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- #include <boost/parameter.hpp>
- BOOST_PARAMETER_NAME(index)
- template <typename ArgumentPack>
- typename boost::parameter::value_type<ArgumentPack,tag::index,int>::type
- twice_index(ArgumentPack const& args)
- {
- return 2 * args[_index|42];
- }
- #include <boost/core/lightweight_test.hpp>
- int main()
- {
- int six = twice_index(_index = 3);
- BOOST_TEST_EQ(six, 6);
- return boost::report_errors();
- }
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