length.cpp 656 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/assert.hpp>
  5. #include <boost/hana/equal.hpp>
  6. #include <boost/hana/experimental/view.hpp>
  7. #include <boost/hana/integral_constant.hpp>
  8. #include <boost/hana/length.hpp>
  9. namespace hana = boost::hana;
  10. template <int> struct undefined { };
  11. int main() {
  12. {
  13. auto single = hana::experimental::single_view(undefined<0>{});
  14. BOOST_HANA_CONSTANT_CHECK(hana::equal(
  15. hana::length(single),
  16. hana::size_c<1>
  17. ));
  18. }
  19. }