1 /////////////////////////////////////////////////////////////////////////////
3 // (C) Copyright Ion Gaztanaga 2014-2014
5 // Distributed under the Boost Software License, Version 1.0.
6 // (See accompanying file LICENSE_1_0.txt or copy at
7 // http://www.boost.org/LICENSE_1_0.txt)
9 // See http://www.boost.org/libs/intrusive for documentation.
11 /////////////////////////////////////////////////////////////////////////////
13 #ifndef BOOST_INTRUSIVE_DETAIL_GET_VALUE_TRAITS_HPP
14 #define BOOST_INTRUSIVE_DETAIL_GET_VALUE_TRAITS_HPP
16 #ifndef BOOST_CONFIG_HPP
17 # include <boost/config.hpp>
20 #if defined(BOOST_HAS_PRAGMA_ONCE)
24 #include <boost/intrusive/detail/config_begin.hpp>
25 #include <boost/intrusive/detail/mpl.hpp>
26 #include <boost/intrusive/detail/hook_traits.hpp>
31 #ifndef BOOST_INTRUSIVE_DOXYGEN_INVOKED
33 template<class SupposedValueTraits>
34 struct is_default_hook_tag
35 { static const bool value = false; };
39 template <class T, class BaseHook>
40 struct concrete_hook_base_value_traits
42 typedef typename BaseHook::hooktags tags;
45 , typename tags::node_traits
51 template <class BaseHook>
52 struct concrete_hook_base_value_traits<void, BaseHook>
54 typedef typename BaseHook::hooktags type;
57 template <class T, class AnyToSomeHook_ProtoValueTraits>
58 struct any_hook_base_value_traits
60 //AnyToSomeHook value_traits derive from a generic_hook
61 //The generic_hook is configured with any_node_traits
62 //and AnyToSomeHook::value_traits with the correct
63 //node traits for the container, so use node_traits
64 //from AnyToSomeHook_ProtoValueTraits and the rest of
65 //elements from the hooktags member of the generic_hook
67 typedef typename AnyToSomeHook_ProtoValueTraits::basic_hook_t basic_hook_t;
68 typedef typename pointer_rebind
69 < typename basic_hook_t::hooktags::node_traits::node_ptr
70 , void>::type void_pointer;
71 typedef typename AnyToSomeHook_ProtoValueTraits::template
72 node_traits_from_voidptr<void_pointer>::type node_traits;
77 , basic_hook_t::hooktags::link_mode
78 , typename basic_hook_t::hooktags::tag
79 , basic_hook_t::hooktags::type
83 template <class AnyToSomeHook_ProtoValueTraits>
84 struct any_hook_base_value_traits<void, AnyToSomeHook_ProtoValueTraits>
86 typedef typename AnyToSomeHook_ProtoValueTraits::basic_hook_t basic_hook_t;
87 typedef typename pointer_rebind
88 < typename basic_hook_t::hooktags::node_traits::node_ptr
89 , void>::type void_pointer;
93 typedef typename AnyToSomeHook_ProtoValueTraits::template
94 node_traits_from_voidptr<void_pointer>::type node_traits;
98 template<class MemberHook>
99 struct get_member_value_traits
101 typedef typename MemberHook::member_value_traits type;
104 BOOST_INTRUSIVE_INTERNAL_STATIC_BOOL_IS_TRUE(internal_any_hook, is_any_hook)
105 BOOST_INTRUSIVE_INTERNAL_STATIC_BOOL_IS_TRUE(internal_base_hook, hooktags::is_base_hook)
108 struct internal_member_value_traits
110 template <class U> static yes_type test(...);
111 template <class U> static no_type test(typename U::member_value_traits* = 0);
112 static const bool value = sizeof(test<T>(0)) == sizeof(no_type);
115 template<class SupposedValueTraits, class T, bool = is_default_hook_tag<SupposedValueTraits>::value>
116 struct supposed_value_traits;
118 template<class T, class BaseHook, bool = internal_any_hook_bool_is_true<BaseHook>::value>
119 struct get_base_value_traits;
121 template<class SupposedValueTraits, class T, bool = internal_base_hook_bool_is_true<SupposedValueTraits>::value>
122 struct supposed_base_value_traits;
124 template<class SupposedValueTraits, bool = internal_member_value_traits<SupposedValueTraits>::value>
125 struct supposed_member_value_traits;
127 template<class SupposedValueTraits, bool = internal_any_hook_bool_is_true<SupposedValueTraits>::value>
128 struct any_or_concrete_value_traits;
131 template<class T, class BaseHook>
132 struct get_base_value_traits<T, BaseHook, true>
133 : any_hook_base_value_traits<T, BaseHook>
137 template<class T, class BaseHook>
138 struct get_base_value_traits<T, BaseHook, false>
139 : concrete_hook_base_value_traits<T, BaseHook>
142 //...It's a default hook
143 template<class SupposedValueTraits, class T>
144 struct supposed_value_traits<SupposedValueTraits, T, true>
145 { typedef typename SupposedValueTraits::template apply<T>::type type; };
147 //...Not a default hook
148 template<class SupposedValueTraits, class T>
149 struct supposed_value_traits<SupposedValueTraits, T, false>
150 { typedef SupposedValueTraits type; };
152 //...It's a base hook
153 template<class BaseHook, class T>
154 struct supposed_base_value_traits<BaseHook, T, true>
155 : get_base_value_traits<T, BaseHook>
158 //...Not a base hook, try if it's a member or value_traits
159 template<class SupposedValueTraits, class T>
160 struct supposed_base_value_traits<SupposedValueTraits, T, false>
161 : supposed_member_value_traits<SupposedValueTraits>
164 //...It's a member hook
165 template<class MemberHook>
166 struct supposed_member_value_traits<MemberHook, true>
167 : get_member_value_traits<MemberHook>
170 //...Not a member hook
171 template<class SupposedValueTraits>
172 struct supposed_member_value_traits<SupposedValueTraits, false>
173 : any_or_concrete_value_traits<SupposedValueTraits>
176 template<class AnyToSomeHook_ProtoValueTraits>
177 struct any_or_concrete_value_traits<AnyToSomeHook_ProtoValueTraits, true>
179 //A hook node (non-base, e.g.: member or other value traits
180 typedef typename AnyToSomeHook_ProtoValueTraits::basic_hook_t basic_hook_t;
181 typedef typename pointer_rebind
182 <typename basic_hook_t::node_ptr, void>::type void_pointer;
183 typedef typename AnyToSomeHook_ProtoValueTraits::template
184 node_traits_from_voidptr<void_pointer>::type any_node_traits;
186 struct type : basic_hook_t
188 typedef any_node_traits node_traits;
192 template<class SupposedValueTraits>
193 struct any_or_concrete_value_traits<SupposedValueTraits, false>
195 typedef SupposedValueTraits type;
198 ////////////////////////////////////////
199 // get_value_traits / get_node_traits
200 ////////////////////////////////////////
202 template<class T, class SupposedValueTraits>
203 struct get_value_traits
204 : supposed_base_value_traits<typename supposed_value_traits<SupposedValueTraits, T>::type, T>
207 template<class SupposedValueTraits>
208 struct get_node_traits
210 typedef typename get_value_traits<void, SupposedValueTraits>::type::node_traits type;
213 } //namespace detail{
215 #endif //BOOST_INTRUSIVE_DOXYGEN_INVOKED
217 } //namespace intrusive {
218 } //namespace boost {
220 #include <boost/intrusive/detail/config_end.hpp>
222 #endif //#ifndef BOOST_INTRUSIVE_DETAIL_GET_VALUE_TRAITS_HPP