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// 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);
}
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