48 lines
1.4 KiB
C++
48 lines
1.4 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/ext/std/integral_constant.hpp>
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#include <boost/hana/find.hpp>
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#include <boost/hana/find_if.hpp>
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#include <boost/hana/functional/compose.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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#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 get the type of the object, and then call the trait on it.
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constexpr auto is_integral = hana::compose(hana::trait<std::is_integral>, hana::typeid_);
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constexpr auto is_class = hana::compose(hana::trait<std::is_class>, hana::typeid_);
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static_assert(
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hana::find_if(hana::make_tuple(1.0, 2, '3'), is_integral)
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==
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hana::just(2)
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, "");
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BOOST_HANA_CONSTANT_CHECK(
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hana::find_if(hana::make_tuple(1.0, 2, '3'), is_class)
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==
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hana::nothing
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);
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BOOST_HANA_CONSTANT_CHECK(
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hana::find(hana::make_tuple(hana::int_c<1>, hana::char_c<'c'>, hana::type_c<void>), hana::type_c<void>)
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==
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hana::just(hana::type_c<void>)
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);
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BOOST_HANA_CONSTANT_CHECK(
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hana::find(hana::make_tuple(hana::int_c<1>, hana::char_c<'c'>, hana::type_c<void>), hana::type_c<int>)
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==
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hana::nothing
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);
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int main() { }
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