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1 files changed, 201 insertions, 0 deletions

diff --git a/include/cru/common/ClonablePtr.hpp b/include/cru/common/ClonablePtr.hpp
new file mode 100644
index 00000000..47a1d3bd
--- /dev/null
+++ b/include/cru/common/ClonablePtr.hpp
@@ -0,0 +1,201 @@
+#pragma once
+
+#include <cstddef>
+#include <functional>
+#include <memory>
+#include <type_traits>
+
+namespace cru {
+template <typename TClonable>
+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) {}
+  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(); }
+
+ 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.get() == right.get();
+}
+
+template <typename T>
+bool operator!=(const ClonablePtr<T>& left, const ClonablePtr<T>& right) {
+  return left.get() != right.get();
+}
+
+template <typename T>
+bool operator<(const ClonablePtr<T>& left, const ClonablePtr<T>& right) {
+  return left.get() < right.get();
+}
+
+template <typename T>
+bool operator<=(const ClonablePtr<T>& left, const ClonablePtr<T>& right) {
+  return left.get() <= right.get();
+}
+
+template <typename T>
+bool operator>(const ClonablePtr<T>& left, const ClonablePtr<T>& right) {
+  return left.get() > right.get();
+}
+
+template <typename T>
+bool operator>=(const ClonablePtr<T>& left, const ClonablePtr<T>& right) {
+  return left.get() >= right.get();
+}
+
+template <typename T>
+bool operator==(const ClonablePtr<T>& left, std::nullptr_t) {
+  return left.get() == nullptr;
+}
+
+template <typename T>
+bool operator!=(const ClonablePtr<T>& left, std::nullptr_t) {
+  return left.get() != nullptr;
+}
+
+template <typename T>
+bool operator<(const ClonablePtr<T>& left, std::nullptr_t) {
+  return left.get() < nullptr;
+}
+
+template <typename T>
+bool operator<=(const ClonablePtr<T>& left, std::nullptr_t) {
+  return left.get() <= nullptr;
+}
+
+template <typename T>
+bool operator>(const ClonablePtr<T>& left, std::nullptr_t) {
+  return left.get() > nullptr;
+}
+
+template <typename T>
+bool operator>=(const ClonablePtr<T>& left, std::nullptr_t) {
+  return left.get() >= nullptr;
+}
+
+template <typename T>
+bool operator==(std::nullptr_t, const ClonablePtr<T>& right) {
+  return nullptr == right.get();
+}
+
+template <typename T>
+bool operator!=(std::nullptr_t, const ClonablePtr<T>& right) {
+  return nullptr != right.get();
+}
+
+template <typename T>
+bool operator<(std::nullptr_t, const ClonablePtr<T>& right) {
+  return nullptr < right.get();
+}
+
+template <typename T>
+bool operator<=(std::nullptr_t, const ClonablePtr<T>& right) {
+  return nullptr <= right.get();
+}
+
+template <typename T>
+bool operator>(std::nullptr_t, const ClonablePtr<T>& right) {
+  return nullptr > right.get();
+}
+
+template <typename T>
+bool operator>=(std::nullptr_t, const ClonablePtr<T>& right) {
+  return nullptr >= right.get();
+}
+
+}  // 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