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Diffstat (limited to '')
-rw-r--r-- | src/boost/libs/hana/example/drop_back.cpp | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/boost/libs/hana/example/drop_back.cpp b/src/boost/libs/hana/example/drop_back.cpp new file mode 100644 index 000000000..8083c2ee0 --- /dev/null +++ b/src/boost/libs/hana/example/drop_back.cpp @@ -0,0 +1,23 @@ +// 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_back.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_back(xs, hana::size_c<0>) == xs, ""); +static_assert(hana::drop_back(xs, hana::size_c<1>) == hana::make_tuple(0, '1'), ""); +static_assert(hana::drop_back(xs, hana::size_c<2>) == hana::make_tuple(0), ""); +BOOST_HANA_CONSTANT_CHECK(hana::drop_back(xs, hana::size_c<3>) == hana::make_tuple()); +BOOST_HANA_CONSTANT_CHECK(hana::drop_back(xs, hana::size_c<4>) == hana::make_tuple()); + +static_assert(hana::drop_back(xs) == hana::make_tuple(0, '1'), ""); + +int main() { } |