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diff --git a/bindings/cpp/include/serd/detail/Wrapper.hpp b/bindings/cpp/include/serd/detail/Wrapper.hpp
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+/*
+  Copyright 2019-2021 David Robillard <d@drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef SERD_DETAIL_WRAPPER_HPP
+#define SERD_DETAIL_WRAPPER_HPP
+
+// IWYU pragma: no_include "serd/serd.h"
+
+#include <cstddef>
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+namespace serd {
+
+/// Utility template for a mutable type which removes const if necessary
+template<class T>
+class Optional;
+
+/// Detail namespace
+namespace detail {
+
+/**
+   @defgroup serdpp_detail Serd C++ API details
+   Internal C++ wrapper details that should not be used directly by clients.
+   @ingroup serdpp
+   @{
+*/
+
+/// Utility template for a mutable type which removes const if necessary
+template<class T>
+using Mutable = typename std::remove_const_t<T>;
+
+/// Generic C++ wrapper for a C object
+template<class T, class Deleter>
+class Wrapper
+{
+public:
+  using CType = T;
+
+  explicit Wrapper(T* ptr)
+    : _ptr{ptr, Deleter{}}
+  {}
+
+  Wrapper(T* ptr, Deleter deleter)
+    : _ptr{ptr, std::move(deleter)}
+  {}
+
+  explicit Wrapper(std::unique_ptr<T, Deleter> ptr)
+    : _ptr{std::move(ptr)}
+  {}
+
+  Wrapper(Wrapper&&) noexcept = default;
+  Wrapper& operator=(Wrapper&&) noexcept = default;
+
+  Wrapper(const Wrapper&) = delete;
+  Wrapper& operator=(const Wrapper&) = delete;
+
+  ~Wrapper() = default;
+
+  /// Return a pointer to the underlying C object
+  T* cobj() { return _ptr.get(); }
+
+  /// Return a pointer to the underlying C object
+  const T* cobj() const { return _ptr.get(); }
+
+protected:
+  friend class Optional<T>;
+
+  explicit Wrapper(std::nullptr_t)
+    : _ptr{nullptr}
+  {}
+
+  void reset() { _ptr.reset(); }
+
+  std::unique_ptr<T, Deleter> _ptr;
+};
+
+/**
+   @}
+*/
+
+} // namespace detail
+} // namespace serd
+
+#endif // SERD_DETAIL_WRAPPER_HPP