- Boost-users - lists.preview.boost.org

RE: [Boost-Users] Using date_time::microsec_clock in windows ?
by Jim.Hyslop 16 Jul '03

16 Jul '03

Jeff Garland wrote: > It actually shouldn't be too hard. It is really a matter of > swapping out the > Windows API function calls to return the times and then adjusting > appropriately. (follow-ups should probably be diverted to the Boost developers list) I'm not sure if this has been discussed or not, but it may be harder than you imagine. The Windows API functions dealing with time have a resolution of approximately 10 milliseconds. Even the functions that return values of hectonanoseconds (100 nanoseconds) are limited to this resolution. To see what I mean, run this program: #include <windows.h> #include <iostream> #include <map> const int numElements=10000; DWORD WINAPI timeThread(void *) { // Step 1: fill in an array of FILETIME elements with the time // returned by GetSystemTimeAsFileTime. Make sure each element // is unique - don't increment index until the time we just read // is actually different from the last time we read. FILETIME ft[numElements]; memset(&ft[0], 0, sizeof(ft)); GetSystemTimeAsFileTime(&ft[0]); int index=1; while (index < numElements) { GetSystemTimeAsFileTime(&ft[index]); if (ft[index].dwLowDateTime != ft[index-1].dwLowDateTime) index++; } // Step 2: calculate the delta from one timestamp to the next. Store // this delta in a map<int, int> where the key is the delta, and the value // is the number of times that delta appears. For example, with the timestamps: // 0, 5, 11, 16, 21, 25 // we get the deltas: // 5, 6, 5, 5, 4 // the map will contain three entries: pair(4, 1 ), pair( 5, 3 ), pair( 6, 1 ) unsigned smallestDiff=(unsigned)-1, largestDiff=0; ULARGE_INTEGER endTime; ULARGE_INTEGER startTime; startTime.LowPart = ft[0].dwLowDateTime; startTime.HighPart = ft[0].dwHighDateTime; std::map<int, int> distribution; for (index=1; index<numElements; ++index) { endTime.LowPart = ft[index].dwLowDateTime; endTime.HighPart = ft[index].dwHighDateTime; unsigned difference = endTime.QuadPart - startTime.QuadPart; std::cout << difference << "\n"; if (difference < smallestDiff) smallestDiff = difference; if (difference > largestDiff) largestDiff = difference; startTime = endTime; distribution[difference]++; } // step 3: dump the stats. endTime.LowPart = ft[numElements-1].dwLowDateTime; endTime.HighPart = ft[numElements-1].dwHighDateTime; startTime.LowPart = ft[0].dwLowDateTime; startTime.HighPart = ft[0].dwHighDateTime; std::cout << numElements << " samples. Smallest delta: " << smallestDiff/10000.0 << "ms; Largest delta: " << largestDiff/10000.0 << "ms; Average: " << unsigned long (endTime.QuadPart - startTime.QuadPart) / (numElements * 10000.0) << "ms\nDistribution:" << std::endl; for (std::map<int, int>::iterator i = distribution.begin(); i != distribution.end(); ++i) { std::cout << (*i).first << ": " << (*i).second << "\n"; } return 0; } int main() { std::cout << "Note: this program will run for approximately " << numElements/100 << " seconds\nwith no output, at real-time priority. \n" "Your system may appear to hang while this program is running.\n" "Rest assured it *will* terminate." << std::endl; HANDLE threadHandle = CreateThread(NULL, 0, timeThread, 0, CREATE_SUSPENDED, 0); SetThreadPriority(threadHandle, THREAD_PRIORITY_TIME_CRITICAL); ResumeThread(threadHandle); WaitForSingleObject(threadHandle, -1); } When I ran it on NT4 SP6, the distribution was as follows: 100136: 7614 100137: 2359 200272: 1 500680: 17 500685: 7 600822: 1 (the units are hectonanoseconds, divide by 10 to get microseconds). I'm guessing the 50 and 60 ms timings are related to task switching or other O/S overhead. On a machine running Windows 2000 SP 3, the results were: 100144: 9999 -- Jim

