin 2.5.0 (32-bit)



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