libcruft-util/alloc/raw/affix.hpp

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/*
* Licensed 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.
*
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
*/
#ifndef CRUFT_UTIL_ALLOC_RAW_AFFIX_HPP
#define CRUFT_UTIL_ALLOC_RAW_AFFIX_HPP
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#include "../../view.hpp"
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#include <cstddef>
namespace util::alloc::raw {
/// a raw memory allocator which initialises an instance of PrefixT
/// immediately before each allocation and, if specified, an instance
/// of SuffixT after the allocation.
///
/// uses an instance of ParentT to actually perform the bulk allocations.
///
/// useful for sentinels, reference counts, etc.
template <class ParentT, class PrefixT, class SuffixT>
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class affix {
util::view<std::byte*> allocate (size_t bytes);
util::view<std::byte*> allocate (size_t bytes, size_t align);
void deallocate (util::view<std::byte*> ptr) { return deallocate (ptr.data (), ptr.size ()); }
void deallocate (util::view<std::byte*> ptr, size_t alignment) { return deallocate (ptr.data (), ptr.size (), alignment); }
void deallocate (void *ptr, size_t bytes);
void deallocate (void *ptr, size_t bytes, size_t align);
std::byte* begin (void);
const std::byte* begin (void) const;
std::byte* end (void);
const std::byte* end (void) const;
size_t offset (const void*) const;
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};
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}
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#endif