2 #ifndef BOOST_MPL_FOR_EACH_HPP_INCLUDED
3 #define BOOST_MPL_FOR_EACH_HPP_INCLUDED
5 // Copyright Aleksey Gurtovoy 2000-2008
7 // Distributed under the Boost Software License, Version 1.0.
8 // (See accompanying file LICENSE_1_0.txt or copy at
9 // http://www.boost.org/LICENSE_1_0.txt)
11 // See http://www.boost.org/libs/mpl for documentation.
13 // $Id: for_each.hpp 55648 2009-08-18 05:16:53Z agurtovoy $
14 // $Date: 2009-08-18 01:16:53 -0400 (Tue, 18 Aug 2009) $
17 #include <boost/mpl/is_sequence.hpp>
18 #include <boost/mpl/begin_end.hpp>
19 #include <boost/mpl/apply.hpp>
20 #include <boost/mpl/bool.hpp>
21 #include <boost/mpl/next_prior.hpp>
22 #include <boost/mpl/deref.hpp>
23 #include <boost/mpl/identity.hpp>
24 #include <boost/mpl/assert.hpp>
25 #include <boost/mpl/aux_/unwrap.hpp>
27 #include <boost/type_traits/is_same.hpp>
28 #include <boost/utility/value_init.hpp>
30 namespace boost { namespace mpl {
34 template< bool done = true >
39 , typename LastIterator
40 , typename TransformFunc
54 struct for_each_impl<false>
58 , typename LastIterator
59 , typename TransformFunc
69 typedef typename deref<Iterator>::type item;
70 typedef typename apply1<TransformFunc,item>::type arg;
72 // dwa 2002/9/10 -- make sure not to invoke undefined behavior
74 value_initialized<arg> x;
75 aux::unwrap(f, 0)(boost::get(x));
77 typedef typename mpl::next<Iterator>::type iter;
78 for_each_impl<boost::is_same<iter,LastIterator>::value>
79 ::execute( static_cast<iter*>(0), static_cast<LastIterator*>(0), static_cast<TransformFunc*>(0), f);
85 // agurt, 17/mar/02: pointer default parameters are necessary to workaround
86 // MSVC 6.5 function template signature's mangling bug
89 , typename TransformOp
93 void for_each(F f, Sequence* = 0, TransformOp* = 0)
95 BOOST_MPL_ASSERT(( is_sequence<Sequence> ));
97 typedef typename begin<Sequence>::type first;
98 typedef typename end<Sequence>::type last;
100 aux::for_each_impl< boost::is_same<first,last>::value >
101 ::execute(static_cast<first*>(0), static_cast<last*>(0), static_cast<TransformOp*>(0), f);
109 void for_each(F f, Sequence* = 0)
111 for_each<Sequence, identity<> >(f);
116 #endif // BOOST_MPL_FOR_EACH_HPP_INCLUDED