C++ Auto

• The auto keyword is a C++11 feature. 
• Note:- Use "g++ -std=c++0x filename.cpp" to enable this feature.
• The compiler is able to determine the type of a variable from its initialization.
• With the advent of template types and template metaprogramming techniques, the type of something, particularly the well-defined return value of a function, may not be easily expressed. C++11 auto keyword provides a mitigation for this.
• auto is also useful for reducing the verbosity of the code.

Demonstrate the usage of "auto" keyword

#include <iostream>
#include <map>
using namespace std;

int main() {
   auto x = 100; // type of x is int
   
   map<int, string> employees;
   employees[100] = "John";
   
   map<int, string>::iterator iter1 = employees.begin(); // More verbose, prior to C++ 11
   auto iter2 = employees.begin(); // In C++ 11 using auto
   
   return 0;
}