Index: uspace/lib/cpp/include/internal/memory/shared_ptr.hpp
===================================================================
--- uspace/lib/cpp/include/internal/memory/shared_ptr.hpp	(revision 3c32c483ffebb7ee4542267eab14b4a7b91003ba)
+++ uspace/lib/cpp/include/internal/memory/shared_ptr.hpp	(revision 3c32c483ffebb7ee4542267eab14b4a7b91003ba)
@@ -0,0 +1,277 @@
+/*
+ * Copyright (c) 2018 Jaroslav Jindrak
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef LIBCPP_INTERNAL_MEMORY_SHARED_PTR
+#define LIBCPP_INTERNAL_MEMORY_SHARED_PTR
+
+#include <exception>
+
+namespace std
+{
+    /**
+     * 20.8.2.1, class bad_weak_ptr:
+     */
+
+    class bad_weak_ptr: public exception
+    {
+        public:
+            bad_weak_ptr() noexcept = default;
+
+            const char* what() const noexcept override
+            {
+                return "std::bad_weak_ptr";
+            }
+    };
+
+    /**
+     * 20.8.2.2, class template shared_ptr:
+     */
+
+    template<class T>
+    class shared_ptr
+    {
+        public:
+            using element_type = T;
+
+            /**
+             * 20.8.2.2.1, constructors:
+             */
+
+            constexpr shared_ptr() noexcept;
+
+            template<class U>
+            explicit shared_ptr(U* ptr);
+
+            template<class U, class D>
+            shared_ptr(U* ptr, D deleter);
+
+            template<class U, class D, class A>
+            shared_ptr(U* ptr, D deleter, A alloc);
+
+            template<class D>
+            shared_ptr(nullptr_t, D deleter);
+
+            template<class D, class A>
+            shared_ptr(nullptr_t, D deleter, A alloc);
+
+            template<class U>
+            shared_ptr(const shared_ptr<U>& other, value_type* ptr);
+
+            shared_ptr(const shared_ptr& other);
+
+            template<class U>
+            shared_ptr(const shared_ptr<U>& other);
+
+            shared_ptr(shared_ptr&& other);
+
+            template<class U>
+            shared_ptr(shared_ptr<U>&& other);
+
+            template<class U>
+            explicit shared_ptr(const weak_ptr<U>& other);
+
+            template<class U, class D>
+            shared_ptr(unique_ptr<U, D>&& other);
+
+            constexpr shared_ptr(nullptr_t) noexcept
+                : shared_ptr{}
+            { /* DUMMY BODY */ }
+
+            /**
+             * 20.8.2.2.2, destructor:
+             */
+
+            ~shared_ptr();
+
+            /**
+             * 20.8.2.2.3, assignment:
+             */
+
+            shared_ptr& operator=(const shared_ptr& rhs) noexcept;
+
+            template<class U>
+            shared_ptr& operator=(const shared_ptr<U>& rhs) noexcept;
+
+            shared_ptr& operator=(shared_ptr&& rhs) noexcept;
+
+            template<class U>
+            shared_ptr& operator=(shared_ptr<U>&& rhs) noexcept;
+
+            template<class U, class D>
+            shared_ptr& operator=(unique_ptr<U, D>&& rhs);
+
+            /**
+             * 20.8.2.2.4, modifiers:
+             */
+
+            void swap(shared_ptr& other) noexcept;
+
+            void reset() noexcept;
+
+            template<class U>
+            void reset(U* ptr);
+
+            template<class U, class D>
+            void reset(U* ptr, D deleter);
+
+            template<class U, class D, class A>
+            void reset(U* ptr, D deleter, A alloc);
+
+            /**
+             * 20.8.2.2.5, observers:
+             */
+
+            element_type* get() const noexcept;
+
+            T& operator*() const noexcept;
+
