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1 | /* Copyright 2006-2014 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_DETAIL_DEFAULT_VALUE_POLICY_HPP | |
10 | #define BOOST_FLYWEIGHT_DETAIL_DEFAULT_VALUE_POLICY_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/detail/workaround.hpp> | |
18 | #include <boost/flyweight/detail/perfect_fwd.hpp> | |
19 | #include <boost/flyweight/detail/value_tag.hpp> | |
20 | ||
21 | /* Default value policy: the key is the same as the value. | |
22 | */ | |
23 | ||
24 | namespace boost{ | |
25 | ||
26 | namespace flyweights{ | |
27 | ||
28 | namespace detail{ | |
29 | ||
30 | template<typename Value> | |
31 | struct default_value_policy:value_marker | |
32 | { | |
33 | typedef Value key_type; | |
34 | typedef Value value_type; | |
35 | ||
36 | struct rep_type | |
37 | { | |
38 | /* template ctors */ | |
39 | ||
40 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)&&\ | |
41 | !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES)&&\ | |
42 | BOOST_WORKAROUND(__GNUC__,<=4)&&(__GNUC__<4||__GNUC_MINOR__<=4) | |
43 | ||
44 | /* GCC 4.4.2 (and probably prior) bug: the default ctor generated by the | |
45 | * variadic temmplate ctor below fails to value-initialize x. | |
46 | */ | |
47 | ||
48 | rep_type():x(){} | |
49 | #endif | |
50 | ||
51 | #define BOOST_FLYWEIGHT_PERFECT_FWD_CTR_BODY(args) \ | |
52 | :x(BOOST_FLYWEIGHT_FORWARD(args)){} | |
53 | ||
54 | BOOST_FLYWEIGHT_PERFECT_FWD( | |
55 | explicit rep_type, | |
56 | BOOST_FLYWEIGHT_PERFECT_FWD_CTR_BODY) | |
57 | ||
58 | #undef BOOST_FLYWEIGHT_PERFECT_FWD_CTR_BODY | |
59 | ||
60 | rep_type(const rep_type& r):x(r.x){} | |
61 | ||
62 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
63 | rep_type(rep_type&& r):x(std::move(r.x)){} | |
64 | #endif | |
65 | ||
66 | operator const value_type&()const{return x;} | |
67 | ||
68 | value_type x; | |
69 | }; | |
70 | ||
71 | static void construct_value(const rep_type&){} | |
72 | static void copy_value(const rep_type&){} | |
73 | ||
74 | #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
75 | static void move_value(const rep_type&){} | |
76 | #endif | |
77 | }; | |
78 | ||
79 | } /* namespace flyweights::detail */ | |
80 | ||
81 | } /* namespace flyweights */ | |
82 | ||
83 | } /* namespace boost */ | |
84 | ||
85 | #endif |