Added custom allocator for subsonic responses

2024-03-19 09:08:43 +01:00
parent 5bfd31ff8a
commit 78384d5d3f
8 changed files with 324 additions and 26 deletions
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2024 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * LMS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include "TLSMonotonicMemoryResource.hpp"
+
+namespace lms::api::subsonic
+{
+    // Stateless allocator that uses a shared MemoryResource
+    template <typename MemoryResource, typename T>
+    class Allocator
+    {
+    public:
+        using value_type = T;
+        using pointer = T*;
+        using const_pointer = const T*;
+        using reference = T&;
+        using const_reference = const T&;
+        using size_type = std::size_t;
+        using difference_type = std::ptrdiff_t;
+
+        constexpr Allocator() noexcept = default;
+
+        template <typename U>
+        constexpr Allocator(const Allocator<MemoryResource, U>&) noexcept {}
+
+        template <typename V>
+        struct rebind
+        {
+            using other = Allocator<MemoryResource, V>;
+        };
+
+        [[nodiscard]] pointer allocate(size_type n)
+        {
+            return reinterpret_cast<pointer>(MemoryResource::getInstance().allocate(n * sizeof(T), alignof(T)));
+        }
+
+        // Deallocate memory pointed to by p
+        void deallocate(pointer p, std::size_t) noexcept
+        {
+            MemoryResource::getInstance().deallocate(reinterpret_cast<std::byte*>(p));
+        }
+    };
+
+    template<class MemoryResource, class T, class U>
+    bool operator==(const Allocator <MemoryResource, T>&, const Allocator <MemoryResource, U>&)
+    {
+        return true;
+    }
+
+    template<class MemoryResource, class T, class U>
+    bool operator!=(const Allocator <MemoryResource, T>&, const Allocator <MemoryResource, U>&)
+    {
+        return false;
+    }
+ 
+    template <typename T>
+    using ResponseAllocator = Allocator<TLSMonotonicMemoryResource, T>;
+}