| 1 | // Copyright David Abrahams, Daniel Wallin 2003. Use, modification and
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| 2 | // distribution is subject to the Boost Software License, Version 1.0.
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| 3 | // (See accompanying file LICENSE_1_0.txt or copy at
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| 4 | // http://www.boost.org/LICENSE_1_0.txt)
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| 5 |
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| 6 | #ifndef BOOST_PARAMETERS_031014_HPP
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| 7 | #define BOOST_PARAMETERS_031014_HPP
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| 8 |
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| 9 | #include <boost/detail/is_xxx.hpp>
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| 10 |
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| 11 | #include <boost/mpl/lambda.hpp>
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| 12 | #include <boost/mpl/apply.hpp>
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| 13 | #include <boost/mpl/always.hpp>
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| 14 | #include <boost/mpl/and.hpp>
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| 15 | #include <boost/mpl/or.hpp>
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| 16 | #include <boost/mpl/if.hpp>
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| 17 | #include <boost/mpl/identity.hpp>
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| 18 | #include <boost/mpl/not.hpp>
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| 19 | #include <boost/mpl/eval_if.hpp>
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| 20 |
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| 21 | #include <boost/type_traits/is_same.hpp>
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| 22 | #include <boost/type_traits/remove_reference.hpp>
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| 23 |
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| 24 | #include <boost/preprocessor/repetition/enum.hpp>
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| 25 | #include <boost/preprocessor/repetition/enum_params.hpp>
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| 26 | #include <boost/preprocessor/repetition/enum_trailing_params.hpp>
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| 27 | #include <boost/preprocessor/arithmetic/sub.hpp>
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| 28 | #include <boost/preprocessor/repetition/enum_shifted.hpp>
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| 29 | #include <boost/preprocessor/repetition/enum_binary_params.hpp>
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| 30 | #include <boost/preprocessor/repetition/enum_shifted_params.hpp>
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| 31 | #include <boost/preprocessor/seq/elem.hpp>
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| 32 | #include <boost/preprocessor/iteration/iterate.hpp>
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| 33 | #include <boost/preprocessor/facilities/intercept.hpp>
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| 34 | #include <boost/preprocessor/cat.hpp>
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| 35 |
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| 36 | #include <boost/parameter/aux_/arg_list.hpp>
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| 37 | #include <boost/parameter/aux_/yesno.hpp>
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| 38 | #include <boost/parameter/aux_/void.hpp>
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| 39 | #include <boost/parameter/aux_/default.hpp>
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| 40 | #include <boost/parameter/aux_/unwrap_cv_reference.hpp>
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| 41 | #include <boost/parameter/aux_/tagged_argument.hpp>
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| 42 | #include <boost/parameter/aux_/tag.hpp>
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| 43 | #include <boost/parameter/config.hpp>
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| 44 |
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| 45 |
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| 46 | namespace boost {
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| 47 |
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| 48 | template<class T> class reference_wrapper;
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| 49 |
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| 50 | namespace parameter {
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| 51 |
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| 52 | namespace aux { struct use_default {}; }
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| 53 |
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| 54 | // These templates can be used to describe the treatment of particular
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| 55 | // named parameters for the purposes of overload elimination with
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| 56 | // SFINAE, by placing specializations in the parameters<...> list. In
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| 57 | // order for a treated function to participate in overload resolution:
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| 58 | //
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| 59 | // - all keyword tags wrapped in required<...> must have a matching
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| 60 | // actual argument
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| 61 | //
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| 62 | // - The actual argument type matched by every keyword tag
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| 63 | // associated with a predicate must satisfy that predicate
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| 64 | //
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| 65 | // If a keyword k is specified without an optional<...> or
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| 66 | // required<...>, wrapper, it is treated as though optional<k> were
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| 67 | // specified.
