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-rw-r--r--mfbt/Literals.h39
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diff --git a/mfbt/Literals.h b/mfbt/Literals.h
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+/* -*- 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 */