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1 // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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2 // (C) Copyright 2003-2007 Jonathan Turkanis
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3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
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4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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5
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6 // See http://www.boost.org/libs/iostreams for documentation.
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7
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8 // Contains the metafunction select, which mimics the effect of a chain of
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9 // nested mpl if_'s.
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10 //
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11 // -----------------------------------------------------------------------------
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12 //
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13 // Usage:
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14 //
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15 // typedef typename select<
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16 // case1, type1,
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17 // case2, type2,
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18 // ...
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19 // true_, typen
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20 // >::type selection;
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21 //
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22 // Here case1, case2, ... are models of MPL::IntegralConstant with value type
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23 // bool, and n <= 12.
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24
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25 #ifndef BOOST_IOSTREAMS_SELECT_HPP_INCLUDED
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26 #define BOOST_IOSTREAMS_SELECT_HPP_INCLUDED
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27
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28 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
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29 # pragma once
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30 #endif
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31
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32 #include <boost/type_traits/is_base_and_derived.hpp>
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33 #include <boost/mpl/eval_if.hpp>
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34 #include <boost/mpl/identity.hpp>
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35 #include <boost/mpl/if.hpp>
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36 #include <boost/mpl/void.hpp>
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37
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38 namespace boost { namespace iostreams {
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39
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40 typedef mpl::true_ else_;
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41
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42 template< typename Case1 = mpl::true_,
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43 typename Type1 = mpl::void_,
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44 typename Case2 = mpl::true_,
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45 typename Type2 = mpl::void_,
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46 typename Case3 = mpl::true_,
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47 typename Type3 = mpl::void_,
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48 typename Case4 = mpl::true_,
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49 typename Type4 = mpl::void_,
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50 typename Case5 = mpl::true_,
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51 typename Type5 = mpl::void_,
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52 typename Case6 = mpl::true_,
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53 typename Type6 = mpl::void_,
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54 typename Case7 = mpl::true_,
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55 typename Type7 = mpl::void_,
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56 typename Case8 = mpl::true_,
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57 typename Type8 = mpl::void_,
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58 typename Case9 = mpl::true_,
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59 typename Type9 = mpl::void_,
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60 typename Case10 = mpl::true_,
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61 typename Type10 = mpl::void_,
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62 typename Case11 = mpl::true_,
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63 typename Type11 = mpl::void_,
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64 typename Case12 = mpl::true_,
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65 typename Type12 = mpl::void_ >
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66 struct select {
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67 typedef typename
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68 mpl::eval_if<
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69 Case1, mpl::identity<Type1>, mpl::eval_if<
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70 Case2, mpl::identity<Type2>, mpl::eval_if<
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71 Case3, mpl::identity<Type3>, mpl::eval_if<
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72 Case4, mpl::identity<Type4>, mpl::eval_if<
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73 Case5, mpl::identity<Type5>, mpl::eval_if<
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74 Case6, mpl::identity<Type6>, mpl::eval_if<
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75 Case7, mpl::identity<Type7>, mpl::eval_if<
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76 Case8, mpl::identity<Type8>, mpl::eval_if<
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77 Case9, mpl::identity<Type9>, mpl::eval_if<
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78 Case10, mpl::identity<Type10>, mpl::eval_if<
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79 Case11, mpl::identity<Type11>, mpl::if_<
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80 Case12, Type12, mpl::void_ > > > > > > > > > > >
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81 >::type type;
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82 };
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83
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84 } } // End namespaces iostreams, boost.
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85
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86 #endif // #ifndef BOOST_IOSTREAMS_SELECT_HPP_INCLUDED
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