include/boost/json /detail /default_resource.hpp
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1   // 1   //
2   // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com) 2   // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
3   // 3   //
4   // Distributed under the Boost Software License, Version 1.0. (See accompanying 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) 5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6   // 6   //
7   // Official repository: https://github.com/boostorg/json 7   // Official repository: https://github.com/boostorg/json
8   // 8   //
9   9  
10   #ifndef BOOST_JSON_DEFAULT_RESOURCE_HPP 10   #ifndef BOOST_JSON_DEFAULT_RESOURCE_HPP
11   #define BOOST_JSON_DEFAULT_RESOURCE_HPP 11   #define BOOST_JSON_DEFAULT_RESOURCE_HPP
12   12  
13   #include <boost/json/detail/config.hpp> 13   #include <boost/json/detail/config.hpp>
14   #include <boost/container/pmr/memory_resource.hpp> 14   #include <boost/container/pmr/memory_resource.hpp>
15   15  
16   namespace boost { 16   namespace boost {
17   namespace json { 17   namespace json {
18   namespace detail { 18   namespace detail {
19   19  
20   #ifdef _MSC_VER 20   #ifdef _MSC_VER
21   #pragma warning(push) 21   #pragma warning(push)
22   #pragma warning(disable: 4251) // class needs to have dll-interface to be used by clients of class 22   #pragma warning(disable: 4251) // class needs to have dll-interface to be used by clients of class
23   #pragma warning(disable: 4275) // non dll-interface class used as base for dll-interface class 23   #pragma warning(disable: 4275) // non dll-interface class used as base for dll-interface class
24   #endif 24   #endif
25   25  
26   // A simple memory resource that uses operator new and delete. 26   // A simple memory resource that uses operator new and delete.
27   class 27   class
28   BOOST_SYMBOL_VISIBLE 28   BOOST_SYMBOL_VISIBLE
29   BOOST_JSON_DECL 29   BOOST_JSON_DECL
30   default_resource final 30   default_resource final
31   : public container::pmr::memory_resource 31   : public container::pmr::memory_resource
32   { 32   {
33   union holder; 33   union holder;
34   34  
35   #ifndef BOOST_JSON_WEAK_CONSTINIT 35   #ifndef BOOST_JSON_WEAK_CONSTINIT
36   # ifndef BOOST_JSON_NO_DESTROY 36   # ifndef BOOST_JSON_NO_DESTROY
37   static holder instance_; 37   static holder instance_;
38   # else 38   # else
39   BOOST_JSON_NO_DESTROY 39   BOOST_JSON_NO_DESTROY
40   static default_resource instance_; 40   static default_resource instance_;
41   # endif 41   # endif
42   #endif 42   #endif
43   43  
44   public: 44   public:
45   static 45   static
46   container::pmr::memory_resource* 46   container::pmr::memory_resource*
HITCBC 47   530848 get() noexcept 47   530848 get() noexcept
48   { 48   {
49   #ifdef BOOST_JSON_WEAK_CONSTINIT 49   #ifdef BOOST_JSON_WEAK_CONSTINIT
50   static default_resource instance_; 50   static default_resource instance_;
51   #endif 51   #endif
52   return reinterpret_cast<memory_resource*>( 52   return reinterpret_cast<memory_resource*>(
53   reinterpret_cast<std::uintptr_t*>( 53   reinterpret_cast<std::uintptr_t*>(
HITCBC 54   530848 &instance_)); 54   530848 &instance_));
55   } 55   }
56   56  
57   ~default_resource(); 57   ~default_resource();
58   58  
59   void* 59   void*
60   do_allocate( 60   do_allocate(
61   std::size_t n, 61   std::size_t n,
62   std::size_t) override; 62   std::size_t) override;
63   63  
64   void 64   void
65   do_deallocate( 65   do_deallocate(
66   void* p, 66   void* p,
67   std::size_t, 67   std::size_t,
68   std::size_t) override; 68   std::size_t) override;
69   69  
70   bool 70   bool
71   do_is_equal( 71   do_is_equal(
72   memory_resource const& mr) const noexcept override; 72   memory_resource const& mr) const noexcept override;
73   }; 73   };
74   74  
75   #ifdef _MSC_VER 75   #ifdef _MSC_VER
76   #pragma warning(pop) 76   #pragma warning(pop)
77   #endif 77   #endif
78   78  
79   union default_resource:: 79   union default_resource::
80   holder 80   holder
81   { 81   {
82   #ifndef BOOST_JSON_WEAK_CONSTINIT 82   #ifndef BOOST_JSON_WEAK_CONSTINIT
83   constexpr 83   constexpr
84   #endif 84   #endif
85   holder() 85   holder()
86   : mr() 86   : mr()
87   { 87   {
88   } 88   }
89   89  
HITCBC 90   39 ~holder() 90   39 ~holder()
91   { 91   {
HITCBC 92   39 } 92   39 }
93   93  
94   default_resource mr; 94   default_resource mr;
95   }; 95   };
96   96  
97   } // detail 97   } // detail
98   } // namespace json 98   } // namespace json
99   } // namespace boost 99   } // namespace boost
100   100  
101   #endif 101   #endif