1 files changed, 93 insertions, 0 deletions
diff --git a/modules/libpref/StaticPrefsBase.h b/modules/libpref/StaticPrefsBase.h
new file mode 100644
index 0000000000..597a5beda2
--- /dev/null
+++ b/modules/libpref/StaticPrefsBase.h
@@ -0,0 +1,93 @@
+/* -*- 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_StaticPrefsBase_h
+#define mozilla_StaticPrefsBase_h
+
+#include <type_traits>
+
+#include "mozilla/Atomics.h"
+#include "mozilla/DataMutex.h"
+#include "nsString.h"
+
+namespace mozilla {
+
+class SharedPrefMapBuilder;
+
+// These typedefs are for use within init/StaticPrefList*.h.
+
+typedef const char* String;
+
+using DataMutexString = StaticDataMutex<nsCString>;
+
+template <typename T>
+struct IsString : std::false_type {};
+
+template <>
+struct IsString<String> : std::true_type {};
+
+template <>
+struct IsString<DataMutexString> : std::true_type {};
+
+typedef Atomic<bool, Relaxed> RelaxedAtomicBool;
+typedef Atomic<bool, ReleaseAcquire> ReleaseAcquireAtomicBool;
+typedef Atomic<bool, SequentiallyConsistent> SequentiallyConsistentAtomicBool;
+
+typedef Atomic<int32_t, Relaxed> RelaxedAtomicInt32;
+typedef Atomic<int32_t, ReleaseAcquire> ReleaseAcquireAtomicInt32;
+typedef Atomic<int32_t, SequentiallyConsistent>
+    SequentiallyConsistentAtomicInt32;
+
+typedef Atomic<uint32_t, Relaxed> RelaxedAtomicUint32;
+typedef Atomic<uint32_t, ReleaseAcquire> ReleaseAcquireAtomicUint32;
+typedef Atomic<uint32_t, SequentiallyConsistent>
+    SequentiallyConsistentAtomicUint32;
+
+// XXX: Atomic<float> currently doesn't work (see bug 1552086). Once it's
+// supported we will be able to use Atomic<float> here.
+typedef std::atomic<float> AtomicFloat;
+
+template <typename T>
+struct StripAtomicImpl {
+  typedef T Type;
+};
+
+template <typename T, MemoryOrdering Order>
+struct StripAtomicImpl<Atomic<T, Order>> {
+  typedef T Type;
+};
+
+template <typename T>
+struct StripAtomicImpl<std::atomic<T>> {
+  typedef T Type;
+};
+
+template <>
+struct StripAtomicImpl<DataMutexString> {
+  typedef nsCString Type;
+};
+
+template <typename T>
+using StripAtomic = typename StripAtomicImpl<T>::Type;
+
+template <typename T>
+struct IsAtomic : std::false_type {};
+
+template <typename T, MemoryOrdering Order>
+struct IsAtomic<Atomic<T, Order>> : std::true_type {};
+
+template <typename T>
+struct IsAtomic<std::atomic<T>> : std::true_type {};
+
+namespace StaticPrefs {
+
+void MaybeInitOncePrefs();
+
+}  // namespace StaticPrefs
+
+}  // namespace mozilla
+
+#endif  // mozilla_StaticPrefsBase_h