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6d5f753921
e8de5c7b68 Merge bitcoin-core/libmultiprocess#305: refactor: memcpy to std::ranges::copy to work around ubsan warn 9307e68e5a Merge bitcoin-core/libmultiprocess#306: doc: Bump version 12 > 13 fac7b9b7f6 refactor: memcpy to std::ranges::copy to work around ubsan warn 1bd7025609 Merge bitcoin-core/libmultiprocess#297: test: add map serialization round-trip coverage 438fdd243d doc: Bump version 12 > 13 463d073cb8 test: rename vBool to vector_bool 85df233845 test: add mapStringInt to foo.capnp to cover map serialization and deserialization git-subtree-dir: src/ipc/libmultiprocess git-subtree-split: e8de5c7b68e0ae21c94ae92aa22e5c3b213f9c12
51 lines
1.9 KiB
C++
51 lines
1.9 KiB
C++
// Copyright (c) The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef MP_PROXY_TYPE_DATA_H
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#define MP_PROXY_TYPE_DATA_H
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#include <mp/util.h>
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#include <concepts>
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#include <span>
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#include <ranges>
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namespace mp {
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template <typename T, typename U>
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concept IsSpanOf =
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std::convertible_to<T, std::span<const U>> &&
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std::constructible_from<T, const U*, const U*>;
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template <typename T>
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concept IsByteSpan =
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IsSpanOf<T, std::byte> ||
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IsSpanOf<T, char> ||
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IsSpanOf<T, unsigned char> ||
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IsSpanOf<T, signed char>;
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//! Generic ::capnp::Data field builder for any C++ type that can be converted
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//! to a span of bytes, like std::vector<char> or std::array<uint8_t>, or custom
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//! blob types like uint256 or PKHash with data() and size() methods pointing to
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//! bytes.
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template <typename LocalType, typename Value, typename Output>
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void CustomBuildField(TypeList<LocalType>, Priority<2>, InvokeContext& invoke_context, Value&& value, Output&& output)
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requires (std::is_same_v<decltype(output.get()), ::capnp::Data::Builder> && IsByteSpan<LocalType>)
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{
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auto data = std::span{value};
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auto result = output.init(data.size());
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std::ranges::copy(data, result.begin());
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}
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template <typename LocalType, typename Input, typename ReadDest>
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decltype(auto) CustomReadField(TypeList<LocalType>, Priority<2>, InvokeContext& invoke_context, Input&& input, ReadDest&& read_dest)
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requires (std::is_same_v<decltype(input.get()), ::capnp::Data::Reader> && IsByteSpan<LocalType>)
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{
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using ByteType = decltype(std::span{std::declval<LocalType>().begin(), std::declval<LocalType>().end()})::element_type;
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const kj::byte *begin{input.get().begin()}, *end{input.get().end()};
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return read_dest.construct(reinterpret_cast<const ByteType*>(begin), reinterpret_cast<const ByteType*>(end));
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}
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} // namespace mp
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#endif // MP_PROXY_TYPE_DATA_H
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