1 // Boost.TypeErasure library 2 // 3 // Copyright 2011 Steven Watanabe 4 // 5 // Distributed under the Boost Software License Version 1.0. (See 6 // accompanying file LICENSE_1_0.txt or copy at 7 // http://www.boost.org/LICENSE_1_0.txt) 8 // 9 // $Id$ 10 11 #include <boost/type_erasure/builtin.hpp> 12 #include <boost/type_erasure/operators.hpp> 13 #include <boost/mpl/vector.hpp> 14 15 namespace mpl = boost::mpl; 16 using namespace boost::type_erasure; 17 18 //[compose1 19 /*` 20 Multiple concepts can be composed using an MPL sequence. 21 */ 22 template<class T = _self> 23 struct arithmetic : 24 mpl::vector< 25 copy_constructible<T>, 26 addable<T>, 27 subtractable<T>, 28 multipliable<T>, 29 dividable<T>, 30 equality_comparable<T>, 31 less_than_comparable<T> 32 > 33 {}; 34 /*` 35 Now, `arithmetic` is a concept that can be used just 36 like any of the base concepts. 37 */ 38 //] 39 40 //[compose 41 //` (For the source of the examples in this section see 42 //` [@boost:/libs/type_erasure/example/compose.cpp compose.cpp]) 43 //` [compose1] 44 //] 45