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23 lines
879 B
C++
23 lines
879 B
C++
// Copyright Louis Dionne 2013-2022
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// Copyright Jason Rice 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/core/is_a.hpp>
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#include <boost/hana/equal.hpp>
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#include <boost/hana/index_if.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include <boost/hana/optional.hpp>
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#include <boost/hana/tuple.hpp>
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namespace hana = boost::hana;
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constexpr auto xs = hana::make_tuple(0, '1', 2.0);
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static_assert(hana::index_if(xs, hana::is_an<int>) == hana::just(hana::size_c<0>), "");
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static_assert(hana::index_if(xs, hana::is_a<char>) == hana::just(hana::size_c<1>), "");
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static_assert(hana::index_if(xs, hana::is_a<double>) == hana::just(hana::size_c<2>), "");
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static_assert(hana::index_if(xs, hana::is_a<hana::tuple_tag>) == hana::nothing, "");
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int main() { }
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