Index: uspace/lib/cpp/include/impl/unordered_set.hpp
===================================================================
--- uspace/lib/cpp/include/impl/unordered_set.hpp	(revision b24bb1ca61d2c265c64e5ea405410940cf9483da)
+++ uspace/lib/cpp/include/impl/unordered_set.hpp	(revision b24bb1ca61d2c265c64e5ea405410940cf9483da)
@@ -0,0 +1,111 @@
+/*
+ * 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_UNORDERED_SET
+#define LIBCPP_UNORDERED_SET
+
+#include <initializer_list>
+#include <internal/hash_map.hpp>
+#include <functional>
+#include <memory>
+#include <utility>
+
+namespace std
+{
+    /**
+     * 23.5.6, class template unordered_set:
+     */
+
+    template<
+        class Key,
+        class Hash = hash<Key>,
+        class Pred = equal_to<Key>,
+        class Alloc = allocator<Key>
+    >
+    class unordered_set;
+
+    /**
+     * 23.5.7, class template unordered_multiset:
+     */
+
+    template<
+        class Key
+        class Hash = hash<Key>,
+        class Pred = equal_to<Key>,
+        class Alloc = allocator<Key>
+    >
+    class unordered_multiset;
+
+    template<class Key, class Hash, class Pred, class Alloc>
+    void swap(unordered_set<Key, Hash, Pred, Alloc>& lhs,
+              unordered_set<Key, Hash, Pred, Alloc>& rhs)
+        noexcept(noexcept(lhs.swap(rhs)))
+    {
+        lhs.swap(rhs);
+    }
+
+    template<class Key, class Hash, class Pred, class Alloc>
+    void swap(unordered_multiset<Key, Hash, Pred, Alloc>& lhs,
+              unordered_multiset<Key, Hash, Pred, Alloc>& rhs)
+        noexcept(noexcept(lhs.swap(rhs)))
+    {
+        lhs.swap(rhs);
+    }
+
+    template<class Key, class Hash, class Pred, class Alloc>
+    bool operator==(unordered_set<Key, Hash, Pred, Alloc>& lhs,
+                    unordered_set<Key, Hash, Pred, Alloc>& rhs)
+    {
+        // TODO: implement
+        return false;
+    }
+
+    template<class Key, class Hash, class Pred, class Alloc>
+    bool operator!=(unordered_set<Key, Hash, Pred, Alloc>& lhs,
+                    unordered_set<Key, Hash, Pred, Alloc>& rhs)
+    {
+        return !(lhs == rhs);
+    }
+
+    template<class Key, class Hash, class Pred, class Alloc>
+    bool operator==(unordered_multiset<Key, Hash, Pred, Alloc>& lhs,
+                    unordered_multiset<Key, Hash, Pred, Alloc>& rhs)
+    {
+        // TODO: implement
+        return false;
+    }
+
+    template<class Key, class Value, class Hash, class Pred, class Alloc>
+    bool operator!=(unordered_multiset<Key, Hash, Pred, Alloc>& lhs,
+                    unordered_multiset<Key, Hash, Pred, Alloc>& rhs)
+    {
+        return !(lhs == rhs);
+    }
+}
+
+#endif
Index: uspace/lib/cpp/include/unordered_set
===================================================================
--- uspace/lib/cpp/include/unordered_set	(revision b24bb1ca61d2c265c64e5ea405410940cf9483da)
+++ uspace/lib/cpp/include/unordered_set	(revision b24bb1ca61d2c265c64e5ea405410940cf9483da)
@@ -0,0 +1,29 @@
+/*
+ * 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.
+ */
+
+#include <impl/unordered_set.hpp>