26 lines
982 B
C++
26 lines
982 B
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/equal.hpp>
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#include <boost/hana/ext/std/integral_constant.hpp>
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#include <boost/hana/filter.hpp>
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#include <boost/hana/functional/compose.hpp>
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#include <boost/hana/optional.hpp>
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#include <boost/hana/tuple.hpp>
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#include <boost/hana/type.hpp>
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#include <type_traits>
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namespace hana = boost::hana;
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// First take the type of an object, and then tell whether it's integral
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constexpr auto is_integral = hana::compose(hana::trait<std::is_integral>, hana::typeid_);
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static_assert(hana::filter(hana::make_tuple(1, 2.0, 3, 4.0), is_integral) == hana::make_tuple(1, 3), "");
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static_assert(hana::filter(hana::just(3), is_integral) == hana::just(3), "");
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BOOST_HANA_CONSTANT_CHECK(hana::filter(hana::just(3.0), is_integral) == hana::nothing);
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int main() { }
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