1 | |
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2 | #ifndef BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED |
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3 | #define BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED |
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4 | |
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5 | // Copyright Aleksey Gurtovoy 2002-2004 |
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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_sequence.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ |
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14 | // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ |
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15 | // $Revision: 49267 $ |
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16 | |
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17 | #include <boost/mpl/not.hpp> |
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18 | #include <boost/mpl/and.hpp> |
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19 | #include <boost/mpl/begin_end.hpp> |
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20 | #include <boost/mpl/if.hpp> |
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21 | #include <boost/mpl/bool.hpp> |
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22 | #include <boost/mpl/sequence_tag_fwd.hpp> |
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23 | #include <boost/mpl/identity.hpp> |
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24 | #include <boost/mpl/void.hpp> |
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25 | #include <boost/mpl/aux_/has_tag.hpp> |
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26 | #include <boost/mpl/aux_/has_begin.hpp> |
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27 | #include <boost/mpl/aux_/na_spec.hpp> |
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28 | #include <boost/mpl/aux_/lambda_support.hpp> |
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29 | #include <boost/mpl/aux_/config/eti.hpp> |
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30 | #include <boost/mpl/aux_/config/msvc.hpp> |
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31 | #include <boost/mpl/aux_/config/workaround.hpp> |
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32 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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33 | # include <boost/mpl/aux_/msvc_is_class.hpp> |
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34 | #elif BOOST_WORKAROUND(BOOST_MSVC, == 1300) |
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35 | # include <boost/type_traits/is_class.hpp> |
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36 | #endif |
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37 | |
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38 | #include <boost/type_traits/is_same.hpp> |
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39 | |
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40 | namespace boost { namespace mpl { |
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41 | |
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42 | #if BOOST_WORKAROUND(BOOST_MSVC, <= 1300) |
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43 | |
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44 | namespace aux { |
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45 | |
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46 | // agurt, 11/jun/03: |
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47 | // MSVC 6.5/7.0 fails if 'has_begin' is instantiated on a class type that has a |
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48 | // 'begin' member that doesn't name a type; e.g. 'has_begin< std::vector<int> >' |
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49 | // would fail; requiring 'T' to have _both_ 'tag' and 'begin' members workarounds |
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50 | // the issue for most real-world cases |
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51 | template< typename T > struct is_sequence_impl |
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52 | : and_< |
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53 | identity< aux::has_tag<T> > |
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54 | , identity< aux::has_begin<T> > |
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55 | > |
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56 | { |
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57 | }; |
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58 | |
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59 | } // namespace aux |
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60 | |
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61 | template< |
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62 | typename BOOST_MPL_AUX_NA_PARAM(T) |
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63 | > |
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64 | struct is_sequence |
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65 | : if_< |
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66 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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67 | aux::msvc_is_class<T> |
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68 | #else |
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69 | boost::is_class<T> |
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70 | #endif |
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71 | , aux::is_sequence_impl<T> |
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72 | , bool_<false> |
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73 | >::type |
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74 | { |
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75 | BOOST_MPL_AUX_LAMBDA_SUPPORT(1, is_sequence, (T)) |
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76 | }; |
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77 | |
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78 | #elif defined(BOOST_MPL_CFG_NO_HAS_XXX) |
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79 | |
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80 | template< |
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81 | typename BOOST_MPL_AUX_NA_PARAM(T) |
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82 | > |
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83 | struct is_sequence |
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84 | : bool_<false> |
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85 | { |
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86 | }; |
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87 | |
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88 | #else |
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89 | |
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90 | template< |
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91 | typename BOOST_MPL_AUX_NA_PARAM(T) |
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92 | > |
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93 | struct is_sequence |
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94 | : not_< is_same< typename begin<T>::type, void_ > > |
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95 | { |
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96 | BOOST_MPL_AUX_LAMBDA_SUPPORT(1, is_sequence, (T)) |
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97 | }; |
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98 | |
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99 | #endif // BOOST_MSVC |
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100 | |
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101 | #if defined(BOOST_MPL_CFG_MSVC_60_ETI_BUG) |
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102 | template<> struct is_sequence<int> |
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103 | : bool_<false> |
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104 | { |
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105 | }; |
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106 | #endif |
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107 | |
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108 | BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, is_sequence) |
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109 | |
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110 | }} |
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111 | |
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112 | #endif // BOOST_MPL_IS_SEQUENCE_HPP_INCLUDED |
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