1 files changed, 22 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/index_if.cpp b/src/boost/libs/hana/example/index_if.cpp
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index 000000000..098b2b8c2
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+++ b/src/boost/libs/hana/example/index_if.cpp
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+// Copyright Louis Dionne 2013-2017
+// Copyright Jason Rice 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/core/is_a.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/index_if.hpp>
+#include <boost/hana/integral_constant.hpp>
+#include <boost/hana/optional.hpp>
+#include <boost/hana/tuple.hpp>
+namespace hana = boost::hana;
+
+
+constexpr auto xs = hana::make_tuple(0, '1', 2.0);
+
+static_assert(hana::index_if(xs, hana::is_an<int>)   == hana::just(hana::size_c<0>), "");
+static_assert(hana::index_if(xs, hana::is_a<char>)   == hana::just(hana::size_c<1>), "");
+static_assert(hana::index_if(xs, hana::is_a<double>) == hana::just(hana::size_c<2>), "");
+static_assert(hana::index_if(xs, hana::is_a<hana::tuple_tag>) == hana::nothing, "");
+
+int main() { }