libcruft-util/alloc/raw/linear.hpp

70 lines
2.0 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 CRUFT_UTIL_ALLOC_RAW_LINEAR_HPP
#define CRUFT_UTIL_ALLOC_RAW_LINEAR_HPP
#include <cstddef>
#include <iterator>
namespace util::alloc::raw {
// 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);
template <typename T>
linear (T &&view):
linear (std::begin (view), std::end (view))
{ ; }
void* allocate (size_t bytes);
void* allocate (size_t bytes, size_t alignment);
void deallocate (void *ptr, size_t bytes);
void deallocate (void *ptr, size_t bytes, size_t alignment);
void* data (void);
void* begin (void);
void* end (void);
void* cursor (void);
const void* data (void) const;
const void* begin (void) const;
const void* end (void) const;
const void* cursor (void) const;
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;
};
}
#endif