text: // Copyright Louis Dionne 2013-2016
  // Distributed under the Boost Software License, Version 1.0.
  // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
  
  #include <boost/hana/assert.hpp>
  #include <boost/hana/config.hpp>
  #include <boost/hana/equal.hpp>
  #include <boost/hana/replace_if.hpp>
  #include <boost/hana/tuple.hpp>
  namespace hana = boost::hana;
  
  
  BOOST_HANA_CONSTEXPR_LAMBDA auto negative = [](auto x) {
      return x < 0;
  };
  
  int main() {
      BOOST_HANA_CONSTEXPR_CHECK(
          hana::replace_if(hana::make_tuple(-3, -2, -1, 0, 1, 2, 3), negative, 0)
                  ==
          hana::make_tuple(0, 0, 0, 0, 1, 2, 3)
      );
  }
  