Sebastian Weber <sebastian.weber@physik.tu-darmstadt.de> writes:
Hi!
/home/sebi/projects/diplom/src/boost_1_33_1/boost/graph/adjacency_list_io.hpp:151: error: 'boost::GraphParser<Graph_t, VertexProperty, EdgeProperty, VertexPropertySubset, EdgePropertySubset>::operator()(std::istream&) [with Graph_t = boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, boost::no_property, boost::no_property, boost::no_property, boost::listS>, VertexProperty = boost::no_property, EdgeProperty = boost::no_property, VertexPropertySubset = boost::no_property, EdgePropertySubset = boost::no_property]::State' uses local type 'boost::GraphParser<Graph_t, VertexProperty, EdgeProperty, VertexPropertySubset, EdgePropertySubset>::operator()(std::istream&) [with Graph_t = boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, boost::no_property, boost::no_property, boost::no_property, boost::listS>, VertexProperty = boost::no_property, EdgeProperty = boos t::no_property, VertexPropertySubset = boost::no_property, EdgePropertySubset = boost::no_ property]::State'
This says that the GraphParser class -- which you apparently defined in namespace boost; naughty, naughty! -- has an operator() with a
Well, the GraphParser-class is placed in adjacency_list_io within the namespace boost, that wasn't me.
I don't know what you mean. Who was it? I certainly see "boost::GraphParser" in the error message above, so where does adjacency_list_io come into it?
locally-defined type State, and you're trying to pass an instance of that type off to a function template.
It's a rule of C++ that you can't instantiate templates on function-local types.
Oh, as I have learned template-stuff by doing it and not reading a book (which I probably should have), I'm actually not that familiar with this. In short: I don't understand neither the problem nor do I know how to fix it.
Simple: don't define the State type locally to the function. If the type depends on some template parameters of the function, e.g. class State : public foo<VertexProperty> { ... }; you can just define it outside the function as: template <class VertexProperty> class State_ : public foo<VertexProperty> { ... }; and then in the function: typedef State_<VertexProperty> State;
Learning to read your compiler's error messages can be difficult, but it is well worth the effort. STLFilt can help to make them more approachable (http://www.bdsoft.com)
Well, I looked there, but STLFilt doesn't support g++ 4.0 (to be exact: g++-4.0 (GCC) 4.0.2 20050808 (prerelease) (Ubuntu 4.0.1-4ubuntu9)).
I use STLFilt with g++-4 with success.
And gcc-3.3 (and 3.4) DOES compile my code without any complaints.
Not to be blunt, but so what? That doesn't make your code right.
Any other ideas?
Not really; I told you what the problem was. I hope it helped, because there are no other answers AFAIK. -- Dave Abrahams Boost Consulting www.boost-consulting.com