c++11 tests.

decltype.cpp

#include <iostream>

using namespace std;

/* Test the decltype feature from c++11 */
/* /Soft/mag/dev/tools/gcc-4.7.1/bin/g++ --std=c++11 lambdas.cpp && ./a.out */

// You can't use decltype operator in the return declaration part (why??).
// You need to use it in a special form. After the arrow...
template <typename T1, typename T2>
auto add(T1 x, T2 y) -> decltype (x+y) { return x + y; }

int main()
{
  cout << "hello world." << endl;
  
  cout << "add() result is [" << add( 2 , 4 ) << "]." << endl;
}