include/boost/json /detail /shared_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_DETAIL_SHARED_RESOURCE_HPP 10   #ifndef BOOST_JSON_DETAIL_SHARED_RESOURCE_HPP
11   #define BOOST_JSON_DETAIL_SHARED_RESOURCE_HPP 11   #define BOOST_JSON_DETAIL_SHARED_RESOURCE_HPP
12   12  
13   #include <boost/container/pmr/memory_resource.hpp> 13   #include <boost/container/pmr/memory_resource.hpp>
14   #include <atomic> 14   #include <atomic>
15   #include <utility> 15   #include <utility>
16   16  
17   namespace boost { 17   namespace boost {
18   namespace json { 18   namespace json {
19   namespace detail { 19   namespace detail {
20   20  
21   #ifdef _MSC_VER 21   #ifdef _MSC_VER
22   #pragma warning(push) 22   #pragma warning(push)
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   struct BOOST_SYMBOL_VISIBLE 26   struct BOOST_SYMBOL_VISIBLE
27   shared_resource 27   shared_resource
28   : container::pmr::memory_resource 28   : container::pmr::memory_resource
29   { 29   {
30   BOOST_JSON_DECL 30   BOOST_JSON_DECL
31   shared_resource(); 31   shared_resource();
32   32  
33   BOOST_JSON_DECL 33   BOOST_JSON_DECL
34   ~shared_resource(); 34   ~shared_resource();
35   35  
36   std::atomic<std::size_t> refs{ 1 }; 36   std::atomic<std::size_t> refs{ 1 };
37   }; 37   };
38   38  
39   template<class T> 39   template<class T>
40   class shared_resource_impl final 40   class shared_resource_impl final
41   : public shared_resource 41   : public shared_resource
42   { 42   {
43   T t; 43   T t;
44   44  
45   public: 45   public:
46   template<class... Args> 46   template<class... Args>
HITCBC 47   21 shared_resource_impl( 47   21 shared_resource_impl(
48   Args&&... args) 48   Args&&... args)
HITCBC 49   21 : t(std::forward<Args>(args)...) 49   21 : t(std::forward<Args>(args)...)
50   { 50   {
HITCBC 51   21 } 51   21 }
52   52  
53   void* 53   void*
HITCBC 54   49 do_allocate( 54   49 do_allocate(
55   std::size_t n, 55   std::size_t n,
56   std::size_t align) override 56   std::size_t align) override
57   { 57   {
HITCBC 58   49 return t.allocate(n, align); 58   49 return t.allocate(n, align);
59   } 59   }
60   60  
61   void 61   void
HITCBC 62   49 do_deallocate( 62   49 do_deallocate(
63   void* p, 63   void* p,
64   std::size_t n, 64   std::size_t n,
65   std::size_t align) override 65   std::size_t align) override
66   { 66   {
HITCBC 67   49 return t.deallocate(p, n, align); 67   49 return t.deallocate(p, n, align);
68   } 68   }
69   69  
70   bool 70   bool
HITCBC 71   12 do_is_equal( 71   12 do_is_equal(
72   memory_resource const&) const noexcept override 72   memory_resource const&) const noexcept override
73   { 73   {
74   // VFALCO Is always false ok? 74   // VFALCO Is always false ok?
HITCBC 75   12 return false; 75   12 return false;
76   } 76   }
77   }; 77   };
78   78  
79   #ifdef _MSC_VER 79   #ifdef _MSC_VER
80   #pragma warning(pop) 80   #pragma warning(pop)
81   #endif 81   #endif
82   82  
83   } // detail 83   } // detail
84   } // namespace json 84   } // namespace json
85   } // namespace boost 85   } // namespace boost
86   86  
87   #endif 87   #endif