libs/hana/test/string/find.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/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
  16 int 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 }