53 lines
1.3 KiB
C++
53 lines
1.3 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/common.h"
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#include "td/utils/port/FileFd.h"
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#include "td/utils/Slice.h"
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#include "td/utils/Status.h"
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namespace td {
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class MemoryMapping {
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public:
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struct Options {
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int64 offset{0};
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int64 size{-1};
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Options() {
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}
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Options &with_offset(int64 new_offset) {
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offset = new_offset;
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return *this;
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}
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Options &with_size(int64 new_size) {
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size = new_size;
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return *this;
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}
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};
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static Result<MemoryMapping> create_anonymous(const Options &options = {});
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static Result<MemoryMapping> create_from_file(const FileFd &file, const Options &options = {});
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Slice as_slice() const;
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MutableSlice as_mutable_slice(); // returns empty slice if memory is read-only
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MemoryMapping(const MemoryMapping &other) = delete;
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const MemoryMapping &operator=(const MemoryMapping &other) = delete;
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MemoryMapping(MemoryMapping &&other);
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MemoryMapping &operator=(MemoryMapping &&other);
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~MemoryMapping();
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private:
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class Impl;
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unique_ptr<Impl> impl_;
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explicit MemoryMapping(unique_ptr<Impl> impl);
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};
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} // namespace td
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