1 // Copyright (C) 2003, Fernando Luis Cacciola Carballal. 2 // 3 // Use, modification, and distribution is subject to the Boost Software 4 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 5 // http://www.boost.org/LICENSE_1_0.txt) 6 // 7 // See http://www.boost.org/lib/optional for documentation. 8 // 9 // You are welcome to contact the author at: 10 // [email protected] 11 // 12 #include<string> 13 14 #include "boost/optional.hpp" 15 16 struct A {} ; 17 struct B {} ; 18 // 19 // THIS TEST SHOULD FAIL TO COMPILE 20 // test_no_unsupported_conversion()21void test_no_unsupported_conversion() 22 { 23 boost::optional<A> opt1; 24 boost::optional<B> opt2; 25 opt2 = opt1 ; // Cannot convert from "A" to "B" 26 } 27 28 29