ceph/src/boost/libs/hana/example/minimum_by.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/length.hpp>
   8 #include <boost/hana/minimum.hpp>
   9 #include <boost/hana/ordering.hpp>
  10 #include <boost/hana/tuple.hpp>
  11 namespace hana = boost::hana;
  12
  13
  14 int main() {
  15     BOOST_HANA_CONSTANT_CHECK(
  16         hana::minimum.by(hana::ordering(hana::length), hana::make_tuple(
  17             hana::make_tuple(),
  18             hana::make_tuple(1, '2'),
  19             hana::make_tuple(3.3, nullptr, 4)
  20         ))
  21         == hana::make_tuple()
  22     );
  23 }