include/boost/json /impl /null_resource.ipp
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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_IMPL_NULL_RESOURCE_IPP 10   #ifndef BOOST_JSON_IMPL_NULL_RESOURCE_IPP
11   #define BOOST_JSON_IMPL_NULL_RESOURCE_IPP 11   #define BOOST_JSON_IMPL_NULL_RESOURCE_IPP
12   12  
13   #include <boost/json/null_resource.hpp> 13   #include <boost/json/null_resource.hpp>
14   #include <boost/throw_exception.hpp> 14   #include <boost/throw_exception.hpp>
15   15  
16   namespace boost { 16   namespace boost {
17   namespace json { 17   namespace json {
18   18  
19   namespace detail { 19   namespace detail {
20   20  
21   /** A resource which always fails. 21   /** A resource which always fails.
22   22  
23   This memory resource always throws the exception 23   This memory resource always throws the exception
24   `std::bad_alloc` in calls to `allocate`. 24   `std::bad_alloc` in calls to `allocate`.
25   */ 25   */
26   class null_resource final 26   class null_resource final
27   : public container::pmr::memory_resource 27   : public container::pmr::memory_resource
28   { 28   {
29   public: 29   public:
30   /// Copy constructor (deleted) 30   /// Copy constructor (deleted)
31   null_resource( 31   null_resource(
32   null_resource const&) = delete; 32   null_resource const&) = delete;
33   33  
34   /// Copy assignment (deleted) 34   /// Copy assignment (deleted)
35   null_resource& operator=( 35   null_resource& operator=(
36   null_resource const&) = delete; 36   null_resource const&) = delete;
37   37  
38   /** Constructor 38   /** Constructor
39   39  
40   This constructs the resource. 40   This constructs the resource.
41   41  
42   @par Complexity 42   @par Complexity
43   Constant. 43   Constant.
44   44  
45   @par Exception Safety 45   @par Exception Safety
46   No-throw guarantee. 46   No-throw guarantee.
47   */ 47   */
48   /** @{ */ 48   /** @{ */
49   null_resource() noexcept = default; 49   null_resource() noexcept = default;
50   50  
51   protected: 51   protected:
52   void* 52   void*
HITCBC 53   3 do_allocate( 53   3 do_allocate(
54   std::size_t, 54   std::size_t,
55   std::size_t) override 55   std::size_t) override
56   { 56   {
HITCBC 57   6 throw_exception( std::bad_alloc(), BOOST_CURRENT_LOCATION ); 57   6 throw_exception( std::bad_alloc(), BOOST_CURRENT_LOCATION );
58   } 58   }
59   59  
60   void 60   void
HITCBC 61   1 do_deallocate( 61   1 do_deallocate(
62   void*, 62   void*,
63   std::size_t, 63   std::size_t,
64   std::size_t) override 64   std::size_t) override
65   { 65   {
66   // do nothing 66   // do nothing
HITCBC 67   1 } 67   1 }
68   68  
69   bool 69   bool
MISUBC 70   ✗ do_is_equal( 70   ✗ do_is_equal(
71   memory_resource const& mr 71   memory_resource const& mr
72   ) const noexcept override 72   ) const noexcept override
73   { 73   {
MISUBC 74   ✗ return this == &mr; 74   ✗ return this == &mr;
75   } 75   }
76   }; 76   };
77   77  
78   } // detail 78   } // detail
79   79  
80   container::pmr::memory_resource* 80   container::pmr::memory_resource*
HITCBC 81   10 get_null_resource() noexcept 81   10 get_null_resource() noexcept
82   { 82   {
HITCBC 83   10 static detail::null_resource mr; 83   10 static detail::null_resource mr;
HITCBC 84   10 return &mr; 84   10 return &mr;
85   } 85   }
86   86  
87   } // namespace json 87   } // namespace json
88   } // namespace boost 88   } // namespace boost
89   89  
90   #endif 90   #endif