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| 68 | //
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| 69 | template <class Tag, class Predicate = aux::use_default>
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| 70 | struct required
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| 71 | {
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| 72 | typedef Tag key_type;
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| 73 | typedef Predicate predicate;
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| 74 | };
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| 75 |
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| 76 | template <class Tag, class Predicate = aux::use_default>
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| 77 | struct optional
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| 78 | {
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| 79 | typedef Tag key_type;
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| 80 | typedef Predicate predicate;
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| 81 | };
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| 82 |
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| 83 | template <class Tag>
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| 84 | struct unnamed
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| 85 | {
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| 86 | typedef Tag key_type;
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| 87 | };
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| 88 |
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| 89 | namespace aux
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| 90 | {
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| 91 | // Defines metafunctions, is_required and is_optional, that
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| 92 | // identify required<...> and optional<...> specializations.
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| 93 | BOOST_DETAIL_IS_XXX_DEF(required, required, 2)
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| 94 | BOOST_DETAIL_IS_XXX_DEF(optional, optional, 2)
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| 95 |
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| 96 | //
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| 97 | // key_type, has_default, and predicate --
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| 98 | //
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| 99 | // These metafunctions accept a ParameterSpec and extract the
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| 100 | // keyword tag, whether or not a default is supplied for the
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| 101 | // parameter, and the predicate that the corresponding actual
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| 102 | // argument type is required match.
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| 103 | //
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| 104 | // a ParameterSpec is a specialization of either keyword<...>,
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| 105 | // required<...> or optional<...>.
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| 106 | //
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| 107 |
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| 108 | // helper for key_type<...>, below.
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| 109 | template <class T>
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| 110 | struct get_key_type
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| 111 | { typedef typename T::key_type type; };
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| 112 |
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| 113 | template <class T>
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| 114 | struct key_type
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| 115 | : mpl::eval_if<
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| 116 | mpl::or_<
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| 117 | is_optional<T>
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| 118 | , is_required<T>
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| 119 | >
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| 120 | , get_key_type<T>
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| 121 | , mpl::identity<T>
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| 122 | >
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| 123 | {
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| 124 | };
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| 125 |
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| 126 | template <class T>
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| 127 | struct has_default
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| 128 | : mpl::not_<typename is_required<T>::type>
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| 129 | {
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| 130 | };
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| 131 |
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| 132 | // helper for get_predicate<...>, below
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| 133 | template <class T>
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| 134 | struct get_predicate_or_default
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| 135 | {
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| 136 | typedef T type;
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| 137 | };
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| 138 |
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| 139 | template <>
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| 140 | struct get_predicate_or_default<use_default>
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| 141 | {
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| 142 | typedef mpl::always<mpl::true_> type;
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| 143 | };
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| 144 |
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| 145 | // helper for predicate<...>, below
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| 146 | template <class T>
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| 147 | struct get_predicate
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| 148 | {
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| 149 | typedef typename
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| 150 | get_predicate_or_default<typename T::predicate>::type
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| 151 | type;
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| 152 | };
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| 153 |
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| 154 | template <class T>
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| 155 | struct predicate
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| 156 | : mpl::eval_if<
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| 157 | mpl::or_<
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| 158 | is_optional<T>
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| 159 | , is_required<T>
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| 160 | >
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| 161 | , get_predicate<T>
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| 162 | , mpl::identity<mpl::always<mpl::true_> >
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| 163 | >
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| 164 | {
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| 165 | };
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| 166 |
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| 167 |
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| 168 | // Converts a ParameterSpec into a specialization of
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| 169 | // parameter_requirements. We need to do this in order to get the
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| 170 | // key_type into the type in a way that can be conveniently matched
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| 171 | // by a satisfies(...) member function in arg_list.
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| 172 | template <class ParameterSpec>
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| 173 | struct as_parameter_requirements
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| 174 | {
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| 175 | typedef parameter_requirements<
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| 176 | typename key_type<ParameterSpec>::type
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| 177 | , typename predicate<ParameterSpec>::type
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| 178 | , typename has_default<ParameterSpec>::type
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| 179 | > type;
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| 180 | };
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| 181 |
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| 182 | // Labels Arg with default keyword tag DefaultTag if it is not
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| 183 | // already a tagged_argument
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| 184 | template <class DefaultTag, class Arg>
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| 185 | struct as_tagged_argument
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| 186 | : mpl::eval_if<
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| 187 | is_tagged_argument<Arg>
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| 188 | , mpl::identity<Arg>
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| 189 | , tag<typename key_type<DefaultTag>::type, Arg const>
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| 190 | >
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| 191 | {};
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| 192 |
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| 193 | #if BOOST_WORKAROUND(BOOST_MSVC, == 1200) // ETI workaround
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| 194 | template <>
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| 195 | struct as_tagged_argument<int,int>
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| 196 | {
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| 197 | typedef int type;
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| 198 | };
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| 199 | #endif
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| 200 |
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| 201 | // Returns mpl::true_ iff the given ParameterRequirements are
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| 202 | // satisfied by ArgList.
