1 files changed, 39 insertions, 0 deletions
diff --git a/mfbt/Literals.h b/mfbt/Literals.h
new file mode 100644
index 0000000000..d1d403afae
--- /dev/null
+++ b/mfbt/Literals.h
@@ -0,0 +1,39 @@
+/* -*- 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/. */
+
+/* Helpers for units on integer literals. */
+
+#ifndef mozilla_Literals_h
+#define mozilla_Literals_h
+
+#include <cstddef>
+
+// User-defined literals to make constants more legible.  Use them by
+// appending them to literals such as:
+//
+// size_t page_size = 4_KiB;
+//
+constexpr size_t operator"" _KiB(unsigned long long int aNum) {
+  return size_t(aNum) * 1024;
+}
+
+constexpr size_t operator"" _KiB(long double aNum) {
+  return size_t(aNum * 1024);
+}
+
+constexpr size_t operator"" _MiB(unsigned long long int aNum) {
+  return size_t(aNum) * 1024_KiB;
+}
+
+constexpr size_t operator"" _MiB(long double aNum) {
+  return size_t(aNum * 1024_KiB);
+}
+
+constexpr double operator""_percent(long double aPercent) {
+  return double(aPercent) / 100;
+}
+
+#endif /* ! mozilla_Literals_h */