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1 | /* Copyright 2006-2015 Joaquin M Lopez Munoz. |
2 | * Distributed under the Boost Software License, Version 1.0. | |
3 | * (See accompanying file LICENSE_1_0.txt or copy at | |
4 | * http://www.boost.org/LICENSE_1_0.txt) | |
5 | * | |
6 | * See http://www.boost.org/libs/flyweight for library home page. | |
7 | */ | |
8 | ||
9 | #ifndef BOOST_FLYWEIGHT_ASSOC_CONTAINER_FACTORY_HPP | |
10 | #define BOOST_FLYWEIGHT_ASSOC_CONTAINER_FACTORY_HPP | |
11 | ||
12 | #if defined(_MSC_VER) | |
13 | #pragma once | |
14 | #endif | |
15 | ||
16 | #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ | |
17 | #include <boost/flyweight/assoc_container_factory_fwd.hpp> | |
18 | #include <boost/flyweight/detail/is_placeholder_expr.hpp> | |
19 | #include <boost/flyweight/detail/nested_xxx_if_not_ph.hpp> | |
20 | #include <boost/flyweight/factory_tag.hpp> | |
21 | #include <boost/mpl/apply.hpp> | |
22 | #include <boost/mpl/aux_/lambda_support.hpp> | |
23 | #include <boost/mpl/if.hpp> | |
24 | ||
25 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
26 | #include <utility> | |
27 | #endif | |
28 | ||
29 | namespace boost{namespace flyweights{namespace detail{ | |
30 | BOOST_FLYWEIGHT_NESTED_XXX_IF_NOT_PLACEHOLDER_EXPRESSION_DEF(iterator) | |
31 | BOOST_FLYWEIGHT_NESTED_XXX_IF_NOT_PLACEHOLDER_EXPRESSION_DEF(value_type) | |
32 | }}} /* namespace boost::flyweights::detail */ | |
33 | ||
34 | /* Factory class using a given associative container. | |
35 | */ | |
36 | ||
37 | namespace boost{ | |
38 | ||
39 | namespace flyweights{ | |
40 | ||
41 | template<typename Container> | |
42 | class assoc_container_factory_class:public factory_marker | |
43 | { | |
44 | public: | |
45 | /* When assoc_container_factory_class<Container> is an MPL placeholder | |
46 | * expression, referring to Container::iterator and Container::value_type | |
47 | * force the MPL placeholder expression Container to be instantiated, which | |
48 | * is wasteful and can fail in concept-checked STL implementations. | |
49 | * We protect ourselves against this circumstance. | |
50 | */ | |
51 | ||
52 | typedef typename detail::nested_iterator_if_not_placeholder_expression< | |
53 | Container | |
54 | >::type handle_type; | |
55 | typedef typename detail::nested_value_type_if_not_placeholder_expression< | |
56 | Container | |
57 | >::type entry_type; | |
58 | ||
59 | handle_type insert(const entry_type& x) | |
60 | { | |
61 | return cont.insert(x).first; | |
62 | } | |
63 | ||
64 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
65 | handle_type insert(entry_type&& x) | |
66 | { | |
67 | return cont.insert(std::move(x)).first; | |
68 | } | |
69 | #endif | |
70 | ||
71 | void erase(handle_type h) | |
72 | { | |
73 | cont.erase(h); | |
74 | } | |
75 | ||
76 | static const entry_type& entry(handle_type h){return *h;} | |
77 | ||
78 | private: | |
79 | /* As above, avoid instantiating Container if it is an | |
80 | * MPL placeholder expression. | |
81 | */ | |
82 | ||
83 | typedef typename mpl::if_< | |
84 | detail::is_placeholder_expression<Container>, | |
85 | int, | |
86 | Container | |
87 | >::type container_type; | |
88 | container_type cont; | |
89 | ||
90 | public: | |
91 | typedef assoc_container_factory_class type; | |
92 | BOOST_MPL_AUX_LAMBDA_SUPPORT(1,assoc_container_factory_class,(Container)) | |
93 | }; | |
94 | ||
95 | /* assoc_container_factory_class specifier */ | |
96 | ||
97 | template< | |
98 | typename ContainerSpecifier | |
99 | BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION_DEF | |
100 | > | |
101 | struct assoc_container_factory:factory_marker | |
102 | { | |
103 | template<typename Entry,typename Key> | |
104 | struct apply | |
105 | { | |
106 | typedef assoc_container_factory_class< | |
107 | typename mpl::apply2<ContainerSpecifier,Entry,Key>::type | |
108 | > type; | |
109 | }; | |
110 | }; | |
111 | ||
112 | } /* namespace flyweights */ | |
113 | ||
114 | } /* namespace boost */ | |
115 | ||
116 | #endif |