ceph/src/boost/libs/parameter/test/literate/extracting-parameter-types1.cpp

   1
   2 #include <boost/parameter.hpp>
   3
   4 BOOST_PARAMETER_NAME(index)
   5
   6 template <typename ArgumentPack>
   7 typename boost::parameter::value_type<ArgumentPack,tag::index,int>::type
   8     twice_index(ArgumentPack const& args)
   9 {
  10     return 2 * args[_index|42];
  11 }
  12
  13 #include <boost/core/lightweight_test.hpp>
  14
  15 int main()
  16 {
  17     int six = twice_index(_index = 3);
  18     BOOST_TEST_EQ(six, 6);
  19     return boost::report_errors();
  20 }
  21