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29 lines
920 B
C++
29 lines
920 B
C++
/*
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@copyright Louis Dionne 2014
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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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*/
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#include <boost/hana/type.hpp>
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#include <type_traits>
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using namespace boost::hana;
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template <typename ...> struct f { };
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struct x1; struct x2; struct x3;
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int main() {
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// make sure the types are good
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static_assert(std::is_same<decltype(trait<f>()), f<>>{}, "");
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static_assert(std::is_same<decltype(trait<f>(type<x1>)), f<x1>>{}, "");
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static_assert(std::is_same<decltype(trait<f>(type<x1>, type<x2>)), f<x1, x2>>{}, "");
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static_assert(std::is_same<decltype(trait<f>(type<x1>, type<x2>, type<x3>)), f<x1, x2, x3>>{}, "");
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// make sure we can use it; we already made sure the return type was correct
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trait<f>();
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trait<f>(type<x1>);
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trait<f>(type<x1>, type<x2>);
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trait<f>(type<x1>, type<x2>, type<x3>);
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}
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