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- // Copyright Louis Dionne 2013-2017
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- #include <boost/hana/assert.hpp>
- #include <boost/hana/ext/std/integral_constant.hpp>
- #include <boost/hana/find.hpp>
- #include <boost/hana/find_if.hpp>
- #include <boost/hana/functional/compose.hpp>
- #include <boost/hana/integral_constant.hpp>
- #include <boost/hana/optional.hpp>
- #include <boost/hana/tuple.hpp>
- #include <boost/hana/type.hpp>
- #include <type_traits>
- namespace hana = boost::hana;
- // First get the type of the object, and then call the trait on it.
- constexpr auto is_integral = hana::compose(hana::trait<std::is_integral>, hana::typeid_);
- constexpr auto is_class = hana::compose(hana::trait<std::is_class>, hana::typeid_);
- static_assert(
- hana::find_if(hana::make_tuple(1.0, 2, '3'), is_integral)
- ==
- hana::just(2)
- , "");
- BOOST_HANA_CONSTANT_CHECK(
- hana::find_if(hana::make_tuple(1.0, 2, '3'), is_class)
- ==
- hana::nothing
- );
- BOOST_HANA_CONSTANT_CHECK(
- hana::find(hana::make_tuple(hana::int_c<1>, hana::char_c<'c'>, hana::type_c<void>), hana::type_c<void>)
- ==
- hana::just(hana::type_c<void>)
- );
- BOOST_HANA_CONSTANT_CHECK(
- hana::find(hana::make_tuple(hana::int_c<1>, hana::char_c<'c'>, hana::type_c<void>), hana::type_c<int>)
- ==
- hana::nothing
- );
- int main() { }
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