From 8c146685206bae1218e57f2b798fca137367473b Mon Sep 17 00:00:00 2001
From: Jeremie Deray <jeremie.deray@pal-robotics.com>
Date: Fri, 28 Oct 2016 17:07:03 +0200
Subject: [PATCH] add singleton.h
---
src/singleton.h | 65 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
create mode 100644 src/singleton.h
diff --git a/src/singleton.h b/src/singleton.h
new file mode 100644
index 000000000..c632b5bba
--- /dev/null
+++ b/src/singleton.h
@@ -0,0 +1,65 @@
+/**
+ * \file singleton.h
+ *
+ * Created on: Aug 31, 2016
+ * \author: Jeremie Deray
+ */
+
+#ifndef WOLF_SINGLETON_H_
+#define WOLF_SINGLETON_H_
+
+#include <memory>
+
+namespace wolf {
+namespace internal {
+
+/**
+ * \brief A thread-safer Singleton implementation with
+ * argument forwarding.
+ **/
+template <class T>
+class Singleton
+{
+ /**
+ * \brief Custom deleter to by-pass private destructor issue.
+ **/
+ struct Deleter;
+
+ using SingletonOPtr = std::unique_ptr<T, Deleter>;
+
+public:
+
+ template <typename... Args>
+ static T& get(Args&&... args)
+ {
+ static SingletonOPtr instance_(new T(args...));
+
+ return *instance_;
+ }
+
+ constexpr Singleton(const Singleton&) = delete;
+ //constexpr Singleton(const Singleton&&) = delete;
+
+ constexpr Singleton& operator=(const Singleton&) = delete;
+ //constexpr Singleton& operator=(const Singleton&&) = delete;
+
+protected:
+
+ Singleton() = default;
+
+ virtual ~Singleton() = default;
+};
+
+template <class T>
+struct Singleton<T>::Deleter
+{
+ void operator()( const T* const p )
+ {
+ delete p;
+ }
+};
+
+} // namespace internal
+} // namespace wolf
+
+#endif /* WOLF_SINGLETON_H_ */
--
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