I recently started utilize ArBB in a computer vision project. The performance improvement is amazing.However, there is an annoying issue that I would like to see a way to address. When doing arbb::call or arbb::map, if there is a minor error in the argument, it would produce error messages of a mile length (I am using gcc 4.6.0), such as
gauss.cpp:198:4: error: no matching function for call to call()gauss.cpp:198:4: note: candidates are:/opt/intel/arbb/1.0.0.022/include/arbb/cpp/detail/call_template.hpp:41:25: note: arbb_2::closure arbb_2::call(void (*)())...... (omitting many lines ...)/opt/intel/arbb/1.0.0.022/include/arbb/cpp/detail/call_template.hpp:69:62: note: template arbb_2::closure arbb_2::call(const arbb_2::closure&)
I understand the long messages result from many versions of overloading of these functions to support up to 35 arguments.When there is something wrong, the template resolution mechanism would trigger a scan of all such functions, leading to excessively long messages.I am wondering whether there is some way to at least alleviate this problem, otherwise it would be just a headache for both the compiler and the author of the program.Note that C++0x supports variadic template. By exploiting this feature, those 35 or 36 overloads for a function can be possibly merged into one. Variadic template has been supported by latest versions of GCC and CLang. Just a quick thought: might be good idea to set a preprocessing switch or something, such that the user is allowed to turn on variadic template interfaces instead of many-overloads, when the his compiler supports it.