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| 203 | template <class ArgList, class ParameterRequirements>
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| 204 | struct satisfies
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| 205 | {
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| 206 | #if BOOST_WORKAROUND(BOOST_MSVC, == 1310)
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| 207 | // VC7.1 can't handle the sizeof() implementation below,
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| 208 | // so we use this instead.
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| 209 | typedef typename mpl::apply_wrap2<
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| 210 | typename ArgList::binding
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| 211 | , typename ParameterRequirements::keyword
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| 212 | , void_
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| 213 | >::type bound;
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| 214 |
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| 215 | typedef typename mpl::eval_if<
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| 216 | is_same<bound, void_>
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| 217 | , typename ParameterRequirements::has_default
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| 218 | , mpl::apply1<
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| 219 | typename ParameterRequirements::predicate
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| 220 | , typename remove_reference<bound>::type
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| 221 | >
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| 222 | >::type type;
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| 223 | #else
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| 224 | BOOST_STATIC_CONSTANT(
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| 225 | bool, value = (
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| 226 | sizeof(
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| 227 | aux::to_yesno(
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| 228 | ArgList::satisfies((ParameterRequirements*)0)
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| 229 | )
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| 230 | ) == sizeof(yes_tag)
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| 231 | )
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| 232 | );
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| 233 |
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| 234 | typedef mpl::bool_<satisfies::value> type;
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| 235 | #endif
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| 236 | };
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| 237 |
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| 238 | // Returns mpl::true_ if the requirements of the given ParameterSpec
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| 239 | // are satisfied by ArgList.
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| 240 | template <class ArgList, class ParameterSpec>
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| 241 | struct satisfies_requirements_of
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| 242 | : satisfies<
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| 243 | ArgList
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| 244 | , typename as_parameter_requirements<ParameterSpec>::type
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| 245 | >
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| 246 | {};
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| 247 |
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| 248 | // Helper for make_partial_arg_list, below. Produce an arg_list
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| 249 | // node for the given ParameterSpec and ArgumentType, whose tail is
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| 250 | // determined by invoking the nullary metafunction TailFn.
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| 251 | template <class ParameterSpec, class ArgumentType, class TailFn>
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| 252 | struct make_arg_list
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| 253 | {
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| 254 | typedef arg_list<
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| 255 | typename as_tagged_argument<ParameterSpec,ArgumentType>::type
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| 256 | , typename TailFn::type
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| 257 | > type;
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| 258 | };
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| 259 |
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| 260 | // Just like make_arg_list, except if ArgumentType is void_, the
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| 261 | // result is empty_arg_list. Used to build arg_lists whose length
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| 262 | // depends on the number of non-default (void_) arguments passed to
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| 263 | // a class template.
