libcruft-util/alloc/linear.hpp

53 lines
1.6 KiB
C++

/*
* 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 __UTIL_ALLOC_LINEAR_HPP
#define __UTIL_ALLOC_LINEAR_HPP
#include <cstddef>
namespace util::alloc {
// allocate progressively across a buffer without concern for deallocation.
// deallocation is a noop; the only way to free allocations is via reset.
class linear {
public:
linear (const linear&) = delete;
linear (linear&&) = delete;
linear& operator= (const linear&) = delete;
linear& operator= (linear&&) = delete;
linear (void *begin, void *end);
void* allocate (size_t bytes, size_t alignment = alignof (std::max_align_t));
void deallocate (void *ptr, size_t bytes, size_t alignment = alignof (std::max_align_t));
void* base (void);
size_t offset (const void*) const;
void reset (void);
size_t capacity (void) const;
size_t used (void) const;
size_t remain (void) const;
protected:
char *m_begin, *m_end, *m_cursor;
};
}
#include "./linear.hpp"
#endif