ceph/src/boost/libs/hana/example/length.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/integral_constant.hpp>
   8 #include <boost/hana/length.hpp>
   9 #include <boost/hana/optional.hpp>
  10 #include <boost/hana/tuple.hpp>
  11 namespace hana = boost::hana;
  12
  13
  14 int main() {
  15     BOOST_HANA_CONSTANT_CHECK(hana::length(hana::make_tuple()) == hana::size_c<0>);
  16     BOOST_HANA_CONSTANT_CHECK(hana::length(hana::make_tuple(1, '2', 3.0)) == hana::size_c<3>);
  17
  18     BOOST_HANA_CONSTANT_CHECK(hana::length(hana::nothing) == hana::size_c<0>);
  19     BOOST_HANA_CONSTANT_CHECK(hana::length(hana::just('x')) == hana::size_c<1>);
  20 }