| 1 | // Copyright Louis Dionne 2013-2022 |
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| 2 | // Distributed under the Boost Software License, Version 1.0. |
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| 3 | // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) |
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| 4 | |
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| 5 | #include <boost/hana/comparing.hpp> |
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| 6 | #include <boost/hana/equal.hpp> |
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| 7 | #include <boost/hana/group.hpp> |
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| 8 | #include <boost/hana/length.hpp> |
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| 9 | #include <boost/hana/range.hpp> |
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| 10 | #include <boost/hana/tuple.hpp> |
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| 11 | namespace hana = boost::hana; |
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| 12 | |
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| 13 | |
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| 14 | int main() { |
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| 15 | constexpr auto sequences = hana::make_tuple( |
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| 16 | hana::make_tuple(1, 2, 3), |
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| 17 | hana::make_tuple('x', 'y', 'z'), |
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| 18 | hana::range_c<long, 0, 1>, |
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| 19 | hana::tuple_t<char, int>, |
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| 20 | hana::range_c<int, 0, 2>, |
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| 21 | hana::make_tuple(123.4, nullptr) |
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| 22 | ); |
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| 23 | |
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| 24 | constexpr auto grouped = hana::group.by(hana::comparing(hana::length), sequences); |
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| 25 | |
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| 26 | static_assert(grouped == hana::make_tuple( |
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| 27 | hana::make_tuple( |
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| 28 | hana::make_tuple(1, 2, 3), |
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| 29 | hana::make_tuple('x', 'y', 'z') |
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| 30 | ), |
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| 31 | hana::make_tuple( |
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| 32 | hana::range_c<long, 0, 1> |
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| 33 | ), |
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| 34 | hana::make_tuple( |
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| 35 | hana::tuple_t<char, int>, |
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| 36 | hana::range_c<int, 0, 2>, |
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| 37 | hana::make_tuple(123.4, nullptr) |
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| 38 | ) |
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| 39 | ), "" ); |
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| 40 | } |
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| 41 | |
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