ceph/src/boost/libs/hana/example/string/iterable.cpp

   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
  14 int 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 }