Danny Robson
c2265b9ed2
sometimes we need to ensure memory allocation has a particular alignment in an _offset_ buffer (which we have no control over, eg renderdoc's OpenGL buffers). this applies an offset to various operations that make the aligned::direct allocator correctly align allocations for buffers that aren't themselves aligned.
68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2015 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef CRUFT_UTIL_ALLOC_RAW_STACK_HPP
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#define CRUFT_UTIL_ALLOC_RAW_STACK_HPP
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#include "../../view.hpp"
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#include <cstddef>
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namespace util::alloc::raw {
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// allocate memory from a buffer in a stacklike manner. deallocation that
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// is not correctly ordered has undefined (read 'bad') results.
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class stack {
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public:
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stack (const stack&) = delete;
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stack (stack&&) = delete;
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stack& operator= (const stack&) = delete;
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stack& operator= (stack&&) = delete;
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stack (util::view<std::byte*> _data);
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void *allocate (size_t bytes, size_t alignment);
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void *allocate (size_t bytes);
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void deallocate (void *ptr, size_t bytes);
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void deallocate (void *ptr, size_t bytes, size_t alignment);
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util::view<std::byte*> data (void);
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util::view<const std::byte*> data (void) const;
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std::byte* begin (void);
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const std::byte* begin (void) const;
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std::byte* end (void);
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const std::byte* end (void) const;
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size_t offset (const void*) const;
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void reset (void);
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size_t capacity (void) const;
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size_t used (void) const;
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size_t remain (void) const;
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private:
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std::byte *const m_begin;
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std::byte *const m_end;
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std::byte *m_cursor;
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};
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}
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#endif
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