Add SysReg::NewCallback for future use

include/sysreg.h

@@ -0,0 +1,19 @@
+#include <functional>
+#include <memory>
+#include <string>
+#include <vector>
+namespace VoidFrame {
+class SysReg {
+public:
+  const std::function<void(void)> *
+  RegisterCallback(const std::string &&name,
+                   std::function<void(void)> &callback);
+  const std::function<void(void)> *GetCallback(std::string &&name);
+  void DeleteCallback(std::string &&name);
+  const std::function<void(void)> *NewCallback(const std::string &&name);
+
+private:
+  std::unordered_map<std::string, std::unique_ptr<std::function<void(void)>>>
+      callbacks;
+};
+} // namespace VoidFrame

src/sysreg.cpp

@@ -0,0 +1,26 @@
+#include "../include/sysreg.h"
+
+using namespace VoidFrame;
+
+const std::function<void(void)> *
+SysReg::RegisterCallback(const std::string &&name,
+                         std::function<void(void)> &callback) {
+  callbacks[name] =
+      std::make_unique<std::function<void(void)>>(std::move(callback));
+
+  return callbacks[name].get();
+}
+
+const std::function<void(void)> *SysReg::GetCallback(std::string &&name) {
+  return callbacks[name].get();
+}
+
+void SysReg::DeleteCallback(std::string &&name) { callbacks.erase(name); }
+
+const std::function<void(void)> *SysReg::NewCallback(const std::string &&name) {
+  if (callbacks.count(name) == 0) {
+    callbacks[name] = std::make_unique<std::function<void(void)>>([]() {});
+  }
+
+  return callbacks[name].get();
+}