[Boost-users] [accumulators] Strange behavior while extracting min using UDT

Hi, The following code when compiled by defining UDT will use a UDT as Sample (without the define, will use double). Some part of code is creating an object (when UDT) is used as acc_sample(0) and that is shown in min. In the following example, I am adding 3 samples and the count confirms that. However, on extracting the min, I get a value that I have not added (and this is created by the following call stack on windows XP using MSVC 2005) ntdll.dll!_DbgBreakPoint@0() acc.exe!acc_sample::acc_sample(double v=0.00000000000000000) Line 35 C++

acc.exe!std::numeric_limits::max() Line 109 + 0x10 bytes C++ acc.exe!boost::numeric::functional::as_max_base::operator()(const acc_sample & __formal={...}) Line 302 + 0x9 bytes C++ acc.exe!boost::detail::function1,boost::numeric::functional::tag > > >::operator()(const acc_sample & a0={...}) Line 69 + 0x10 bytes C++ acc.exe!boost::accumulators::impl::min_impl::min_implboost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumul...,void> >,boost::parameter::aux::empty_arg_list> >(const boost::parameter::aux::arg_listboost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumul...,void> >,boost::parameter::aux::empty_arg_list> & args={...}) Line 38 C++ acc.exe!boost::accumulators::detail::accumulator_wrapper,boost::accumulators::tag::min>::accumulator_wrapper,boost::accumulators::tag::min>boost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumul...,void> >,boost::parameter::aux::empty_arg_list> >(const boost::parameter::aux::arg_listboost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumul...,void> >,boost::parameter::aux::empty_arg_list> & args={...}) Line 284 C++ acc.exe!boost::accumulators::detail::build_acc_listboost::accumulators::impl::count_impl,boost::accumulators::tag::count,boost::accumulators::detail::accumulator_wrapper,boost::accumulators::tag::min> >,1> >,boost::fusion::mpl_iteratorboost::accumulators::impl::count_impl,boost::accumulators::tag::count,boost::accumulators::detail::accumulator_wrapper,boost::accumulators::tag::min> >,2> ,0>::callboost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumul...,void> >,boost::parameter::aux::empty_arg_list> >(const boost::parameter::aux::arg_listboost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumul...,void> >,boost::parameter::aux::empty_arg_list> & args={...}, const boost::fusion::mpl_iteratorboost::accumulators::impl::count_impl,boost::accumulators::tag::count,boost::accumulators::detail::accumulator_wrapper,boost::accumulators::tag::min> >,1> > & f={...}, const boost::fusion::mpl_iteratorboost::accumulators::impl::count_impl,boost::accumulators::tag::count,boost::accumulators::detail::accumulator_wrapper,boost::accumulators::tag::min> >,2> > & l={...}) Line 215 + 0xc bytes C++ acc.exe!boost::accumulators::detail::build_acc_listboost::accumulators::impl::count_impl,boost::accumulators::tag::count,boost::accumulators::detail::accumulator_wrapper,boost::accumulators::tag::min> >,0> >,boost::fusion::mpl_iteratorboost::accumulators::impl::count_impl,boost::accumulators::tag::count,boost::accumulators::detail::accumulator_wrapper,boost::accumulators::tag::min> >,2> ,0>::callboost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumul...,void> >,boost::parameter::aux::empty_arg_list> >(const boost::parameter::aux::arg_listboost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumul...,void> >,boost::parameter::aux::empty_arg_list> & args={...}, const boost::fusion::mpl_iteratorboost::accumulators::impl::count_impl,boost::accumulators::tag::count,boost::accumulators::detail::accumulator_wrapper,boost::accumulators::tag::min> >,0> > & f={...}, const boost::fusion::mpl_iteratorboost::accumulators::impl::count_impl,boost::accumulators::tag::count,boost::accumulators::detail::accumulator_wrapper,boost::accumulators::tag::min> >,2> > & l={...}) Line 215 + 0x2e bytes C++ acc.exe!boost::accumulators::detail::make_acc_listboost::accumulators::impl::count_impl,boost::accumulators::tag::count,boost::accumulators::detail::accumulator_wrapper,boost::accumulators::tag::min> >,boost::parameter::aux::arg_listboost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumul...,void> >,boost::parameter::aux::empty_arg_list> >(const boost::mpl::vector2boost::accumulators::impl::count_impl,boost::accumulators::tag::count,boost::accumulators::detail::accumulator_wrapper,boost::accumulators::tag::min> > & seq={...}, const boost::parameter::aux::arg_listboost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumul...,void> >,boost::parameter::aux::empty_arg_list> & args={...}) Line 234 + 0x2f bytes C++ acc.exe!boost::accumulators::accumulator_setboost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumul...,void>::accumulator_setboost::accumulators::tag::count,boost::accumulators::tag::min,boost::accumul...,void>() Line 146 + 0x31 bytes C++ acc.exe!main(int argc=1, char * * argv=0x00033b18) Line 96 C++ acc.exe!__tmainCRTStartup() Line 327 + 0x12 bytes C kernel32.dll!_BaseProcessStart@4() + 0x23 bytes

// Sample code starts #include #include <iostream> #include <vector> #include #include #include #include #include using namespace std; namespace bacc = boost::accumulators; using namespace bacc; typedef struct { size_t _time; double _value; } time_val_t; /* Wrapper class as I cannot modify time_val_t */ class acc_sample { public: time_val_t _data; acc_sample() { _data._time = 0; _data._value = 0.0; } /* This should never get called: limits is creating an object with 0 * and this object gets extracted as min */ acc_sample(double v) { abort(); } acc_sample(time_t t, double v) { _data._time = t; _data._value = v; } acc_sample(const time_val_t &i) { _data._time = i._time; _data._value = i._value; } acc_sample(const acc_sample &i) { _data._time = i._data._time; _data._value = i._data._value; } bool operator < (const acc_sample &rhs) const { return _data._value < rhs._data._value; } bool operator > (const acc_sample &rhs) const { return _data._value > rhs._data._value; } bool operator == (const acc_sample &rhs) const { return _data._value == rhs._data._value; } bool operator != (const acc_sample &rhs) const { return _data._value != rhs._data._value; } }; int main(int argc, char *argv[]) { #ifdef UDT typedef acc_sample sample_type; sample_type s1(10, 100); sample_type s2(11, 101); sample_type s3(12, 102); sample_type res; #else typedef int sample_type; sample_type s1 = 100; sample_type s2 = 101; sample_type s3 = 102; sample_type res; #endif #if 0 if (s1 == s1) cout << "==" << endl; if (s1 < s2) cout << "<" << endl; if (s2 > s1) cout << ">" << endl; #endif accumulator_set< sample_type, features< tag::count, tag::max, tag::min > > acc; acc(s1); acc(s2); acc(s3); size_t sz = extract_result< tag::count >(acc); cout << "Count:" << sz << endl; res = extract_result< tag::max >(acc); #ifdef UDT cout << "Max: [" << res._data._time << "," << res._data._value << "]" << endl; #else cout << "Max: [" << res << "]" << endl; #endif res = extract_result< tag::min >(acc); #ifdef UDT cout << "Min: [" << res._data._time << "," << res._data._value << "]" << endl; #else cout << "Min: [" << res << "]" << endl; #endif return 0; } // Sample code ends Looking for any help or leads would be of real help. regards, -dhruva Check out the all-new Messenger 9.0! Go to http://in.messenger.yahoo.com/