1 files changed, 24 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/drop_front.cpp b/src/boost/libs/hana/example/drop_front.cpp
new file mode 100644
index 00000000..c4838837
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+++ b/src/boost/libs/hana/example/drop_front.cpp
@@ -0,0 +1,24 @@
+// 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/drop_front.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/integral_constant.hpp>
+#include <boost/hana/tuple.hpp>
+namespace hana = boost::hana;
+
+
+constexpr auto xs = hana::make_tuple(0, '1', 2.0);
+
+static_assert(hana::drop_front(xs, hana::size_c<0>) == xs, "");
+static_assert(hana::drop_front(xs, hana::size_c<1>) == hana::make_tuple('1', 2.0), "");
+static_assert(hana::drop_front(xs, hana::size_c<2>) == hana::make_tuple(2.0), "");
+BOOST_HANA_CONSTANT_CHECK(hana::drop_front(xs, hana::size_c<3>) == hana::make_tuple());
+BOOST_HANA_CONSTANT_CHECK(hana::drop_front(xs, hana::size_c<4>) == hana::make_tuple());
+
+// drop_front(xs) is equivalent to drop_front(xs, size_t<1>)
+static_assert(hana::drop_front(xs) == hana::make_tuple('1', 2.0), "");
+
+int main() { }