From 14ec8e92b45a2eae5bdb3d459cee9633ea129359 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Thu, 10 Sep 2026 14:33:19 +0200
Subject: kstd/memory: introduce observer_ptr casts

---
 libs/kstd/kstd/bits/observer_ptr.hpp | 42 ++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

(limited to 'libs')

diff --git a/libs/kstd/kstd/bits/observer_ptr.hpp b/libs/kstd/kstd/bits/observer_ptr.hpp
index d53ab5a0..d0c40549 100644
--- a/libs/kstd/kstd/bits/observer_ptr.hpp
+++ b/libs/kstd/kstd/bits/observer_ptr.hpp
@@ -160,6 +160,48 @@ namespace kstd
     return observer_ptr<ElementType>{pointer};
   }
 
+  template<typename T, typename U>
+  [[nodiscard]] constexpr auto static_pointer_cast(observer_ptr<U> const & other) noexcept -> observer_ptr<T>
+  {
+    return observer_ptr{static_cast<observer_ptr<T>::element_type *>(other.get())};
+  }
+
+  template<typename T, typename U>
+  [[nodiscard]] constexpr auto static_pointer_cast(observer_ptr<U> && other) noexcept -> observer_ptr<T>
+  {
+    return observer_ptr{static_cast<observer_ptr<T>::element_type *>(std::move(other).get())};
+  }
+
+  template<typename T, typename U>
+  [[nodiscard]] constexpr auto dynamic_pointer_cast(observer_ptr<U> const & other) noexcept -> observer_ptr<T> = delete;
+
+  template<typename T, typename U>
+  [[nodiscard]] constexpr auto dynamic_pointer_cast(observer_ptr<U> && other) noexcept -> observer_ptr<T> = delete;
+
+  template<typename T, typename U>
+  [[nodiscard]] constexpr auto const_pointer_cast(observer_ptr<U> const & other) noexcept -> observer_ptr<T>
+  {
+    return observer_ptr{const_cast<observer_ptr<T>::element_type *>(other.get())};
+  }
+
+  template<typename T, typename U>
+  [[nodiscard]] constexpr auto const_pointer_cast(observer_ptr<U> && other) noexcept -> observer_ptr<T>
+  {
+    return observer_ptr{const_cast<observer_ptr<T>::element_type *>(other.get())};
+  }
+
+  template<typename T, typename U>
+  [[nodiscard]] constexpr auto reinterpret_pointer_cast(observer_ptr<U> const & other) noexcept -> observer_ptr<T>
+  {
+    return observer_ptr{reinterpret_cast<observer_ptr<T>::element_type *>(other.get())};
+  }
+
+  template<typename T, typename U>
+  [[nodiscard]] constexpr auto reinterpret_pointer_cast(observer_ptr<U> && other) noexcept -> observer_ptr<T>
+  {
+    return observer_ptr{reinterpret_cast<observer_ptr<T>::element_type *>(other.get())};
+  }
+
 }  // namespace kstd
 
 #endif
\ No newline at end of file
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