| // Copyright David Abrahams, Daniel Wallin 2005. Use, modification and |
| // distribution is subject to the Boost Software License, Version 1.0. |
| // (See accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| |
| #include <boost/parameter.hpp> |
| #include <boost/type_traits/is_convertible.hpp> |
| #include <boost/mpl/placeholders.hpp> |
| #include <iostream> |
| |
| namespace test { |
| |
| BOOST_PARAMETER_KEYWORD(tag, x) |
| BOOST_PARAMETER_KEYWORD(tag, y) |
| BOOST_PARAMETER_KEYWORD(tag, z) |
| |
| using namespace boost::parameter; |
| using namespace boost::mpl::placeholders; |
| |
| struct f_parameters // vc6 is happier with inheritance than with a typedef |
| : parameters< |
| optional<tag::x,boost::is_convertible<_,int> > |
| , optional<tag::y,boost::is_convertible<_,int> > |
| , optional<tag::z,boost::is_convertible<_,int> > |
| > |
| {}; |
| |
| #ifdef BOOST_NO_VOID_RETURNS |
| BOOST_PARAMETER_FUN(int, f, 0, 3, f_parameters) |
| #else |
| BOOST_PARAMETER_FUN(void, f, 0, 3, f_parameters) |
| #endif |
| { |
| std::cout << "x = " << p[x | -1] << std::endl; |
| std::cout << "y = " << p[y | -2] << std::endl; |
| std::cout << "z = " << p[z | -3] << std::endl; |
| std::cout << "================" << std::endl; |
| #ifdef BOOST_NO_VOID_RETURNS |
| return 0; |
| #endif |
| } |
| |
| } |
| |
| |
| int main() |
| { |
| using namespace test; |
| f(x = 1, y = 2, z = 3); |
| f(x = 1); |
| f(y = 2); |
| f(z = 3); |
| f(z = 3, x = 1); |
| } |
| |
| |