From 74bb9cd27242b9320f99ff4d2b50c3051576cc14 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 8 Feb 2022 16:53:51 +0800
Subject: ...

---
 include/cru/common/ClonablePtr.h | 216 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 216 insertions(+)
 create mode 100644 include/cru/common/ClonablePtr.h

(limited to 'include/cru/common/ClonablePtr.h')

diff --git a/include/cru/common/ClonablePtr.h b/include/cru/common/ClonablePtr.h
new file mode 100644
index 00000000..39b5b454
--- /dev/null
+++ b/include/cru/common/ClonablePtr.h
@@ -0,0 +1,216 @@
+#pragma once
+
+#include <cstddef>
+#include <functional>
+#include <memory>
+#include <type_traits>
+
+namespace cru {
+template <typename TClonable>
+class ClonablePtr {
+  template <typename T>
+  friend class ClonablePtr;
+
+ public:
+  using element_type = typename std::unique_ptr<TClonable>::element_type;
+  using pointer = typename std::unique_ptr<TClonable>::pointer;
+
+  ClonablePtr() = default;
+  ClonablePtr(std::nullptr_t) noexcept : ptr_(nullptr) {}
+  explicit ClonablePtr(pointer p) noexcept : ptr_(p) {}
+  ClonablePtr(std::unique_ptr<element_type>&& p) noexcept
+      : ptr_(std::move(p)) {}
+  template <typename O,
+            std::enable_if_t<std::is_convertible_v<
+                                 typename ClonablePtr<O>::pointer, pointer>,
+                             int> = 0>
+  ClonablePtr(std::unique_ptr<O>&& p) : ptr_(std::move(p)) {}
+  ClonablePtr(const ClonablePtr& other) : ptr_(other.ptr_->Clone()) {}
+  ClonablePtr(ClonablePtr&& other) = default;
+  template <typename O,
+            std::enable_if_t<std::is_convertible_v<
+                                 typename ClonablePtr<O>::pointer, pointer>,
+                             int> = 0>
+  ClonablePtr(const ClonablePtr<O>& other) : ptr_(other.ptr_->Clone()) {}
+  template <typename O,
+            std::enable_if_t<std::is_convertible_v<
+                                 typename ClonablePtr<O>::pointer, pointer>,
+                             int> = 0>
+  ClonablePtr(ClonablePtr<O>&& other) noexcept : ptr_(std::move(other.ptr_)) {}
+  ClonablePtr& operator=(std::nullptr_t) noexcept {
+    ptr_ = nullptr;
+    return *this;
+  }
+  ClonablePtr& operator=(std::unique_ptr<element_type>&& other) noexcept {
+    ptr_ = std::move(other);
+    return *this;
+  }
+  template <typename O,
+            std::enable_if_t<std::is_convertible_v<
+                                 typename ClonablePtr<O>::pointer, pointer>,
+                             int> = 0>
+  ClonablePtr& operator=(std::unique_ptr<O>&& p) noexcept {
+    ptr_ = std::move(p);
+    return *this;
+  }
+  ClonablePtr& operator=(const ClonablePtr& other) {
+    if (this != &other) {
+      ptr_ = std::unique_ptr<element_type>(other.ptr_->Clone());
+    }
+    return *this;
+  }
+  ClonablePtr& operator=(ClonablePtr&& other) = default;
+  template <typename O,
+            std::enable_if_t<std::is_convertible_v<
+                                 typename ClonablePtr<O>::pointer, pointer>,
+                             int> = 0>
+  ClonablePtr& operator=(const ClonablePtr<O>& other) noexcept {
+    if (this != &other) {
+      ptr_ = std::unique_ptr<element_type>(other.ptr_->Clone());
+    }
+    return *this;
+  }
+  template <typename O,
+            std::enable_if_t<std::is_convertible_v<
+                                 typename ClonablePtr<O>::pointer, pointer>,
+                             int> = 0>
+  ClonablePtr& operator=(ClonablePtr<O>&& other) noexcept {
+    ptr_ = std::move(other.ptr_);
+  }
+
+  ~ClonablePtr() = default;
+
+ public:
