1 files changed, 25 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/ext/std/integer_sequence/foldable.cpp b/src/boost/libs/hana/example/ext/std/integer_sequence/foldable.cpp
new file mode 100644
index 000000000..4d7c3253f
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+++ b/src/boost/libs/hana/example/ext/std/integer_sequence/foldable.cpp
@@ -0,0 +1,25 @@
+// Copyright Louis Dionne 2013-2017
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+
+#include <boost/hana/assert.hpp>
+#include <boost/hana/ext/std/integer_sequence.hpp>
+#include <boost/hana/unpack.hpp>
+
+#include <tuple>
+#include <utility>
+namespace hana = boost::hana;
+
+
+auto add = [](auto a, auto b, auto c) { return a + b + c; };
+
+int main() {
+    std::tuple<int, long, double> tuple{1, 2l, 3.3};
+
+    auto sum = hana::unpack(std::integer_sequence<int, 0, 1, 2>{}, [&](auto ...i) {
+        // the `i`s are `std::integral_constant<int, ...>`s
+        return add(std::get<decltype(i)::value>(tuple)...);
+    });
+
+    BOOST_HANA_RUNTIME_CHECK(sum == 6.3);
+}