ceph/src/boost/libs/parameter/test/literate/building-argumentpacks0.cpp

   1
   2 #include <boost/parameter.hpp>
   3 #include <iostream>
   4 BOOST_PARAMETER_NAME(index)
   5
   6 template <class ArgumentPack>
   7 int print_index(ArgumentPack const& args)
   8 {
   9     std::cout << "index = " << args[_index] << std::endl;
  10     return 0;
  11 }
  12
  13 int x = print_index(_index = 3);  // prints "index = 3"
  14
  15 BOOST_PARAMETER_NAME(name)
  16
  17 template <class ArgumentPack>
  18 int print_name_and_index(ArgumentPack const& args)
  19 {
  20     std::cout << "name = " << args[_name] << "; ";
  21     return print_index(args);
  22 }
  23
  24 int y = print_name_and_index((_index = 3, _name = "jones"));
  25
  26
  27 namespace parameter = boost::parameter;
  28 using parameter::required;
  29 using parameter::optional;
  30 using boost::is_convertible;
  31 using boost::mpl::_;
  32 parameter::parameters<
  33     required<tag::name, is_convertible<_,char const*> >
  34   , optional<tag::index, is_convertible<_,int> >
  35 > spec;
  36
  37 char const sam[] = "sam";
  38 int twelve = 12;
  39
  40 int z0 = print_name_and_index( spec(sam, twelve) );
  41
  42 int z1 = print_name_and_index(
  43    spec(_index=12, _name="sam")
  44 );
  45 int main()
  46 {}
  47