From 145cfd5b82d76e0c937eceda707aa22427899943 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Wed, 2 Dec 2020 19:19:22 +0800
Subject: ...

---
 include/cru/common/SelfResolvable.hpp | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

(limited to 'include/cru/common/SelfResolvable.hpp')

diff --git a/include/cru/common/SelfResolvable.hpp b/include/cru/common/SelfResolvable.hpp
index 94f3ae87..eaa4ce34 100644
--- a/include/cru/common/SelfResolvable.hpp
+++ b/include/cru/common/SelfResolvable.hpp
@@ -39,9 +39,27 @@ class SelfResolvable {
   SelfResolvable() : resolver_(new T*(static_cast<T*>(this))) {}
   SelfResolvable(const SelfResolvable&) = delete;
   SelfResolvable& operator=(const SelfResolvable&) = delete;
-  SelfResolvable(SelfResolvable&&) = delete;
-  SelfResolvable& operator=(SelfResolvable&&) = delete;
-  virtual ~SelfResolvable() { (*resolver_) = nullptr; }
+
+  // Resolvers to old object will resolve to new object.
+  SelfResolvable(SelfResolvable&& other)
+      : resolver_(std::move(other.resolver_)) {
+    (*resolver_) = static_cast<T*>(this);
+  }
+
+  // Old resolvers for this object will resolve to nullptr.
+  // Other's resolvers will now resolve to this.
+  SelfResolvable& operator=(SelfResolvable&& other) {
+    if (this != &other) {
+      (*resolver_) = nullptr;
+      resolver_ = std::move(other.resolver_);
+      (*resolver_) = static_cast<T*>(this);
+    }
+    return *this;
+  }
+
+  virtual ~SelfResolvable() {
+    if (resolver_ != nullptr) (*resolver_) = nullptr;
+  }
 
   ObjectResolver<T> CreateResolver() { return ObjectResolver<T>(resolver_); }
 
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