Timer: add

src/core/Timer.cpp

@@ -0,0 +1,25 @@
+#include "Timer.hpp"
+
+CTimer::CTimer(std::chrono::system_clock::duration timeout, std::function<void(std::shared_ptr<CTimer> self, void* data)> cb_, void* data_) : cb(cb_), data(data_) {
+    expires = std::chrono::system_clock::now() + timeout;
+}
+
+bool CTimer::passed() {
+    return std::chrono::system_clock::now() > expires;
+}
+
+void CTimer::cancel() {
+    wasCancelled = true;
+}
+
+bool CTimer::cancelled() {
+    return wasCancelled;
+}
+
+void CTimer::call(std::shared_ptr<CTimer> self) {
+    cb(self, data);
+}
+
+float CTimer::leftMs() {
+    return std::chrono::duration_cast<std::chrono::milliseconds>(expires - std::chrono::system_clock::now()).count();
+}

src/core/Timer.hpp

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <chrono>
+#include <functional>
+
+class CTimer {
+  public:
+    CTimer(std::chrono::system_clock::duration timeout, std::function<void(std::shared_ptr<CTimer> self, void* data)> cb_, void* data_);
+
+    void  cancel();
+    bool  passed();
+
+    float leftMs();
+
+    bool  cancelled();
+    void  call(std::shared_ptr<CTimer> self);
+
+  private:
+    std::function<void(std::shared_ptr<CTimer> self, void* data)> cb;
+    void*                                                         data = nullptr;
+    std::chrono::system_clock::time_point                         expires;
+    bool                                                          wasCancelled = false;
+};