libcruft-util/alloc/raw/null.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_NULL_HPP
#define CRUFT_UTIL_ALLOC_RAW_NULL_HPP
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#include "../../view.hpp"
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#include <cstddef>
namespace util::alloc::raw {
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// allocator that always fails, throwing bad_alloc. deallocate will
// succeed with nullptr as with delete, but is undefined with other values
// (it is likely to at least assert).
class null {
public:
null () = default;
null (const null&) = delete;
null& operator= (const null&) = delete;
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);
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util::view<std::byte*> data (void);
util::view<const std::byte*> data (void) const;
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;
void reset (void);
size_t capacity (void) const;
size_t used (void) const;
size_t remain (void) const;
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};
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}
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#endif