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

   1 // Copyright David Abrahams, Daniel Wallin 2005. Use, modification and
   2 // distribution is subject to the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE_1_0.txt or copy at
   4 // http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #include <boost/parameter.hpp>
   7 #include <boost/type_traits/is_convertible.hpp>
   8 #include <boost/mpl/placeholders.hpp>
   9 #include <iostream>
  10
  11 namespace test {
  12
  13 BOOST_PARAMETER_KEYWORD(tag, x)
  14 BOOST_PARAMETER_KEYWORD(tag, y)
  15 BOOST_PARAMETER_KEYWORD(tag, z)
  16
  17 using namespace boost::parameter;
  18 using namespace boost::mpl::placeholders;
  19
  20 struct f_parameters // vc6 is happier with inheritance than with a typedef
  21   : parameters<
  22         optional<tag::x,boost::is_convertible<_,int> >
  23       , optional<tag::y,boost::is_convertible<_,int> >
  24       , optional<tag::z,boost::is_convertible<_,int> >
  25     >
  26 {};
  27
  28 #ifdef BOOST_NO_VOID_RETURNS
  29 BOOST_PARAMETER_FUN(int, f, 0, 3, f_parameters)
  30 #else
  31 BOOST_PARAMETER_FUN(void, f, 0, 3, f_parameters)
  32 #endif
  33 {
  34     std::cout << "x = " << p[x | -1] << std::endl;
  35     std::cout << "y = " << p[y | -2] << std::endl;
  36     std::cout << "z = " << p[z | -3] << std::endl;
  37     std::cout <<  "================" << std::endl;
  38 #ifdef BOOST_NO_VOID_RETURNS
  39     return 0;
  40 #endif
  41 }
  42
  43 }
  44
  45
  46 int main()
  47 {
  48     using namespace test;
  49     f(x = 1, y = 2, z = 3);
  50     f(x = 1);
  51     f(y = 2);
  52     f(z = 3);
  53     f(z = 3, x = 1);
  54 }
  55
  56