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