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| 264 | template <
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| 265 | class ParameterSpec
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| 266 | , class ArgumentType
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| 267 | , class TailFn
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| 268 | >
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| 269 | struct make_partial_arg_list
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| 270 | : mpl::eval_if<
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| 271 | is_same<ArgumentType,void_>
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| 272 | , mpl::identity<empty_arg_list>
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| 273 | , make_arg_list<ParameterSpec, ArgumentType, TailFn>
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| 274 | >
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| 275 | {};
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| 276 |
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| 277 | // Generates:
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| 278 | //
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| 279 | // make<
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| 280 | // parameter_spec#0, argument_type#0
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| 281 | // , make<
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| 282 | // parameter_spec#1, argument_type#1
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| 283 | // , ... mpl::identity<aux::empty_arg_list>
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| 284 | // ...>
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| 285 | // >
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| 286 | #define BOOST_PARAMETER_make_arg_list(z, n, names) \
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| 287 | BOOST_PP_SEQ_ELEM(0,names)< \
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| 288 | BOOST_PP_CAT(BOOST_PP_SEQ_ELEM(1,names), n), \
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| 289 | BOOST_PP_CAT(BOOST_PP_SEQ_ELEM(2,names), n),
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| 290 |
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| 291 | #define BOOST_PARAMETER_right_angle(z, n, text) >
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| 292 |
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| 293 | #define BOOST_PARAMETER_build_arg_list(n, make, parameter_spec, argument_type) \
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| 294 | BOOST_PP_REPEAT( \
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| 295 | n, BOOST_PARAMETER_make_arg_list, (make)(parameter_spec)(argument_type)) \
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| 296 | mpl::identity<aux::empty_arg_list> \
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| 297 | BOOST_PP_REPEAT(n, BOOST_PARAMETER_right_angle, _)
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| 298 |
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| 299 | } // namespace aux
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| 300 |
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| 301 | #define BOOST_PARAMETER_TEMPLATE_ARGS(z, n, text) class BOOST_PP_CAT(PS, n) = aux::void_
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| 302 |
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| 303 | template<
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| 304 | class PS0
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| 305 | , BOOST_PP_ENUM_SHIFTED(BOOST_PARAMETER_MAX_ARITY, BOOST_PARAMETER_TEMPLATE_ARGS, _)
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| 306 | >
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| 307 | struct parameters
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| 308 | {
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| 309 | #undef BOOST_PARAMETER_TEMPLATE_ARGS
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| 310 |
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| 311 | // if the elements of NamedList match the criteria of overload
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| 312 | // resolution, returns a type which can be constructed from
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| 313 | // parameters. Otherwise, this is not a valid metafunction (no nested
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| 314 | // ::type).
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| 315 |
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| 316 |
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| 317 | #ifndef BOOST_NO_SFINAE
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| 318 | // If NamedList satisfies the PS0, PS1, ..., this is a
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| 319 | // metafunction returning parameters. Otherwise it
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| 320 | // has no nested ::type.
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| 321 | template <class NamedList>
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| 322 | struct match_base
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| 323 | : mpl::if_<
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| 324 | // mpl::and_<
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| 325 | // aux::satisfies_requirements_of<NamedList,PS0>
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| 326 | // , mpl::and_<
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| 327 | // aux::satisfies_requirements_of<NamedList,PS1>...
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| 328 | // ..., mpl::true_
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| 329 | // ...> >
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| 330 |
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| 331 | # define BOOST_PARAMETER_satisfies(z, n, text) \
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| 332 | mpl::and_< \
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| 333 | aux::satisfies_requirements_of<NamedList, BOOST_PP_CAT(PS, n)> ,
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| 334 |
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| 335 | BOOST_PP_REPEAT(BOOST_PARAMETER_MAX_ARITY, BOOST_PARAMETER_satisfies, _)
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| 336 | mpl::true_
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| 337 | BOOST_PP_REPEAT(BOOST_PARAMETER_MAX_ARITY, BOOST_PARAMETER_right_angle, _)
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| 338 |
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| 339 | # undef BOOST_PARAMETER_satisfies
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| 340 |
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| 341 | , mpl::identity<parameters>
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| 342 | , aux::void_
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| 343 | >
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| 344 | {};
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| 345 | #endif
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| 346 |
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| 347 | // Specializations are to be used as an optional argument to
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| 348 | // eliminate overloads via SFINAE
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| 349 | template<
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| 350 | #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
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| 351 | // Borland simply can't handle default arguments in member
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| 352 | // class templates. People wishing to write portable code can
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| 353 | // explicitly specify BOOST_PARAMETER_MAX_ARITY arguments
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| 354 | BOOST_PP_ENUM_PARAMS(BOOST_PARAMETER_MAX_ARITY, class A)
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| 355 | #else
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| 356 | BOOST_PP_ENUM_BINARY_PARAMS(
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| 357 | BOOST_PARAMETER_MAX_ARITY, class A, = aux::void_ BOOST_PP_INTERCEPT
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| 358 | )
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| 359 | #endif
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| 360 | >
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| 361 | struct match
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| 362 | # ifndef BOOST_NO_SFINAE
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| 363 | : match_base<
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| 364 | typename BOOST_PARAMETER_build_arg_list(
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| 365 | BOOST_PARAMETER_MAX_ARITY, aux::make_partial_arg_list, PS, A
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| 366 | )::type
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| 367 | >::type
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| 368 | {};
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| 369 | # else
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| 370 | {
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| 371 | typedef parameters<
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| 372 | BOOST_PP_ENUM_PARAMS(BOOST_PARAMETER_MAX_ARITY, PS)
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| 373 | > type;
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| 374 | };
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| 375 | # endif
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| 376 |
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| 377 | //
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| 378 | // The function call operator is used to build an arg_list that
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| 379 | // labels the positional parameters and maintains whatever other
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| 380 | // tags may have been specified by the caller.
