[parameter] little flaw in tutorial
Hello, the example code in the Boost.Parameter tutorial #includes <boost/parameter/keyword.hpp> as only Boost.Parameter header. This is apparently insufficient, since I get errors regarding incomplete types (e.g. return type `struct boost::parameter::aux::tagged_argument<graphs::tag::index_map, const char[13]>' is incomplete ). With <boost/parameter.hpp> #included, there are no errors. Regards, m Send instant messages to your online friends http://au.messenger.yahoo.com
Martin Wille <mw8329@yahoo.com.au> writes:
Hello,
the example code in the Boost.Parameter tutorial #includes <boost/parameter/keyword.hpp> as only Boost.Parameter header. This is apparently insufficient, since I get errors regarding incomplete types (e.g. return type `struct boost::parameter::aux::tagged_argument<graphs::tag::index_map, const char[13]>' is incomplete ).
With <boost/parameter.hpp> #included, there are no errors.
Are you saying that even when you follow the rule given by http://www.boost.org/libs/parameter/doc/html/index.html#headers-and-namespac..., you still get errors? -- Dave Abrahams Boost Consulting www.boost-consulting.com
David Abrahams wrote:
Are you saying that even when you follow the rule given by http://www.boost.org/libs/parameter/doc/html/index.html#headers-and-namespac..., you still get errors?
To clarify, this code (directly taken from the tutorial) doesn't compile due to incomplete types: #include <iostream> #include <ostream> #include <boost/parameter/keyword.hpp> // no errors when the combined header is used instead namespace graphs { BOOST_PARAMETER_KEYWORD(tag, graph) // Note: no semicolon BOOST_PARAMETER_KEYWORD(tag, visitor) BOOST_PARAMETER_KEYWORD(tag, root_vertex) BOOST_PARAMETER_KEYWORD(tag, index_map) BOOST_PARAMETER_KEYWORD(tag, color_map) } namespace graphs { namespace core { template <class ArgumentPack> void depth_first_search(ArgumentPack const& args) { std::cout << "graph:\t" << args[graph] << std::endl; std::cout << "visitor:\t" << args[visitor] << std::endl; std::cout << "root_vertex:\t" << args[root_vertex] << std::endl; std::cout << "index_map:\t" << args[index_map] << std::endl; std::cout << "color_map:\t" << args[color_map] << std::endl; } }} // graphs::core int main() { using namespace graphs; core::depth_first_search(( graph = 'G', visitor = 2, root_vertex = 3.5, index_map = "hello, world", color_map = false)); } Send instant messages to your online friends http://au.messenger.yahoo.com
Martin Wille <mw8329@yahoo.com.au> writes:
David Abrahams wrote:
Are you saying that even when you follow the rule given by http://www.boost.org/libs/parameter/doc/html/index.html#headers-and-namespac..., you still get errors?
To clarify, this code (directly taken from the tutorial)
Well, not exactly, after all. The tutorial is made up of a bunch of incomplete code fragments.
doesn't compile due to incomplete types:
That sort of answers my question, I guess. The rule cited above at least seems inadequate for this particular case. -- Dave Abrahams Boost Consulting www.boost-consulting.com
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