56 lines
1.5 KiB
C++
56 lines
1.5 KiB
C++
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//
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// immer: immutable data structures for C++
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// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
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//
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// This software is distributed under the Boost Software License, Version 1.0.
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// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
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//
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#pragma once
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#include <immer/heap/unsafe_free_list_heap.hpp>
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namespace immer {
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namespace detail {
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template <typename Heap>
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struct thread_local_free_list_storage
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{
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struct head_t
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{
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free_list_node* data;
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std::size_t count;
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~head_t() { Heap::clear(); }
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};
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static head_t& head()
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{
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thread_local static head_t head_{nullptr, 0};
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return head_;
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}
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};
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} // namespace detail
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/*!
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* Adaptor that does not release the memory to the parent heap but
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* instead it keeps the memory in a `thread_local` global free
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* list. Must be preceded by a `with_data<free_list_node, ...>` heap
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* adaptor. When the current thread finishes, the memory is returned
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* to the parent heap.
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*
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* @tparam Size Maximum size of the objects to be allocated.
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* @tparam Limit Maximum number of elements to keep in the free list.
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* @tparam Base Type of the parent heap.
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*/
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template <std::size_t Size, std::size_t Limit, typename Base>
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struct thread_local_free_list_heap
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: detail::unsafe_free_list_heap_impl<detail::thread_local_free_list_storage,
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Size,
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Limit,
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Base>
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{};
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} // namespace immer
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