Squashed 'third_party/immer/' content from commit ad3e3556d

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diff --git a/immer/set_transient.hpp b/immer/set_transient.hpp
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+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#pragma once
+
+#include <immer/detail/hamts/champ.hpp>
+#include <immer/memory_policy.hpp>
+
+#include <functional>
+
+namespace immer {
+
+/*!
+ * @rst
+ *
+ * .. admonition:: Become a sponsor!
+ *    :class: danger
+ *
+ *    This component is planned but it has **not been implemented yet**.
+ *
+ *    Transiens can critically improve the performance of applications
+ *    intensively using ``set`` and ``map``. If you are working for an
+ *    organization using the library in a commercial project, please consider
+ *    **sponsoring this work**: juanpe@sinusoid.al
+ *
+ * @endrst
+ */
+template <typename T,
+          typename Hash           = std::hash<T>,
+          typename Equal          = std::equal_to<T>,
+          typename MemoryPolicy   = default_memory_policy,
+          detail::hamts::bits_t B = default_bits>
+class set_transient;
+
+} // namespace immer