ceph/src/boost/libs/parameter/test/literate/deduced-parameters0.cpp

   1
   2 #include <boost/parameter.hpp>
   3
   4 BOOST_PARAMETER_NAME(name)
   5 BOOST_PARAMETER_NAME(func)
   6 BOOST_PARAMETER_NAME(docstring)
   7 BOOST_PARAMETER_NAME(keywords)
   8 BOOST_PARAMETER_NAME(policies)
   9
  10 struct default_call_policies
  11 {};
  12
  13 struct no_keywords
  14 {};
  15
  16 struct keywords
  17 {};
  18
  19 template <class T>
  20 struct is_keyword_expression
  21   : boost::mpl::false_
  22 {};
  23
  24 template <>
  25 struct is_keyword_expression<keywords>
  26   : boost::mpl::true_
  27 {};
  28
  29 default_call_policies some_policies;
  30
  31 void f()
  32 {}
  33 namespace mpl = boost::mpl;
  34
  35 BOOST_PARAMETER_FUNCTION(
  36     (void), def, tag,
  37
  38     (required (name,(char const*)) (func,*) )   // nondeduced
  39
  40     (deduced
  41       (optional
  42         (docstring, (char const*), "")
  43
  44         (keywords
  45            , *(is_keyword_expression<mpl::_>) // see 5
  46            , no_keywords())
  47
  48         (policies
  49            , *(mpl::not_<
  50                  mpl::or_<
  51                      boost::is_convertible<mpl::_, char const*>
  52                    , is_keyword_expression<mpl::_> // see 5
  53                  >
  54              >)
  55            , default_call_policies()
  56          )
  57        )
  58      )
  59  )
  60  {
  61
  62  }
  63
  64
  65 int main()
  66 {
  67 def("f", &f, some_policies, "Documentation for f");
  68 def("f", &f, "Documentation for f", some_policies);
  69
  70 def(
  71     "f", &f
  72    , _policies = some_policies, "Documentation for f");
  73 }
  74