| 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/assert.hpp> |
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| 6 | #include <boost/hana/equal.hpp> |
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| 7 | #include <boost/hana/remove_if.hpp> |
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| 8 | #include <boost/hana/tuple.hpp> |
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| 9 | #include <boost/hana/type.hpp> |
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| 10 | |
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| 11 | #include <string> |
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| 12 | namespace hana = boost::hana; |
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| 13 | |
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| 14 | |
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| 15 | struct Cat { std::string name; }; |
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| 16 | struct Dog { std::string name; }; |
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| 17 | struct Fish { std::string name; }; |
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| 18 | |
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| 19 | bool operator==(Cat const& a, Cat const& b) { return a.name == b.name; } |
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| 20 | bool operator!=(Cat const& a, Cat const& b) { return a.name != b.name; } |
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| 21 | bool operator==(Dog const& a, Dog const& b) { return a.name == b.name; } |
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| 22 | bool operator!=(Dog const& a, Dog const& b) { return a.name != b.name; } |
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| 23 | bool operator==(Fish const& a, Fish const& b) { return a.name == b.name; } |
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| 24 | bool operator!=(Fish const& a, Fish const& b) { return a.name != b.name; } |
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| 25 | |
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| 26 | int main() { |
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| 27 | hana::tuple<Cat, Fish, Dog, Fish> animals{ |
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| 28 | Cat{.name: "Garfield" }, Fish{.name: "Jaws" }, Dog{.name: "Beethoven" }, Fish{.name: "Nemo" } |
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| 29 | }; |
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| 30 | |
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| 31 | auto mammals = hana::remove_if(animals, [](auto const& a) { |
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| 32 | return hana::typeid_(a) == hana::type<Fish>{}; |
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| 33 | }); |
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| 34 | |
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| 35 | BOOST_HANA_RUNTIME_CHECK(mammals == hana::make_tuple(Cat{"Garfield" }, Dog{"Beethoven" })); |
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| 36 | } |
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| 37 | |
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