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3rdparty/boost_1_81_0/libs/hana/example/flatten.cpp 898 Bytes
73ef4ff3   Hu Chunming   提交三方库
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  // Copyright Louis Dionne 2013-2022
  // 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/equal.hpp>
  #include <boost/hana/flatten.hpp>
  #include <boost/hana/optional.hpp>
  #include <boost/hana/tuple.hpp>
  namespace hana = boost::hana;
  
  
  static_assert(
      hana::flatten(hana::make_tuple(hana::make_tuple(1, 2, 3),
                                     hana::make_tuple(4, 5),
                                     hana::make_tuple(6, 7, 8, 9)))
      ==
      hana::make_tuple(1, 2, 3, 4, 5, 6, 7, 8, 9)
  , "");
  
  BOOST_HANA_CONSTANT_CHECK(hana::flatten(hana::nothing) == hana::nothing);
  static_assert(hana::flatten(hana::just(hana::just(1))) == hana::just(1), "");
  BOOST_HANA_CONSTANT_CHECK(hana::flatten(hana::just(hana::nothing)) == hana::nothing);
  
  int main() { }