ceph/src/boost/libs/hana/example/replace_if.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/config.hpp>
   7 #include <boost/hana/equal.hpp>
   8 #include <boost/hana/replace_if.hpp>
   9 #include <boost/hana/tuple.hpp>
  10 namespace hana = boost::hana;
  11
  12
  13 BOOST_HANA_CONSTEXPR_LAMBDA auto negative = [](auto x) {
  14     return x < 0;
  15 };
  16
  17 int main() {
  18     BOOST_HANA_CONSTEXPR_CHECK(
  19         hana::replace_if(hana::make_tuple(-3, -2, -1, 0, 1, 2, 3), negative, 0)
  20                 ==
  21         hana::make_tuple(0, 0, 0, 0, 1, 2, 3)
  22     );
  23 }