2 1

Help with boost functional
by Carl Waldbieser 16 Jul '03

16 Jul '03

The following code produces errors when compiled on MSVC6: ************* Start test.cpp ************************ #include <iostream> #include "boost/functional.hpp" struct Foo { int operator()(int x) const {return x+1;} }; typedef class boost::const_mem_fun1_t<int,struct Foo,int> FType; int main() { Foo foo; std::cout << foo(1) << "\n"; //This works //std::cout << boost::bind2nd<FType>(boost::mem_fun(&Foo::operator ()), 7)(&foo) << "\n"; //This does not. std::cout << boost::bind2nd(boost::mem_fun(&Foo::operator ()), 7)(&foo) << "\n"; return 0; } ****************** end test.cpp ******************* The error is as follows: --------------------Configuration: mem_fun_test - Win32 Debug-------------------- Compiling... test.cpp C:\Documents and Settings\waldbcar.WALDBCAR\My Documents\My Projects\VC\test\mem_fun_test\test.cpp(20) : error C2782: 'class boost::binder2nd<Operation> __cdecl boost::bind2nd(Operation &,const Operation &)' : template parameter 'Operation' is ambig uous could be 'int' or 'class boost::const_mem_fun1_t<int,struct Foo,int>' C:\Documents and Settings\waldbcar.WALDBCAR\My Documents\My Projects\VC\test\mem_fun_test\test.cpp(20) : error C2782: 'class boost::binder2nd<Operation> __cdecl boost::bind2nd(const Operation &,const Operation &)' : template parameter 'Operation' is ambiguous could be 'int' or 'class boost::const_mem_fun1_t<int,struct Foo,int>' Error executing cl.exe. test.obj - 2 error(s), 0 warning(s) I am just not seeing where the ambiguity is coming from. The commented out line will actually compile and run as I expected, but I can't figure out why the compiler can't deduce the template argument. Any ideas? Thanks in Advance! Carl Waldbieser waldbie[at-sign-here]attglobal.net

2 1

libbgl-viz.a instead of libbglviz.a
by dhofstee 16 Jul '03

16 Jul '03

Hi, I'm quite new at using boost (downloaded 1.30.0 a couple of days ago). I noticed that when I wanted to make libbglviz.a, as described in http://www.boost.org/libs/graph/doc/read-graphviz.html, there was already a makefile. "make libbglviz.a" does not work, but "make libbgl-viz.a" will. A second documentation error is in http://www.boost.org/libs/property_map/property_map.html, where the example is not equal to the actual cpp file. generic_foo_algorithm is on this page, but the file just mentions foo. I think it is a glitch in the doc, but if different... Comments?, David NL

2 1

Is vc7 test unresolved external cpp_main still a problem?
by dick.bridges＠tais.com 16 Jul '03

