ceph/src/boost/libs/parameter/test/maybe.cpp

   1 // Copyright Daniel Wallin 2006. Use, modification and distribution is
   2 // subject to the Boost Software License, Version 1.0. (See accompanying
   3 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   4
   5 #include <boost/parameter/keyword.hpp>
   6 #include <boost/parameter/aux_/maybe.hpp>
   7 #include <cassert>
   8
   9 namespace test {
  10
  11 BOOST_PARAMETER_KEYWORD(tag, kw)
  12 BOOST_PARAMETER_KEYWORD(tag, unused)
  13
  14 template <class Args>
  15 int f(Args const& args)
  16 {
  17     return args[kw | 1.f];
  18 }
  19
  20 } // namespace test
  21
  22 int main()
  23 {
  24     using test::kw;
  25     using test::unused;
  26     using test::f;
  27     using boost::parameter::aux::maybe;
  28
  29     assert(f((kw = 0, unused = 0)) == 0);
  30     assert(f(unused = 0) == 1);
  31     assert(f((kw = maybe<int>(), unused = 0)) == 1);
  32     assert(f((kw = maybe<int>(2), unused = 0)) == 2);
  33     return 0;
  34 }
  35