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1 | // Copyright Louis Dionne 2013-2016 |
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/integral_constant.hpp> | |
7 | #include <boost/hana/less.hpp> | |
8 | #include <boost/hana/lexicographical_compare.hpp> | |
9 | #include <boost/hana/tuple.hpp> | |
10 | #include <boost/hana/type.hpp> | |
11 | namespace hana = boost::hana; | |
12 | ||
13 | ||
14 | int main() { | |
15 | // works with elements whose `less` does not return a Constant | |
16 | { | |
17 | constexpr auto xs = hana::make_tuple(1, 2, 3, 4); | |
18 | constexpr auto ys = hana::make_tuple(1, 6, 3, 4); | |
19 | static_assert(hana::lexicographical_compare(xs, ys), ""); | |
20 | } | |
21 | ||
22 | // and with those that do | |
23 | { | |
24 | auto xs = hana::make_tuple(hana::int_c<1>, hana::int_c<2>, hana::int_c<3>); | |
25 | auto ys = hana::make_tuple(hana::int_c<1>, hana::int_c<5>, hana::int_c<3>); | |
26 | BOOST_HANA_CONSTANT_CHECK(hana::lexicographical_compare(xs, ys)); | |
27 | } | |
28 | ||
29 | // it also accepts a custom predicate | |
30 | { | |
31 | auto xs = hana::make_tuple(hana::type_c<int>, hana::type_c<char>, hana::type_c<void*>); | |
32 | auto ys = hana::make_tuple(hana::type_c<int>, hana::type_c<long>, hana::type_c<void*>); | |
33 | BOOST_HANA_CONSTANT_CHECK( | |
34 | hana::lexicographical_compare(xs, ys, [](auto t, auto u) { | |
35 | return hana::sizeof_(t) < hana::sizeof_(u); | |
36 | }) | |
37 | ); | |
38 | } | |
39 | } |