. /include/boost/capy /detail /run.hpp
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1   // 1   //
2   // Copyright (c) 2025 Vinnie Falco (vinnie.falco@gmail.com) 2   // Copyright (c) 2025 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/cppalliance/capy 7   // Official repository: https://github.com/cppalliance/capy
8   // 8   //
9   9  
10   #ifndef BOOST_CAPY_DETAIL_RUN_HPP 10   #ifndef BOOST_CAPY_DETAIL_RUN_HPP
11   #define BOOST_CAPY_DETAIL_RUN_HPP 11   #define BOOST_CAPY_DETAIL_RUN_HPP
12   12  
13   #include <boost/capy/detail/config.hpp> 13   #include <boost/capy/detail/config.hpp>
14   #include <boost/capy/detail/frame_memory_resource.hpp> 14   #include <boost/capy/detail/frame_memory_resource.hpp>
15   15  
16   #include <cstddef> 16   #include <cstddef>
17   #include <memory_resource> 17   #include <memory_resource>
18   18  
19   namespace boost { 19   namespace boost {
20   namespace capy { 20   namespace capy {
21   namespace detail { 21   namespace detail {
22   22  
23   /// Concept for standard Allocator types. 23   /// Concept for standard Allocator types.
24   template<class A> 24   template<class A>
25   concept Allocator = requires(A a, std::size_t n) { 25   concept Allocator = requires(A a, std::size_t n) {
26   typename A::value_type; 26   typename A::value_type;
27   { a.allocate(n) } -> std::same_as<typename A::value_type*>; 27   { a.allocate(n) } -> std::same_as<typename A::value_type*>;
28   }; 28   };
29   29  
30   /// Specialization for memory_resource* - stores pointer directly. 30   /// Specialization for memory_resource* - stores pointer directly.
31   template<> 31   template<>
32   class frame_memory_resource<std::pmr::memory_resource*> 32   class frame_memory_resource<std::pmr::memory_resource*>
33   { 33   {
34   std::pmr::memory_resource* mr_; 34   std::pmr::memory_resource* mr_;
35   35  
36   public: 36   public:
HITCBC 37   5 explicit frame_memory_resource(std::pmr::memory_resource* mr) noexcept 37   5 explicit frame_memory_resource(std::pmr::memory_resource* mr) noexcept
HITCBC 38   5 : mr_(mr) 38   5 : mr_(mr)
39   { 39   {
HITCBC 40   5 } 40   5 }
41   41  
HITCBC 42   5 std::pmr::memory_resource* get() noexcept { return mr_; } 42   5 std::pmr::memory_resource* get() noexcept { return mr_; }
43   }; 43   };
44   44  
45   /// Specialization for void - no allocator (empty). 45   /// Specialization for void - no allocator (empty).
46   template<> 46   template<>
47   class frame_memory_resource<void> 47   class frame_memory_resource<void>
48   { 48   {
49   public: 49   public:
50   frame_memory_resource() = default; 50   frame_memory_resource() = default;
51   51  
52   std::pmr::memory_resource* get() noexcept { return nullptr; } 52   std::pmr::memory_resource* get() noexcept { return nullptr; }
53   }; 53   };
54   54  
55   } // namespace detail 55   } // namespace detail
56   } // namespace capy 56   } // namespace capy
57   } // namespace boost 57   } // namespace boost
58   58  
59   #endif 59   #endif