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1 | // |
2 | // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com) | |
3 | // | |
4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | // | |
7 | // Official repository: https://github.com/boostorg/json | |
8 | // | |
9 | ||
10 | #ifndef BOOST_JSON_DEFAULT_RESOURCE_HPP | |
11 | #define BOOST_JSON_DEFAULT_RESOURCE_HPP | |
12 | ||
13 | #include <boost/json/detail/config.hpp> | |
14 | #include <new> | |
15 | ||
16 | BOOST_JSON_NS_BEGIN | |
17 | namespace detail { | |
18 | ||
19 | #ifdef _MSC_VER | |
20 | #pragma warning(push) | |
21 | #pragma warning(disable: 4251) // class needs to have dll-interface to be used by clients of class | |
22 | #pragma warning(disable: 4275) // non dll-interface class used as base for dll-interface class | |
23 | #endif | |
24 | ||
25 | // A simple memory resource that uses operator new and delete. | |
26 | class | |
27 | BOOST_SYMBOL_VISIBLE | |
28 | BOOST_JSON_CLASS_DECL | |
29 | default_resource final | |
30 | : public memory_resource | |
31 | { | |
32 | union holder; | |
33 | ||
34 | #ifndef BOOST_JSON_WEAK_CONSTINIT | |
35 | # ifndef BOOST_JSON_NO_DESTROY | |
36 | static holder instance_; | |
37 | # else | |
38 | BOOST_JSON_NO_DESTROY | |
39 | static default_resource instance_; | |
40 | # endif | |
41 | #endif | |
42 | ||
43 | public: | |
44 | static | |
45 | memory_resource* | |
46 | get() noexcept | |
47 | { | |
48 | #ifdef BOOST_JSON_WEAK_CONSTINIT | |
49 | static default_resource instance_; | |
50 | #endif | |
51 | return reinterpret_cast<memory_resource*>( | |
52 | reinterpret_cast<std::uintptr_t*>( | |
53 | &instance_)); | |
54 | } | |
55 | ||
56 | ~default_resource(); | |
57 | ||
58 | void* | |
59 | do_allocate( | |
60 | std::size_t n, | |
61 | std::size_t) override; | |
62 | ||
63 | void | |
64 | do_deallocate( | |
65 | void* p, | |
66 | std::size_t, | |
67 | std::size_t) override; | |
68 | ||
69 | bool | |
70 | do_is_equal( | |
71 | memory_resource const& mr) const noexcept override; | |
72 | }; | |
73 | ||
74 | #ifdef _MSC_VER | |
75 | #pragma warning(pop) | |
76 | #endif | |
77 | ||
78 | union default_resource:: | |
79 | holder | |
80 | { | |
81 | #ifndef BOOST_JSON_WEAK_CONSTINIT | |
82 | constexpr | |
83 | #endif | |
84 | holder() | |
85 | : mr() | |
86 | { | |
87 | } | |
88 | ||
89 | ~holder() | |
90 | { | |
91 | } | |
92 | ||
93 | default_resource mr; | |
94 | }; | |
95 | ||
96 | } // detail | |
97 | BOOST_JSON_NS_END | |
98 | ||
99 | #endif |