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b32b8144 | 1 | // Copyright Louis Dionne 2013-2017 |
7c673cae FG |
2 | // Distributed under the Boost Software License, Version 1.0. |
3 | // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) | |
4 | ||
5 | #include <boost/hana/assert.hpp> | |
6 | #include <boost/hana/drop_back.hpp> | |
7 | #include <boost/hana/equal.hpp> | |
8 | #include <boost/hana/integral_constant.hpp> | |
9 | #include <boost/hana/tuple.hpp> | |
10 | namespace hana = boost::hana; | |
11 | ||
12 | ||
13 | constexpr auto xs = hana::make_tuple(0, '1', 2.0); | |
14 | ||
15 | static_assert(hana::drop_back(xs, hana::size_c<0>) == xs, ""); | |
16 | static_assert(hana::drop_back(xs, hana::size_c<1>) == hana::make_tuple(0, '1'), ""); | |
17 | static_assert(hana::drop_back(xs, hana::size_c<2>) == hana::make_tuple(0), ""); | |
18 | BOOST_HANA_CONSTANT_CHECK(hana::drop_back(xs, hana::size_c<3>) == hana::make_tuple()); | |
19 | BOOST_HANA_CONSTANT_CHECK(hana::drop_back(xs, hana::size_c<4>) == hana::make_tuple()); | |
20 | ||
21 | static_assert(hana::drop_back(xs) == hana::make_tuple(0, '1'), ""); | |
22 | ||
23 | int main() { } |