functor.cpp 566 B

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  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. #include <boost/hana/eval.hpp>
  5. #include <boost/hana/functional/placeholder.hpp>
  6. #include <boost/hana/lazy.hpp>
  7. #include <boost/hana/transform.hpp>
  8. namespace hana = boost::hana;
  9. using hana::_;
  10. int main() {
  11. static_assert(hana::eval(hana::transform(hana::make_lazy(4 / _)(1), _ * 3)) == (4 / 1) * 3, "");
  12. hana::transform(hana::make_lazy(4 / _)(0), _ * 3); // never evaluated
  13. }