mirror of https://gitee.com/bigwinds/arangodb
39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
// Copyright Louis Dionne 2013-2016
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/assert.hpp>
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#include <boost/hana/comparing.hpp>
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#include <boost/hana/equal.hpp>
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#include <boost/hana/tuple.hpp>
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#include <boost/hana/type.hpp>
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#include <boost/hana/unique.hpp>
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#include <string>
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namespace hana = boost::hana;
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using namespace std::literals;
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// unique without a predicate
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constexpr auto types = hana::tuple_t<int, float, float, char, int, int, int, double>;
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BOOST_HANA_CONSTANT_CHECK(
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hana::unique(types) == hana::tuple_t<int, float, char, int, double>
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);
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int main() {
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// unique with a predicate
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auto objects = hana::make_tuple(1, 2, "abc"s, 'd', "efg"s, "hij"s, 3.4f);
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BOOST_HANA_RUNTIME_CHECK(
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hana::unique(objects, [](auto const& t, auto const& u) {
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return hana::typeid_(t) == hana::typeid_(u);
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})
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== hana::make_tuple(1, "abc"s, 'd', "efg"s, 3.4f)
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);
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// unique.by is syntactic sugar
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BOOST_HANA_RUNTIME_CHECK(
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hana::unique.by(hana::comparing(hana::typeid_), objects) ==
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hana::make_tuple(1, "abc"s, 'd', "efg"s, 3.4f)
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);
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}
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