f3eade2f62
Drop the AGPL license in favor of a source-available license. See the blog post [1] for details. [1] https://www.scylladb.com/2024/12/18/why-were-moving-to-a-source-available-license/
41 lines
1.4 KiB
C++
41 lines
1.4 KiB
C++
/*
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* Copyright (C) 2024-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#pragma once
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#include <concepts>
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#include <memory>
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// A contiguous buffer of char objects which can be trimmed and
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// supports zero-copy sharing of its underlying memory.
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template<typename T>
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concept ContiguousSharedBuffer = std::movable<T>
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&& std::default_initializable<T>
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&& requires(T& obj, size_t pos, size_t len) {
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// Creates a new buffer that shares the memory of the original buffer.
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// The lifetime of the new buffer is independent of the original buffer.
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{ obj.share() } -> std::same_as<T>;
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// Like share() but the new buffer represents a sub-range of the original buffer.
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{ obj.share(pos, len) } -> std::same_as<T>;
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// Trims the suffix of a buffer so that 'len' is the index of the first removed byte.
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{ obj.trim(len) } -> std::same_as<void>;
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// Trims the prefix of the buffer so that `pos` is the index of the first byte after the trim.
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{ obj.trim_front(pos) } -> std::same_as<void>;
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{ obj.begin() } -> std::same_as<const char*>;
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{ obj.get() } -> std::same_as<const char*>;
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{ obj.get_write() } -> std::same_as<char*>;
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{ obj.end() } -> std::same_as<const char*>;
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{ obj.size() } -> std::same_as<size_t>;
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{ obj.empty() } -> std::same_as<bool>;
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};
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