From 28c7884d0186ad80db7b9ffa12dd5e52bcb6c52b Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sun, 23 Jun 2019 00:36:46 +0800
Subject: ...

---
 include/cru/common/self_resolvable.hpp | 45 ++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 include/cru/common/self_resolvable.hpp

(limited to 'include/cru/common')

diff --git a/include/cru/common/self_resolvable.hpp b/include/cru/common/self_resolvable.hpp
new file mode 100644
index 00000000..edeb1434
--- /dev/null
+++ b/include/cru/common/self_resolvable.hpp
@@ -0,0 +1,45 @@
+#pragma once
+#include "pre_config.hpp"
+
+#include <memory>
+
+namespace cru {
+template <typename T>
+class SelfResovable;
+
+template <typename T>
+class ObjectResovler {
+  friend SelfResovable<T>;
+
+ private:
+  ObjectResovler(const std::shared_ptr<T*>& resolver) : resolver_(resolver) {}
+
+ public:
+  ObjectResovler(const ObjectResovler&) = default;
+  ObjectResovler& operator=(const ObjectResovler&) = default;
+  ObjectResovler(ObjectResovler&&) = default;
+  ObjectResovler& operator=(ObjectResovler&&) = default;
+  ~ObjectResovler() = default;
+
+  T* Resolve() const { return *resolver_; }
+
+ private:
+  std::shared_ptr<T*> resolver_;
+};
+
+template <typename T>
+class SelfResovable {
+ public:
+  SelfResovable() : resolver_(new T*(static_cast<T*>(this))) {}
+  SelfResovable(const SelfResovable&) = delete;
+  SelfResovable& operator=(const SelfResovable&) = delete;
+  SelfResovable(SelfResovable&&) = delete;
+  SelfResovable& operator=(SelfResovable&&) = delete;
+  virtual ~SelfResovable() { (*resolver_) = nullptr; }
+
+  ObjectResovler<T> CreateResolver() { return ObjectResovler<T>(resolver_); }
+
+ private:
+  std::shared_ptr<T*> resolver_;
+};
+}  // namespace cru
-- 
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