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