16 Jul '03

The last reference to this failure I found in the archive was from Feb 19th. I got boost_1_30_0.zip from SourceForge yesterday. Have I missed an update to something somewhere? TIA <bjam log> ...found 2392 targets... ...updating 28 targets... FileClone libs\regex\build\bin-stage\boost_regex_debug.lib 1 file(s) copied. FileClone libs\regex\build\bin-stage\boost_regex_debug.lib 1 file(s) copied. FileClone libs\regex\build\bin-stage\boost_regex.lib 1 file(s) copied. FileClone libs\regex\build\bin-stage\boost_regex.lib 1 file(s) copied. vc-Link libs\date_time\build\bin\boost_date_time.dll\vc7\debug\runtime-link-dynamic\boost_date_time.dll libs\date_time\build\bin\boost_date_time.dll\vc7\debug\runtime-link-dynamic\boost_date_time.lib vc-Link libs\date_time\build\bin\boost_date_time.dll\vc7\release\runtime-link-dynamic\boost_date_time.dll libs\date_time\build\bin\boost_date_time.dll\vc7\release\runtime-link-dynamic\boost_date_time.lib LINK : warning LNK4089: all references to 'MSVCP71.dll' discarded by /OPT:REF vc-Link libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.dll libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.lib cpp_main.obj : error LNK2019: unresolved external symbol "int __cdecl cpp_main(int,char * * const)" (?cpp_main@@YAHHQAPAD@Z) referenced in function "public: virtual int __thiscall `anonymous namespace'::cpp_main_caller::function(void)" (?function@cpp_main_caller@?A0xe9549083@@UAEHXZ) libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.dll : fatal error LNK1120: 1 unresolved externals "link" /nologo /INCREMENTAL:NO /DEBUG /DLL /subsystem:console /out:"libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.dll" /IMPLIB:"libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.lib" /LIBPATH:"C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\lib" @"libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.CMD" ...failed vc-Link libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.dll libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single\boost_prg_exec_monitor.lib... ...skipped <libs!test!build\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single>boost_prg_exec_monitor.dll for lack of <libs!test!build\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-single>boost_prg_exec_monitor.lib... vc-Link libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-multi\boost_prg_exec_monitor.dll libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-multi\boost_prg_exec_monitor.lib cpp_main.obj : error LNK2019: unresolved external symbol "int __cdecl cpp_main(int,char * * const)" (?cpp_main@@YAHHQAPAD@Z) referenced in function "public: virtual int __thiscall `anonymous namespace'::cpp_main_caller::function(void)" (?function@cpp_main_caller@?A0xe9549083@@UAEHXZ) libs\test\build\bin\boost_prg_exec_monitor.dll\vc7\debug\runtime-link-static\threading-multi\boost_prg_exec_monitor.dll : fatal error LNK1120: 1 unresolved externals <snip> ...failed updating 12 targets... ...skipped 12 targets... ...updated 4 targets... </bjam log>

3 2

Using date_time::microsec_clock in windows ?
by J�r�me Poulin 15 Jul '03

15 Jul '03

Hi, I would like to know why we can't use the microsec_clock in a windows env. I know there is no gettimeofday function, but there is certainly a viable workaround. Why it isn't in boost yet, is it planned ? How do you guys suggest to emulate the microsec_clock on a Windows compilation ? Thanks. Jérôme

2 1

profiling ublas code
by cerenoc 15 Jul '03

15 Jul '03

Hi, I am trying to optimize my ublas-containing code. The profile from gprof showed these two functions as the top 2 time-consuming ones. Could somebody explain to me a little bit about what these mean? % cumulative self self total time seconds seconds calls ms/call ms/call name 23.76 93.11 93.11 137604968 0.00 0.00 vector<int, allocator<int> > * __uninitialized_copy_aux<vector<int, allocator<int> > *, vector<int, allocator<int> > *>(vector<int, allocator<int> > *, vector<int, allocator<int> > *, vector<int, allocator<int> > *, __false_type) 21.49 177.31 84.20 41208000 0.00 0.00 vector<int, allocator<int> >::operator=(vector<int, allocator<int> > const &) Thanks, Julian

2 1

Assertion tripped in boost::uniform_int
by mvogt＠juptech.com 15 Jul '03

15 Jul '03

Hello. I just experienced an assertion failure using the boost::minstd_rand generator: /home/packages/boost_1_29_0/boost/random/uniform_int.hpp:50: boost::uniform_int<UniformRandomNumberGenerator, IntType>::uniform_int (UniformRandomNumberGenerator &, IntType, IntType) [with UniformRandomNumberGenerator = boost::random::linear_congruential<int32_t, 48271, 0, 2147483647, 399268537>, IntType = int]: Assertion `min < max' failed. I use the following code to generate random numbers: typedef boost::minstd_rand RngType; extern RngType pseudo_rng; template <class T> T random(T min, T max) { boost::random_number_generator<RngType, T> rng(pseudo_rng); return rng(max - min + 1) + min; } Am I doing something wrong, or is there a fault in the uniform_int algorithm? Thanks, Matt. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify mail.administrator(a)jupiters.com.au ********************************************************************** [Non-text portions of this message have been removed]

