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/contains.hpp> 7 #include <boost/hana/drop_while.hpp> 8 #include <boost/hana/integral_constant.hpp> 9 #include <boost/hana/is_empty.hpp> 10 #include <boost/hana/string.hpp> 11 namespace hana = boost::hana; 12 13 main()14int main() { 15 BOOST_HANA_CONSTANT_CHECK(!hana::is_empty(BOOST_HANA_STRING("abcd"))); 16 BOOST_HANA_CONSTANT_CHECK(hana::is_empty(BOOST_HANA_STRING(""))); 17 18 BOOST_HANA_CONSTANT_CHECK(BOOST_HANA_STRING("abcd")[hana::size_c<2>] == hana::char_c<'c'>); 19 20 auto is_vowel = [](auto c) { 21 return c ^hana::in^ BOOST_HANA_STRING("aeiouy"); 22 }; 23 BOOST_HANA_CONSTANT_CHECK( 24 hana::drop_while(BOOST_HANA_STRING("aioubcd"), is_vowel) == BOOST_HANA_STRING("bcd") 25 ); 26 } 27