boost_optional/test/optional_test_fail2.cpp

// (C) 2003, Fernando Luis Cacciola Carballal.
//
// This material is provided "as is", with absolutely no warranty expressed
// or implied. Any use is at your own risk.
//
// Permission to use or copy this software for any purpose is hereby granted
// without fee, provided the above notices are retained on all copies.
// Permission to modify the code and to distribute modified code is granted,
// provided the above notices are retained, and a notice that the code was
// modified is included with the above copyright notice.
//
// You are welcome to contact the author at:
//  fernando_cacciola@hotmail.com
//
#include "boost/optional.hpp"

//
// THIS TEST SHOULD FAIL TO COMPILE
//
void test_no_implicit_conversion()
{
  boost::optional<int> opt(1) ;

  // You can compare against 0 or against another optional<>,
  // but not against another value
  if ( opt == 1 ) ;
}