ceph/src/boost/libs/hana/example/maximum.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/greater.hpp>
   8 #include <boost/hana/integral_constant.hpp>
   9 #include <boost/hana/maximum.hpp>
  10 #include <boost/hana/tuple.hpp>
  11 namespace hana = boost::hana;
  12
  13
  14 int main() {
  15     // without a predicate
  16     BOOST_HANA_CONSTANT_CHECK(
  17         hana::maximum(hana::tuple_c<int, -1, 0, 2, -4, 6, 9>) == hana::int_c<9>
  18     );
  19
  20     // with a predicate
  21     auto smallest = hana::maximum(hana::tuple_c<int, -1, 0, 2, -4, 6, 9>, [](auto x, auto y) {
  22         return x > y; // order is reversed!
  23     });
  24     BOOST_HANA_CONSTANT_CHECK(smallest == hana::int_c<-4>);
  25 }