1 // Copyright Louis Dionne 2013-2017 2 // Distributed under the Boost Software License, Version 1.0. 3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) 4 5 #include <boost/hana/assert.hpp> 6 #include <boost/hana/equal.hpp> 7 #include <boost/hana/find.hpp> 8 #include <boost/hana/integral_constant.hpp> 9 #include <boost/hana/optional.hpp> 10 #include <boost/hana/string.hpp> 11 namespace hana = boost::hana; 12 13 14 struct invalid { }; 15 main()16int main() { 17 BOOST_HANA_CONSTANT_CHECK(hana::equal( 18 hana::find(BOOST_HANA_STRING("abcd"), hana::char_c<'a'>), 19 hana::just(hana::char_c<'a'>) 20 )); 21 BOOST_HANA_CONSTANT_CHECK(hana::equal( 22 hana::find(BOOST_HANA_STRING("abcd"), hana::char_c<'c'>), 23 hana::just(hana::char_c<'c'>) 24 )); 25 BOOST_HANA_CONSTANT_CHECK(hana::equal( 26 hana::find(BOOST_HANA_STRING("abcd"), invalid{}), 27 hana::nothing 28 )); 29 } 30