Squashed 'src/ipc/libmultiprocess/' content from commit 35944ffd23fa

git-subtree-dir: src/ipc/libmultiprocess
git-subtree-split: 35944ffd23fa26652b82210351d50e896ce16c8f

include/mp/type-void.h

@@ -0,0 +1,23 @@
+// Copyright (c) 2025 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef MP_PROXY_TYPE_VOID_H
+#define MP_PROXY_TYPE_VOID_H
+
+#include <mp/util.h>
+
+namespace mp {
+template <typename Value>
+::capnp::Void BuildPrimitive(InvokeContext& invoke_context, Value&&, TypeList<::capnp::Void>)
+{
+    return {};
+}
+
+template <typename LocalType, typename Output>
+void CustomBuildField(TypeList<LocalType>, Priority<1>, InvokeContext& invoke_context, ::capnp::Void, Output&& output)
+{
+}
+} // namespace mp
+
+#endif // MP_PROXY_TYPE_VOID_H