laurent de Vito wrote:

...

I cannot compile the boost/graph library 1.32.0 on a SUN machine using Sun C++ 5.5. I get the following error message :

boost_1_32_0/boost/graph/depth_first_search.hpp", line 377: Error: Default arguments cannot be added in later declarations of the template function in the same scope.

which does make sense since the compiler cannot decide which routine depth_first_visit to use if the second routine (line 371) has an extra template but the the extra template has a default value.

I don't think the compiler is right. The second version should be used if - the extra function parameter is explicitly provided, or - the function is called with explicitly specified *four* template parameters

In other cases, compiler won't be able to deduce template parameters for the second function, and will call the first one. I'd suggest to report a bug to Sun.

It is a function template and a function template gets its template argument only via function argument not as part of its name. You can not call the function with four template arguments without explicitly specifiing the default argument. IMHO it is not a compiler bug.

...

Unfortunately the compilation was afterwards not successful; this time I got

"boost_1_32_0/boost/graph/named_function_params.hpp", line 500: Error: Cannot return const boost::bgl_named_params, boost::graph_visitor_t, boost::no_property> from a function that should return boost::detail::error_property_not_found.

No idea here. The Sun compiler is not considered very standard-compliant, and guessing what is wrong here is hard.

Do you pass root vertex to dfs search? If not, then the function must return error_property_not_found, and it it tries to return something else, the bug is in the 'Dispatcher' logic.

My prog does nothing more than what you can find in http://www.boost.org/libs/graph/example/connected_components.cpp I simply compute the number of components. Laurent

- Volodya

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