1 files changed, 36 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/functional/on.cpp b/src/boost/libs/hana/example/functional/on.cpp
new file mode 100644
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--- /dev/null
+++ b/src/boost/libs/hana/example/functional/on.cpp
@@ -0,0 +1,36 @@
+// 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/first.hpp>
+#include <boost/hana/functional/on.hpp>
+#include <boost/hana/integral_constant.hpp>
+#include <boost/hana/less.hpp>
+#include <boost/hana/pair.hpp>
+#include <boost/hana/plus.hpp>
+#include <boost/hana/sort.hpp>
+#include <boost/hana/tuple.hpp>
+#include <boost/hana/type.hpp>
+namespace hana = boost::hana;
+
+
+// infix application
+constexpr auto sorted = hana::sort.by(hana::less ^hana::on^ hana::first, hana::make_tuple(
+    hana::make_pair(hana::int_c<3>, 'x'),
+    hana::make_pair(hana::int_c<1>, hana::type_c<void>),
+    hana::make_pair(hana::int_c<2>, 9876)
+));
+
+static_assert(sorted == hana::make_tuple(
+    hana::make_pair(hana::int_c<1>, hana::type_c<void>),
+    hana::make_pair(hana::int_c<2>, 9876),
+    hana::make_pair(hana::int_c<3>, 'x')
+), "");
+
+
+// function call syntax
+constexpr auto x = hana::make_pair(1, 2);
+constexpr auto y = hana::make_pair(10, 20);
+static_assert(hana::on(hana::plus, hana::first)(x, y) == 1 + 10, "");
+
+int main() { }