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Diffstat (limited to 'trunk/qpid/cpp/include/qpid/InlineAllocator.h')
-rw-r--r-- | trunk/qpid/cpp/include/qpid/InlineAllocator.h | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/trunk/qpid/cpp/include/qpid/InlineAllocator.h b/trunk/qpid/cpp/include/qpid/InlineAllocator.h deleted file mode 100644 index 2502545dcb..0000000000 --- a/trunk/qpid/cpp/include/qpid/InlineAllocator.h +++ /dev/null @@ -1,101 +0,0 @@ -#ifndef QPID_INLINEALLOCATOR_H -#define QPID_INLINEALLOCATOR_H - -/* - * - * 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. - * - */ - -#include <memory> -#include <assert.h> -#include <boost/type_traits/type_with_alignment.hpp> -#include <boost/type_traits/alignment_of.hpp> - -namespace qpid { - -template <typename RequestedType, typename InlineType, typename BaseAllocator, size_t Max> -struct InlineRebind; - - -/** - * An allocator that has inline storage for up to Max objects - * of type BaseAllocator::value_type. - */ -template <class BaseAllocator, size_t Max> -class InlineAllocator : public BaseAllocator { - public: - typedef typename BaseAllocator::pointer pointer; - typedef typename BaseAllocator::size_type size_type; - typedef typename BaseAllocator::value_type value_type; - - InlineAllocator() : allocated(false) {} - InlineAllocator(const InlineAllocator& x) : BaseAllocator(x), allocated(false) {} - - pointer allocate(size_type n) { - if (n <= Max && !allocated) { - allocated=true; - return reinterpret_cast<value_type*>(address()); - } - else - return BaseAllocator::allocate(n, 0); - } - - void deallocate(pointer p, size_type n) { - if (p == address()) { - assert(allocated); - allocated=false; - } - else - BaseAllocator::deallocate(p, n); - } - - template<typename T1> - struct rebind { - typedef typename InlineRebind<T1, value_type, BaseAllocator, Max>::other other; - }; - - private: - // POD object with alignment and size to hold Max value_types. - static const size_t ALIGNMENT=boost::alignment_of<value_type>::value; - typedef typename boost::type_with_alignment<ALIGNMENT>::type Aligner; - union Store { - Aligner aligner_; - char sizer_[sizeof(value_type)*Max]; - } store; - value_type* address() { return reinterpret_cast<value_type*>(&store); } - bool allocated; -}; - - -// Rebind: if RequestedType == InlineType, use the InlineAllocator, -// otherwise, use the BaseAllocator without any inlining. - -template <typename RequestedType, typename InlineType, typename BaseAllocator, size_t Max> -struct InlineRebind { - typedef typename BaseAllocator::template rebind<RequestedType>::other other; -}; - -template <typename T, typename BaseAllocator, size_t Max> -struct InlineRebind<T, T, BaseAllocator, Max> { - typedef typename qpid::InlineAllocator<BaseAllocator, Max> other; -}; - -} // namespace qpid - -#endif /*!QPID_INLINEALLOCATOR_H*/ |