| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| #ifndef LIB_UTILALLOCATOR_H_ |
| #define LIB_UTILALLOCATOR_H_ |
| |
| #include <boost/aligned_storage.hpp> |
| |
| class HandlerAllocator : private boost::noncopyable { |
| public: |
| HandlerAllocator() : inUse_(false) {} |
| |
| void* allocate(std::size_t size) { |
| if (!inUse_ && size < storage_.size) { |
| inUse_ = true; |
| return storage_.address(); |
| } else { |
| return ::operator new(size); |
| } |
| } |
| |
| void deallocate(void* pointer) { |
| if (pointer == storage_.address()) { |
| inUse_ = false; |
| } else { |
| ::operator delete(pointer); |
| } |
| } |
| |
| private: |
| // Storage space used for handler-based custom memory allocation. |
| boost::aligned_storage<1024> storage_; |
| bool inUse_; |
| }; |
| |
| template <typename Handler> |
| class AllocHandler { |
| public: |
| AllocHandler(HandlerAllocator& a, Handler h) : allocator_(a), handler_(h) {} |
| |
| template <typename Arg1> |
| void operator()(Arg1 arg1) { |
| handler_(arg1); |
| } |
| |
| template <typename Arg1, typename Arg2> |
| void operator()(Arg1 arg1, Arg2 arg2) { |
| handler_(arg1, arg2); |
| } |
| |
| friend void* asio_handler_allocate(std::size_t size, AllocHandler<Handler>* thisHandler) { |
| return thisHandler->allocator_.allocate(size); |
| } |
| |
| friend void asio_handler_deallocate(void* ptr, std::size_t, AllocHandler<Handler>* thisHandler) { |
| thisHandler->allocator_.deallocate(ptr); |
| } |
| |
| private: |
| HandlerAllocator& allocator_; |
| Handler handler_; |
| }; |
| |
| #endif /* LIB_UTILALLOCATOR_H_ */ |