82 lines
2.6 KiB
C++
82 lines
2.6 KiB
C++
// Copyright Louis Dionne 2013-2017
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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/tuple.hpp>
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#include <string>
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namespace hana = boost::hana;
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struct Empty {};
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struct S {
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constexpr S()
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: a{1, Empty{}},
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k(hana::at_c<0>(a)),
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e(hana::at_c<1>(a))
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{ }
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hana::tuple<int, Empty> a;
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int k;
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Empty e;
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};
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constexpr hana::tuple<int, int> getP () { return { 3, 4 }; }
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int main() {
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{
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using T = hana::tuple<int>;
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T t(3);
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 3);
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hana::at_c<0>(t) = 2;
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 2);
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}
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{
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using T = hana::tuple<std::string, int>;
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T t("high", 5);
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == "high");
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 5);
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hana::at_c<0>(t) = "four";
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hana::at_c<1>(t) = 4;
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == "four");
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == 4);
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}
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{
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using T = hana::tuple<double&, std::string, int>;
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double d = 1.5;
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T t(d, "high", 5);
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 1.5);
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == "high");
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<2>(t) == 5);
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hana::at_c<0>(t) = 2.5;
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hana::at_c<1>(t) = "four";
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hana::at_c<2>(t) = 4;
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<0>(t) == 2.5);
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<1>(t) == "four");
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BOOST_HANA_RUNTIME_CHECK(hana::at_c<2>(t) == 4);
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BOOST_HANA_RUNTIME_CHECK(d == 2.5);
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}
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// get on a rvalue tuple
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{
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static_assert(hana::at_c<0>(hana::tuple<float, int, double, long>{0.0f, 1, 2.0, 3L}) == 0, "" );
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static_assert(hana::at_c<1>(hana::tuple<float, int, double, long>{0.0f, 1, 2.0, 3L}) == 1, "" );
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static_assert(hana::at_c<2>(hana::tuple<float, int, double, long>{0.0f, 1, 2.0, 3L}) == 2, "" );
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static_assert(hana::at_c<3>(hana::tuple<float, int, double, long>{0.0f, 1, 2.0, 3L}) == 3, "" );
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static_assert(S().k == 1, "");
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static_assert(hana::at_c<1>(getP()) == 4, "");
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}
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{
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// make sure get<> returns the right types
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struct T { };
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struct U { };
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struct V { };
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hana::tuple<T, U, V> xs{};
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(void)static_cast<T>(hana::at_c<0>(xs));
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(void)static_cast<U>(hana::at_c<1>(xs));
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(void)static_cast<V>(hana::at_c<2>(xs));
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}
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}
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