75 lines
2.2 KiB
Diff
75 lines
2.2 KiB
Diff
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From 311de0b6358ba2b8eae20dcc5baf29472a273fc6 Mon Sep 17 00:00:00 2001
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From: Simon Giesecke <sgiesecke@mozilla.com>
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Date: Tue, 3 Dec 2019 15:25:49 +0000
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Subject: [PATCH] Bug 1598164 - Added FlippedOnce class template to help
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reducing statefulness of boolean flags.
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r=dom-workers-and-storage-reviewers,ytausky
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Differential Revision: https://phabricator.services.mozilla.com/D55080
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--HG--
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extra : moz-landing-system : lando
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---
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dom/indexedDB/FlippedOnce.h | 39 +++++++++++++++++++++++++++++++++++++
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dom/indexedDB/moz.build | 1 +
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2 files changed, 40 insertions(+)
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create mode 100644 dom/indexedDB/FlippedOnce.h
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diff --git a/dom/indexedDB/FlippedOnce.h b/dom/indexedDB/FlippedOnce.h
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new file mode 100644
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index 0000000000000..94cd8570a4b6e
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--- /dev/null
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+++ b/dom/indexedDB/FlippedOnce.h
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@@ -0,0 +1,39 @@
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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+/* This Source Code Form is subject to the terms of the Mozilla Public
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+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
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+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
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+
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+#ifndef mozilla_dom_indexeddb_flippedonce_h__
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+#define mozilla_dom_indexeddb_flippedonce_h__
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+
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+#include "mozilla/Assertions.h"
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+#include "mozilla/Attributes.h"
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+
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+namespace mozilla {
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+
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+// A state-restricted bool, which can only be flipped once. It isn't required to
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+// be flipped during its lifetime.
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+template <bool Initial>
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+class FlippedOnce {
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+ public:
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+ FlippedOnce(const FlippedOnce&) = delete;
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+ FlippedOnce& operator=(const FlippedOnce&) = delete;
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+
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+ FlippedOnce() = default;
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+
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+ MOZ_IMPLICIT operator bool() const { return mValue; };
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+
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+ void Flip() {
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+ MOZ_ASSERT(mValue == Initial);
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+ EnsureFlipped();
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+ }
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+
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+ void EnsureFlipped() { mValue = !Initial; }
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+
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+ private:
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+ bool mValue = Initial;
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+};
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+} // namespace mozilla
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+
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+#endif
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diff --git a/dom/indexedDB/moz.build b/dom/indexedDB/moz.build
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index 4302528e6847b..5237528963127 100644
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--- a/dom/indexedDB/moz.build
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+++ b/dom/indexedDB/moz.build
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@@ -24,6 +24,7 @@ XPCSHELL_TESTS_MANIFESTS += [
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]
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EXPORTS.mozilla.dom += [
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+ 'FlippedOnce.h',
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'IDBCursor.h',
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'IDBDatabase.h',
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'IDBEvents.h',
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