fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
40 lines
949 B
C++
40 lines
949 B
C++
/*
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* Copyright (C) 2021-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <cstring>
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#include <cstddef>
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#include <type_traits>
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template <class T> concept Trivial = std::is_trivial_v<T>;
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template <class T> concept TriviallyCopyable = std::is_trivially_copyable_v<T>;
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// C++20 has std::bit_cast, which does the same thing,
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// (but better, because it supports constexpr through compiler magic)
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// but it hasn't made its way to our libstdc++ yet.
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template <Trivial To, TriviallyCopyable From>
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requires (sizeof(To) == sizeof(From))
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To bit_cast(const From& src) noexcept {
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To dst;
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std::memcpy(&dst, &src, sizeof(To));
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return dst;
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}
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template <Trivial To>
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To read_unaligned(const void* src) {
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To dst;
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std::memcpy(&dst, src, sizeof(To));
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return dst;
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}
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template <TriviallyCopyable From>
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void write_unaligned(void* dst, const From& src) {
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std::memcpy(dst, &src, sizeof(From));
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}
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