summaryrefslogtreecommitdiffstats
path: root/ipc/glue/IPDLStructMember.h
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /ipc/glue/IPDLStructMember.h
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'ipc/glue/IPDLStructMember.h')
-rw-r--r--ipc/glue/IPDLStructMember.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/ipc/glue/IPDLStructMember.h b/ipc/glue/IPDLStructMember.h
new file mode 100644
index 0000000000..d2e3636054
--- /dev/null
+++ b/ipc/glue/IPDLStructMember.h
@@ -0,0 +1,37 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_ipc_IPDLStructMember_h
+#define mozilla_ipc_IPDLStructMember_h
+
+#include <type_traits>
+#include <utility>
+#include "mozilla/Attributes.h"
+
+namespace mozilla::ipc {
+
+// For types which are trivially default constructible, like `int`, force the
+// value constructor by wrapping the type in this struct. This is an
+// implementation detail which will be hidden by the generated IPDL compiler
+// code.
+template <typename T>
+struct IPDLStructMemberWrapper {
+ template <typename... Args>
+ MOZ_IMPLICIT IPDLStructMemberWrapper(Args&&... aArgs)
+ : mVal(std::forward<Args>(aArgs)...) {}
+ MOZ_IMPLICIT operator T&() { return mVal; }
+ MOZ_IMPLICIT operator const T&() const { return mVal; }
+ T mVal{};
+};
+
+template <typename T>
+using IPDLStructMember =
+ std::conditional_t<std::is_trivially_default_constructible_v<T>,
+ IPDLStructMemberWrapper<T>, T>;
+
+} // namespace mozilla::ipc
+
+#endif // mozilla_ipc_IPDLStructMember_h