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30 lines
887 B
C++
30 lines
887 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/adapted/std_integral_constant.hpp>
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#include <boost/hana/detail/constexpr.hpp>
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#include <boost/hana/detail/static_assert.hpp>
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#include <boost/hana/functional.hpp>
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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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int main() {
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//! [main]
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BOOST_HANA_CONSTEXPR_LAMBDA auto safe_make_unsigned = [](auto t) {
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return eval_if(lift<std::is_integral>(t),
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[=](auto id) { return id(template_<std::make_unsigned_t>)(t); },
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always(t)
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);
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};
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BOOST_HANA_STATIC_ASSERT(safe_make_unsigned(type<void>) == type<void>);
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BOOST_HANA_STATIC_ASSERT(safe_make_unsigned(type<int>) == type<unsigned int>);
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//! [main]
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}
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