+  pointer release() noexcept { return ptr_.release(); }
+  void reset(pointer p = pointer()) noexcept { ptr_.reset(p); }
+  void swap(ClonablePtr& other) noexcept { ptr_.swap(other.ptr_); }
+
+ public:
+  pointer get() const noexcept { return ptr_.get(); }
+
+  operator bool() const noexcept { return ptr_; }
+
+  element_type& operator*() const noexcept { return *ptr_; }
+  pointer operator->() const noexcept { return ptr_.get(); }
+
+  int Compare(const ClonablePtr& other) const noexcept {
+    if (ptr_ == other.ptr_) {
+      return 0;
+    } else if (ptr_ < other.ptr_) {
+      return -1;
+    } else {
+      return 1;
+    }
+  }
+
+  int Compare(nullptr_t) const noexcept { return ptr_ ? 1 : 0; }
+
+ private:
+  std::unique_ptr<element_type> ptr_;
+};
+
+template <typename T>
+void swap(ClonablePtr<T>& left, ClonablePtr<T>& right) noexcept {
+  left.swap(right);
+}
+
+template <typename T>
+bool operator==(const ClonablePtr<T>& left, const ClonablePtr<T>& right) {
+  return left.Compare(right) == 0;
+}
+
+template <typename T>
+bool operator!=(const ClonablePtr<T>& left, const ClonablePtr<T>& right) {
+  return left.Compare(right) != 0;
+}
+
+template <typename T>
+bool operator<(const ClonablePtr<T>& left, const ClonablePtr<T>& right) {
+  return left.Compare(right) < 0;
+}
+
+template <typename T>
+bool operator<=(const ClonablePtr<T>& left, const ClonablePtr<T>& right) {
+  return left.Compare(right) <= 0;
+}
+
+template <typename T>
+bool operator>(const ClonablePtr<T>& left, const ClonablePtr<T>& right) {
+  return left.Compare(right) > 0;
+}
+
+template <typename T>
+bool operator>=(const ClonablePtr<T>& left, const ClonablePtr<T>& right) {
+  return left.Compare(right) >= 0;
+}
+
+template <typename T>
+bool operator==(const ClonablePtr<T>& left, std::nullptr_t) {
+  return left.Compare(nullptr) == 0;
+}
+
+template <typename T>
+bool operator!=(const ClonablePtr<T>& left, std::nullptr_t) {
+  return left.Compare(nullptr) != 0;
+}
+
+template <typename T>
+bool operator<(const ClonablePtr<T>& left, std::nullptr_t) {
+  return left.Compare(nullptr) < 0;
+}
+
+template <typename T>
+bool operator<=(const ClonablePtr<T>& left, std::nullptr_t) {
+  return left.Compare(nullptr) <= 0;
+}
+
+template <typename T>
+bool operator>(const ClonablePtr<T>& left, std::nullptr_t) {
+  return left.Compare(nullptr) > 0;
+}
+
+template <typename T>
+bool operator>=(const ClonablePtr<T>& left, std::nullptr_t) {
+  return left.Compare(nullptr) >= 0;
+}
+
+template <typename T>
+bool operator==(std::nullptr_t, const ClonablePtr<T>& right) {
+  return right.Compare(nullptr) == 0;
+}
+
+template <typename T>
+bool operator!=(std::nullptr_t, const ClonablePtr<T>& right) {
+  return right.Compare(nullptr) != 0;
+}
+
+template <typename T>
+bool operator<(std::nullptr_t, const ClonablePtr<T>& right) {
+  return right.Compare(nullptr) > 0;
+}
+
+template <typename T>
+bool operator<=(std::nullptr_t, const ClonablePtr<T>& right) {
+  return right.Compare(nullptr) >= 0;
+}
+
+template <typename T>
+bool operator>(std::nullptr_t, const ClonablePtr<T>& right) {
+  return right.Compare(nullptr) < 0;
+}
+
+template <typename T>
+bool operator>=(std::nullptr_t, const ClonablePtr<T>& right) {
+  return right.Compare(nullptr) <= 0;
+}
+
+}  // namespace cru
+
+namespace std {
+template <typename T>
+struct hash<cru::ClonablePtr<T>> {
+  std::size_t operator()(const cru::ClonablePtr<T>& p) const {
+    return std::hash<typename cru::ClonablePtr<T>::pointer>(p.get());
+  }
+};
+}  // namespace std
-- 
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