添加creeper-qt最新依赖

creeper-qt/utility/wrapper/singleton.hh

@@ -0,0 +1,23 @@
+#pragma once
+#include <memory>
+
+namespace creeper::util {
+
+template <typename T> class Singleton {
+public:
+    static T& instance();
+
+    Singleton(const Singleton&)            = delete;
+    Singleton& operator=(const Singleton&) = delete;
+
+protected:
+    struct token { };
+    Singleton() = default;
+};
+
+template <typename T> inline T& Singleton<T>::instance() {
+    static const std::unique_ptr<T> instance { new T { token {} } };
+    return *instance;
+}
+
+}