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1
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2 #ifndef BOOST_MPL_MATH_IS_EVEN_HPP_INCLUDED
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3 #define BOOST_MPL_MATH_IS_EVEN_HPP_INCLUDED
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4
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5 // Copyright Aleksey Gurtovoy 2000-2004
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6 //
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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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10 //
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11 // See http://www.boost.org/libs/mpl for documentation.
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12
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13 // $Id: is_even.hpp 49267 2008-10-11 06:19:02Z agurtovoy $
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14 // $Date: 2008-10-10 23:19:02 -0700 (Fri, 10 Oct 2008) $
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15 // $Revision: 49267 $
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16
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17 #include <boost/mpl/bool.hpp>
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18 #include <boost/mpl/aux_/na_spec.hpp>
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19 #include <boost/mpl/aux_/lambda_support.hpp>
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20 #include <boost/mpl/aux_/config/msvc.hpp>
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21 #include <boost/mpl/aux_/config/workaround.hpp>
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22
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23 namespace boost { namespace mpl {
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24
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25 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
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26 namespace aux
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27 {
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28 template <class N>
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29 struct is_even_base
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30 {
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31 enum { value = (N::value % 2) == 0 };
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32 typedef bool_<value> type;
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33 };
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34 }
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35 #endif
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36
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37 template<
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38 typename BOOST_MPL_AUX_NA_PARAM(N)
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39 >
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40 struct is_even
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41 #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
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42 : aux::is_even_base<N>::type
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43 #else
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44 : bool_<((N::value % 2) == 0)>
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45 #endif
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46 {
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47 BOOST_MPL_AUX_LAMBDA_SUPPORT(1,is_even,(N))
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48 };
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49
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50 BOOST_MPL_AUX_NA_SPEC(1, is_even)
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51
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52 }}
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53
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54 #endif // BOOST_MPL_MATH_IS_EVEN_HPP_INCLUDED
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