ceph/src/boost/libs/hana/example/fuse.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/fuse.hpp>
   7 #include <boost/hana/tuple.hpp>
   8 namespace hana = boost::hana;
   9
  10
  11 auto tie = [](auto& ...vars) {
  12     return hana::fuse([&vars...](auto ...values) {
  13         // Using an initializer list to sequence the assignments.
  14         int dummy[] = {0, ((void)(vars = values), 0)...};
  15         (void)dummy;
  16     });
  17 };
  18
  19 int main() {
  20     int a = 0;
  21     char b = '\0';
  22     double c = 0;
  23
  24     tie(a, b, c)(hana::make_tuple(1, '2', 3.3));
  25     BOOST_HANA_RUNTIME_CHECK(a == 1 && b == '2' && c == 3.3);
  26 }