os: implement Tick api, make build with -Werror

libraries/libstratosphere/include/stratosphere/os/os_tick.hpp

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include "os_common_types.hpp"
+
+namespace ams::os {
+
+    class Tick;
+
+    /* Tick API. */
+    Tick GetSystemTick();
+    s64 GetSystemTickFrequency();
+    TimeSpan ConvertToTimeSpan(Tick tick);
+    Tick ConvertToTick(TimeSpan ts);
+
+    class Tick {
+        private:
+            s64 tick;
+        public:
+            constexpr explicit Tick(s64 t = 0) : tick(t) { /* ... */ }
+            Tick(TimeSpan ts) : tick(ConvertToTick(ts).GetInt64Value()) { /* ... */ }
+        public:
+            constexpr s64 GetInt64Value() const { return this->tick; }
+            TimeSpan ToTimeSpan() const { return ConvertToTimeSpan(*this); }
+
+            /* Tick arithmetic. */
+            constexpr Tick &operator+=(Tick rhs) { this->tick += rhs.tick; return *this; }
+            constexpr Tick &operator-=(Tick rhs) { this->tick -= rhs.tick; return *this; }
+            constexpr Tick operator+(Tick rhs) const { Tick r(*this); return r += rhs; }
+            constexpr Tick operator-(Tick rhs) const { Tick r(*this); return r -= rhs; }
+
+            constexpr bool operator==(const Tick &rhs) const {
+                return this->tick == rhs.tick;
+            }
+
+            constexpr bool operator!=(const Tick &rhs) const {
+                return !(*this == rhs);
+            }
+
+            constexpr bool operator<(const Tick &rhs) const {
+                return this->tick < rhs.tick;
+            }
+
+            constexpr bool operator>=(const Tick &rhs) const {
+                return !(*this < rhs);
+            }
+
+            constexpr bool operator>(const Tick &rhs) const {
+                return this->tick > rhs.tick;
+            }
+
+            constexpr bool operator<=(const Tick &rhs) const {
+                return !(*this > rhs);
+            }
+    };
+
+}