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git-subtree-dir: src/ipc/libmultiprocess git-subtree-split: 35944ffd23fa26652b82210351d50e896ce16c8f
48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
// Copyright (c) 2025 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_OPTIONAL_H
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#define MP_PROXY_TYPE_OPTIONAL_H
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#include <mp/util.h>
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namespace mp {
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template <typename LocalType, typename Value, typename Output>
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void CustomBuildField(TypeList<std::optional<LocalType>>,
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Priority<1>,
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InvokeContext& invoke_context,
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Value&& value,
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Output&& output)
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{
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if (value) {
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output.setHas();
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// FIXME: should std::move value if destvalue is rref?
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BuildField(TypeList<LocalType>(), invoke_context, output, *value);
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}
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}
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template <typename LocalType, typename Input, typename ReadDest>
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decltype(auto) CustomReadField(TypeList<std::optional<LocalType>>,
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Priority<1>,
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InvokeContext& invoke_context,
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Input&& input,
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ReadDest&& read_dest)
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{
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return read_dest.update([&](auto& value) {
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if (!input.has()) {
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value.reset();
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} else if (value) {
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ReadField(TypeList<LocalType>(), invoke_context, input, ReadDestUpdate(*value));
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} else {
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ReadField(TypeList<LocalType>(), invoke_context, input,
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ReadDestEmplace(TypeList<LocalType>(), [&](auto&&... args) -> auto& {
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value.emplace(std::forward<decltype(args)>(args)...);
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return *value;
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}));
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}
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});
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}
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} // namespace mp
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#endif // MP_PROXY_TYPE_OPTIONAL_H
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