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| 381 | //
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| 382 | aux::empty_arg_list operator()() const
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| 383 | {
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| 384 | return aux::empty_arg_list();
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| 385 | }
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| 386 |
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| 387 | template<class A0>
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| 388 | typename
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| 389 | aux::make_arg_list<PS0,A0, mpl::identity<aux::empty_arg_list> >
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| 390 | ::type
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| 391 | operator()( A0 const& a0) const
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| 392 | {
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| 393 | typedef typename
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| 394 | aux::make_arg_list<PS0, A0, mpl::identity<aux::empty_arg_list> >
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| 395 | ::type result_type;
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| 396 |
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| 397 | return result_type(
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| 398 | a0
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| 399 | // , void_(), void_(), void_() ...
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| 400 | BOOST_PP_ENUM_TRAILING_PARAMS(
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| 401 | BOOST_PP_SUB(BOOST_PARAMETER_MAX_ARITY, 1)
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| 402 | , aux::void_() BOOST_PP_INTERCEPT)
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| 403 | );
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| 404 | }
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| 405 |
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| 406 | template<class A0, class A1>
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| 407 | typename
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| 408 | aux::make_arg_list<
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| 409 | PS0,A0
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| 410 | , aux::make_arg_list<
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| 411 | PS1,A1
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| 412 | , mpl::identity<aux::empty_arg_list>
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| 413 | >
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| 414 | >
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| 415 | ::type
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| 416 | operator()(A0 const& a0, A1 const& a1) const
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| 417 | {
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| 418 | typedef typename
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| 419 | aux::make_arg_list<
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| 420 | PS0,A0
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| 421 | , aux::make_arg_list<
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| 422 | PS1,A1
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| 423 | , mpl::identity<aux::empty_arg_list>
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| 424 | >
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| 425 | >
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| 426 | ::type result_type;
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| 427 |
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| 428 |
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| 429 | return result_type(
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| 430 | a0, a1
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| 431 | // , void_(), void_() ...
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| 432 | BOOST_PP_ENUM_TRAILING_PARAMS(
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| 433 | BOOST_PP_SUB(BOOST_PARAMETER_MAX_ARITY, 2)
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| 434 | , aux::void_() BOOST_PP_INTERCEPT)
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| 435 | );
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| 436 | }
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| 437 |
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| 438 | // Higher arities are handled by the preprocessor
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| 439 | #define BOOST_PP_ITERATION_PARAMS_1 (3,( \
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| 440 | 3,BOOST_PARAMETER_MAX_ARITY,<boost/parameter/aux_/overloads.hpp> \
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| 441 | ))
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|---|
| 442 | #include BOOST_PP_ITERATE()
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| 443 |
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| 444 | #undef BOOST_PARAMETER_build_arg_list
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| 445 | #undef BOOST_PARAMETER_make_arg_list
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| 446 | #undef BOOST_PARAMETER_right_angle
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|---|
| 447 |
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|---|
| 448 | };
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|---|
| 449 |
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| 450 | } // namespace parameter
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|---|
| 451 |
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| 452 | } // namespace boost
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|---|
| 453 |
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| 454 | #endif // BOOST_PARAMETERS_031014_HPP
|
|---|
| 455 |
|
|---|
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