1 files changed, 45 insertions, 0 deletions
diff --git a/compat/weak-borrowed-ptr.hpp b/compat/weak-borrowed-ptr.hpp
new file mode 100644
index 00000000..ac512c5c
--- /dev/null
+++ b/compat/weak-borrowed-ptr.hpp
@@ -0,0 +1,45 @@
+#pragma once
+#include "borrowed-ptr.hpp"
+
+namespace floormat {
+
+template<typename T>
+class weak_bptr final
+{
+    detail_bptr::control_block* blk;
+
+    static detail_bptr::control_block* _copy(detail_bptr::control_block* ptr);
+    weak_bptr& _copy_assign(detail_bptr::control_block* other) noexcept;
+    weak_bptr& _move_assign(detail_bptr::control_block*& other) noexcept;
+
+public:
+    weak_bptr(std::nullptr_t) noexcept;
+    weak_bptr& operator=(std::nullptr_t) noexcept;
+    weak_bptr() noexcept;
+    ~weak_bptr() noexcept;
+
+    template<detail_bptr::DerivedFrom<T> Y> weak_bptr(const bptr<Y>& ptr) noexcept;
+    template<detail_bptr::DerivedFrom<T> Y> weak_bptr(const weak_bptr<Y>& ptr) noexcept;
+    weak_bptr(const weak_bptr& ptr) noexcept;
+
+    template<detail_bptr::DerivedFrom<T> Y> weak_bptr& operator=(const bptr<Y>& ptr) noexcept;
+    template<detail_bptr::DerivedFrom<T> Y> weak_bptr& operator=(const weak_bptr<Y>& ptr) noexcept;
+    weak_bptr& operator=(const weak_bptr& ptr) noexcept;
+
+    template<detail_bptr::DerivedFrom<T> Y> weak_bptr(weak_bptr<Y>&& ptr) noexcept;
+    weak_bptr(weak_bptr&& ptr) noexcept;
+
+    template<detail_bptr::DerivedFrom<T> Y> weak_bptr& operator=(weak_bptr<Y>&& ptr) noexcept;
+    weak_bptr& operator=(weak_bptr&& ptr) noexcept;
+
+    void reset() noexcept;
+    void swap(weak_bptr& other) noexcept;
+
+    uint32_t use_count() const noexcept;
+    bool expired() const noexcept;
+    bptr<T> lock() const noexcept;
+
+    bool operator==(const weak_bptr<const T>& other) const noexcept;
+};
+
+} // namespace floormat