4 4

Spirit v1.7.0 and v1.6.1 Released
by Joel de Guzman 13 Jul '03

13 Jul '03

Hello, Spirit v1.7.0 and v1.6.1 have been released. Get it here: Spirit v1.7.0: http://tinyurl.com/gssn Spirit v1.6.1: http://tinyurl.com/gsss Take note that by convention, odd minor version releases (e.g. 1.7.0) are developmental while even minor version releases (e.g. 1.6.1) are stable. What's new: http://spirit.sourceforge.net/distrib/change_log.html Have fun!!! Cheers, -- Joel de Guzman joel at boost-consulting.com http://www.boost-consulting.com http://spirit.sf.net

1 0

Logging library ?
by drkm 13 Jul '03

13 Jul '03

Hello. Is there any logging fonctionality in the Boost libraries ? I found nothing. If there is nothing, is there a plan to add a such library to Boost ? --drkm

2 1

MPL::lambda issue: what am I doing wrong?
by Brian Simpson 11 Jul '03

11 Jul '03

I want to express a "type-mapping" scheme. My implementation idea is this: have the user define an MPL sequence comprised exclusively of std::pair derivations. He can then instantiate my template class with his sequence as the argument. My template then derives two MPL sequences, one containing the "first" types, the other containing the "second" types. Here is the attempt: <code> namespace ls { using namespace boost::mpl; using namespace placeholders; template <class TypePairSequence> struct list_splitter { template <class STDPAIR> struct first_type { typedef typename STDPAIR::first_type type; }; template <class STDPAIR> struct second_type { typedef typename STDPAIR::second_type type; }; typedef typename transform < TypePairSequence , first_type<_1> > ::type first_types; typedef typename transform < TypePairSequence , second_type<_1> >::type second_types; }; }//end namespace ls </code> Here is an attempt to instantiate: 1> typedef boost::mpl::list< std::pair<long, short>, std::pair<char, double> > associated_types; 2> typedef ls::list_splitter<associated_types> split_associated_types; 3> typedef split_associated_types::first_types first_types; 4> typedef split_associated_types::second_types second_types; 5> typedef boost::mpl::at_c<first_types, 0>::type first_first_t; Code lines 1-2 compile fine. When I add line 3, I get the following error: "no type named `first_type' in `struct boost::mpl::arg<1>'". If you need more: <error> temp.h: In instantiation of `ls::list_splitter<associated_types>::first_type<boost::mpl::arg<1> >': boost/mpl/transform.hpp:41: instantiated from `boost::mpl::apply1<ls::list_splitter<associated_types>::first_type<boost::m pl::arg<1> >, std::pair<char, double> >' boost/mpl/transform.hpp:41: instantiated from `boost::mpl::aux::transform_op<ls::list_splitter<associated_types>::first_ty pe<boost::mpl::arg<1> > >::apply<boost::mpl::null_node, std::pair<char, double> >' boost/mpl/aux_/preprocessed/gcc/fold_backward_impl.hpp:74: instantiated from `boost::mpl::aux::fold_backward_impl<2, boost::mpl::list_iterator<boost::mpl::list2<std::pair<long int, short int>, std::pair<char, double> > >, boost::mpl::list_iterator<boost::mpl::null_node>, boost::mpl::null_node, boost::mpl::protect<boost::mpl::aux::transform_op<ls::list_splitter<associat ed_types>::first_type<boost::mpl::arg<1> > > >, boost::mpl::arg<1> >' boost/mpl/fold_backward.hpp:45: instantiated from `boost::mpl::fold_backward<associated_types, boost::mpl::null_node, boost::mpl::protect<boost::mpl::aux::transform_op<ls::list_splitter<associat ed_types>::first_type<boost::mpl::arg<1> > > >, boost::mpl::arg<1> >' boost/mpl/transform.hpp:64: instantiated from `boost::mpl::algo_::transform<associated_types, ls::list_splitter<associated_types>::first_type<boost::mpl::arg<1> > >' temp.h:35: instantiated from `ls::list_splitter<associated_types>' temp.h:53: instantiated from here temp.h:19: no type named `first_type' in `struct boost::mpl::arg<1>' </error> I'm sure I'm overlooking something simple. Could someone point me in the right direction? I'm using gcc3.2.2 on Solaris 9. TIA, Brian

2 4