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diff --git a/third_party/immer/benchmark/set/iter.hpp b/third_party/immer/benchmark/set/iter.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 "benchmark/config.hpp"
+
+#include <immer/set.hpp>
+#include <immer/box.hpp>
+#include <immer/algorithm.hpp>
+#include <hash_trie.hpp> // Phil Nash
+#include <boost/container/flat_set.hpp>
+#include <set>
+#include <unordered_set>
+#include <numeric>
+
+namespace {
+
+template <typename T>
+struct iter_step
+{
+    unsigned operator() (unsigned x, const T& y) const
+    {
+        return x + y;
+    }
+};
+
+template <>
+struct iter_step<std::string>
+{
+    unsigned operator() (unsigned x, const std::string& y) const
+    {
+        return x + (unsigned) y.size();
+    }
+};
+
+template <>
+struct iter_step<immer::box<std::string>>
+{
+    unsigned operator() (unsigned x, const immer::box<std::string>& y) const
+    {
+        return x + (unsigned) y->size();
+    }
+};
+
+template <typename Generator, typename Set>
+auto benchmark_access_std_iter()
+{
+    return [] (nonius::chronometer meter)
+    {
+        auto n  = meter.param<N>();
+        auto g1 = Generator{}(n);
+
+        auto v = Set{};
+        for (auto i = 0u; i < n; ++i)
+            v.insert(g1[i]);
+
+        using step_t = iter_step<typename decltype(g1)::value_type>;
+        measure(meter, [&] {
+            volatile auto c = std::accumulate(v.begin(), v.end(), 0u, step_t{});
+            return c;
+        });
+    };
+}
+
+template <typename Generator, typename Set>
+auto benchmark_access_reduce()
+{
+    return [] (nonius::chronometer meter)
+    {
+        auto n = meter.param<N>();
+        auto g1 = Generator{}(n);
+
+        auto v = Set{};
+        for (auto i = 0u; i < n; ++i)
+            v = v.insert(g1[i]);
+
+        using step_t = iter_step<typename decltype(g1)::value_type>;
+        measure(meter, [&] {
+            volatile auto c = immer::accumulate(v, 0u, step_t{});
+            return c;
+        });
+    };
+}
+
+template <typename Generator, typename Set>
+auto benchmark_access_iter()
+{
+    return [] (nonius::chronometer meter)
+    {
+        auto n = meter.param<N>();
+        auto g1 = Generator{}(n);
+
+        auto v = Set{};
+        for (auto i = 0u; i < n; ++i)
+            v = v.insert(g1[i]);
+
+        using step_t = iter_step<typename decltype(g1)::value_type>;
+        measure(meter, [&] {
+            volatile auto c = std::accumulate(v.begin(), v.end(), 0u, step_t{});
+            return c;
+        });
+    };
+}
+
+} // namespace