1 files changed, 21 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/functional/placeholder.cpp b/src/boost/libs/hana/example/functional/placeholder.cpp
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index 000000000..31cbc4a55
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+++ b/src/boost/libs/hana/example/functional/placeholder.cpp
@@ -0,0 +1,21 @@
+// 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/functional/placeholder.hpp>
+namespace hana = boost::hana;
+
+
+constexpr auto plus = hana::_ + hana::_;
+static_assert(plus(1, 2) == 1 + 2, "");
+
+constexpr auto increment = hana::_ + 1;
+static_assert(increment(1) == 2, "");
+
+constexpr auto twice = 2 * hana::_;
+static_assert(twice(1) == 2, "");
+
+// Extra arguments are ignored.
+static_assert(twice(1, "ignored") == 2, "");
+
+int main() { }