+            T* operator->() const noexcept;
+
+            long use_count() const noexcept;
+
+            bool unique() const noexcept;
+
+            explicit operator bool() const noexcept;
+
+            template<class U>
+            bool owner_before(const shared_ptr<U>& ptr) const;
+
+            template<class U>
+            bool owner_before(const weak_ptr<U>& ptr) const;
+
+        /* private: */
+    };
+
+    /**
+     * 20.8.2.2.6, shared_ptr creation:
+     */
+
+    template<class T, class... Args>
+    shared_ptr<T> make_shared(Args&&... args);
+
+    template<class T, class A, class... Args>
+    shared_ptr<T> allocate_shared(const A& alloc, Args&&... args);
+
+    /**
+     * 20.8.2.2.7, shared_ptr comparisons:
+     */
+
+    template<class T, class U>
+    bool operator==(const shared_ptr<T>& lhs, const shared_ptr<U>& rhs) noexcept;
+
+    template<class T, class U>
+    bool operator!=(const shared_ptr<T>& lhs, const shared_ptr<U>& rhs) noexcept;
+
+    template<class T, class U>
+    bool operator<(const shared_ptr<T>& lhs, const shared_ptr<U>& rhs) noexcept;
+
+    template<class T, class U>
+    bool operator>(const shared_ptr<T>& lhs, const shared_ptr<U>& rhs) noexcept;
+
+    template<class T, class U>
+    bool operator<=(const shared_ptr<T>& lhs, const shared_ptr<U>& rhs) noexcept;
+
+    template<class T, class U>
+    bool operator>=(const shared_ptr<T>& lhs, const shared_ptr<U>& rhs) noexcept;
+
+    template<class T>
+    bool operator==(const shared_ptr<T>& lhs, nullptr_t) noexcept;
+
+    template<class T>
+    bool operator==(nullptr_t, const shared_ptr<T>& rhs) noexcept;
+
+    template<class T>
+    bool operator!=(const shared_ptr<T>& lhs, nullptr_t) noexcept;
+
+    template<class T>
+    bool operator!=(nullptr_t, const shared_ptr<T>& rhs) noexcept;
+
+    template<class T>
+    bool operator<(const shared_ptr<T>& lhs, nullptr_t) noexcept;
+
+    template<class T>
+    bool operator<(nullptr_t, const shared_ptr<T>& rhs) noexcept;
+
+    template<class T>
+    bool operator>(const shared_ptr<T>& lhs, nullptr_t) noexcept;
+
+    template<class T>
+    bool operator>(nullptr_t, const shared_ptr<T>& rhs) noexcept;
+
+    template<class T>
+    bool operator<=(const shared_ptr<T>& lhs, nullptr_t) noexcept;
+
+    template<class T>
+    bool operator<=(nullptr_t, const shared_ptr<T>& rhs) noexcept;
+
+    template<class T>
+    bool operator>=(const shared_ptr<T>& lhs, nullptr_t) noexcept;
+
+    template<class T>
+    bool operator>=(nullptr_t, const shared_ptr<T>& rhs) noexcept;
+
+    /**
+     * 20.8.2.2.8, shared_ptr specialized algorithms:
+     */
+
+    template<class T>
+    void swap(shared_ptr<T>& lhs, shared_ptr<T>& rhs) noexcept
+    {
+        lhs.swap(rhs);
+    }
+
+    /**
+     * 20.8.2.2.9, shared_ptr casts:
+     */
+
+    template<class T, class U>
+    shared_ptr<T> static_pointer_cast(const shared_ptr<U>& ptr) noexcept;
+
+    template<class T, class U>
+    shared_ptr<T> dynamic_pointer_cast(const shared_ptr<U>& ptr) noexcept;
+
+    template<class T, class U>
+    shared_ptr<T> const_pointer_cast(const shared_ptr<U>& ptr) noexcept;
+
+    /**
+     * 20.8.2.2.10, shared_ptr get_deleter:
+     */
+
+    template<class D, class T>
+    D* get_deleter(const shared_ptr<T>& ptr) noexcept;
+
+    /**
+     * 20.8.2.2.11, shared_ptr I/O:
+     */
+
+    template<class Char, class Traits, class T>
+    basic_ostream<Char, Traits>& operator<<(basic_ostream<Char, Traits>& os,
+                                            const shared_ptr<T>& ptr);
+}
+
+#endif