From 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 03:47:29 +0200 Subject: Adding upstream version 115.8.0esr. Signed-off-by: Daniel Baumann --- dom/indexedDB/FlippedOnce.h | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 dom/indexedDB/FlippedOnce.h (limited to 'dom/indexedDB/FlippedOnce.h') diff --git a/dom/indexedDB/FlippedOnce.h b/dom/indexedDB/FlippedOnce.h new file mode 100644 index 0000000000..9ef2383a7c --- /dev/null +++ b/dom/indexedDB/FlippedOnce.h @@ -0,0 +1,41 @@ +/* -*- 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_dom_indexeddb_flippedonce_h__ +#define mozilla_dom_indexeddb_flippedonce_h__ + +#include "mozilla/Assertions.h" +#include "mozilla/Attributes.h" + +namespace mozilla { + +// A state-restricted bool, which can only be flipped once. It isn't required to +// be flipped during its lifetime. +template +class FlippedOnce { + public: + FlippedOnce(const FlippedOnce&) = delete; + FlippedOnce& operator=(const FlippedOnce&) = delete; + FlippedOnce(FlippedOnce&&) = default; + FlippedOnce& operator=(FlippedOnce&&) = default; + + constexpr FlippedOnce() = default; + + MOZ_IMPLICIT constexpr operator bool() const { return mValue; }; + + constexpr void Flip() { + MOZ_ASSERT(mValue == Initial); + EnsureFlipped(); + } + + constexpr void EnsureFlipped() { mValue = !Initial; } + + private: + bool mValue = Initial; +}; +} // namespace mozilla + +#endif -- cgit v1.2.3