Added recpt class

1 files changed, 89 insertions, 0 deletions

@@ -0,0 +1,89 @@
+#ifndef RECPTR_H_BCF778F0
+#define RECPTR_H_BCF778F0
+
+namespace hatkirby {
+
+  /**
+   * This class provides a pointer wrapper for an object. The difference between
+   * it and std::unique_ptr is that it has a defined copy constructor, which
+   * uses the object's copy constructor to make a new object. This class is
+   * useful for the situation in which an object needs to have a member variable
+   * of the same type as itself.
+   */
+  template <typename T>
+  class recptr {
+  public:
+
+    recptr(T* ptr) : ptr_(ptr)
+    {
+    }
+
+    ~recptr()
+    {
+      delete ptr_;
+    }
+
+    recptr(const recptr& other)
+      : ptr_(new T(*other.ptr_))
+    {
+    }
+
+    recptr(recptr&& other)
+    {
+      std::swap(ptr_, other.ptr_);
+    }
+
+    recptr& operator=(const recptr& other)
+    {
+      if (ptr_)
+      {
+        delete ptr_;
+      }
+
+      ptr_ = new T(*other.ptr_);
+
+      return *this;
+    }
+
+    recptr& operator=(recptr&& other)
+    {
+      if (ptr_)
+      {
+        delete ptr_;
+
+        ptr_ = nullptr;
+      }
+
+      std::swap(ptr_, other.ptr_);
+
+      return *this;
+    }
+
+    T& operator*()
+    {
+      return *ptr_;
+    }
+
+    T* operator->()
+    {
+      return ptr_;
+    }
+
+    const T& operator*() const
+    {
+      return *ptr_;
+    }
+
+    const T* operator->() const
+    {
+      return ptr_;
+    }
+
+  private:
+
+    T* ptr_ = nullptr;
+  };
+
+}
+
+#endif /* end of include guard: RECPTR_H_BCF778F0 */