October 2006 - Boost-users - lists.preview.boost.org

Documentation file line endings problem
by Tjernstrom, Staffan 01 Oct '06

01 Oct '06

Folks, I'm throwing this query out in this medium (as a newbie) as I'm unsure of if there is a better forum for the question. It would appear that in the 1.3.1 Windows self-extracting exe, that some .html file(s) [the one I've come across to date is boost/lib/numeric/conversion/doc/converter_policies.html] have got 'extra' ^M characters in them over and beyond the normal Windows line ending. I assume this is an artifact of some kind of cross-platform / cvs activity? The net result is that these files cannot (as they stand) be imported into a multi-platform subversion repository (at least from a Windows client), as the line endings are inconsistent. This issue re-occurs in a few test files, particularly one for Unicode testing which apparently deliberately has bad line endings. Rgds Staffan Tj. Staffan Tjernström | Sr. Programmer - Market Data Systems | www.esignal.com <http://www.esignal.com> eSignal, a division of Interactive Data Corporation (NYSE: IDC) 3955 Point Eden Way | Hayward, CA 94545-3720 | 510.723.1723 | FAX: 510.266.6100 DISCLAIMER: This message (including any files transmitted with it) may contain confidential and / or proprietary information, is the property of Interactive Data Corporation and / or its subsidiaries and is directed only to the addressee(s). If you are not the designated recipient or have reason to believe you received this message in error, please delete this message from your system and notify the sender immediately. An unintended recipient's disclosure, copying, distribution or use of this message, or any attachments, is prohibited and may be unlawful.

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[function] How do you bind two boost::function objects together?
by Jason House 01 Oct '06

01 Oct '06

I'm trying to convert the input argument to a function object using a small helper function object. The code below looks relatively simple, but it doesn't seem to compile. Any ideas what could be wrong? template<typename inputType, typename outputType> boost::function<outputType (int)> convert(boost::function<outputType (inputType)> &object_to_convert){ boost::function<intputType (int)> input_converter(...); // The following fails to compile boost::function<outputType (int)> converted_function (boost::lambda::bind(object_to_convert, input_converter)); return converted_function }

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[Property Tree] Latest version and CVS
by Chris Weed 01 Oct '06

01 Oct '06

Hi, I am interested in using the new Property Tree library, and I was wondering where I can get the latest version. Chris

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[Date_Time]A better algorithm for from_undelimited_string(string)
by 张沈鹏 01 Oct '06

01 Oct '06

It's seems faster than the algorithm now in use. The execute file and project file please see the attach. DateValidate cost : 00:00:17.765546 boost_date_validate cost : 00:00:50.232232 Below is cpp source of the algorithm and test ---------------------------------------------------------------------------------------- #include <boost/lexical_cast.hpp> #include <stdio.h> #include <string.h> #include <stdlib.h> #include <iostream> #include <string> #include <boost/date_time/posix_time/posix_time.hpp> using namespace std; using namespace boost; using namespace boost::posix_time; using namespace boost::gregorian; int create_date() { int year=rand() %200+1900; int month=rand() %20; int day=rand() %40; return year*10000+month*100+day; } void date_validate(int date) { static int daysOfMonth[] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 }; int monthDay = date % 10000; if (monthDay >= 1300) throw bad_month(); if (monthDay > 1231) throw bad_day_of_month(); if (monthDay == 229) { int year = date / 10000; if ( (year % 4) != 0) throw bad_day_of_month(); if (year %100 == 0 && year % 16 != 0) throw bad_day_of_month(); } int month = monthDay / 100; int day = monthDay % 100; if (! (day > 0 && day <= daysOfMonth[month]) ) throw bad_day_of_month(); } bool DateValidate (string date) { try { date_validate( lexical_cast<int> (date)); return true; } catch (...) { return false; } } bool boost_date_validate (string date) { try { from_undelimited_string (date); return true; } catch (...) { return false; } } int main() { int n=1000000; ptime createDateBegin (microsec_clock::local_time() ); for (int i=0;i<n;i++) { int r=create_date(); string t=lexical_cast<string> (r); } ptime createDateEnd (microsec_clock::local_time() ); time_duration createTime=createDateEnd-createDateBegin; cout<<"create_date cost : "<<createDateEnd-createDateBegin<<"\n"; createDateBegin=microsec_clock::local_time(); for (int i=0;i<n;i++) { int r=create_date(); string t=lexical_cast<string> (r); DateValidate (t); } createDateEnd=microsec_clock::local_time(); cout<<"DateValidate cost : "<<createDateEnd-createDateBegin-createTime<<"\n"; createDateBegin=microsec_clock::local_time(); for (int i=0;i<n;i++) { int r=create_date(); string t=lexical_cast<string> (r); boost_date_validate (t); } createDateEnd=microsec_clock::local_time(); cout<<"boost_date_validate cost : "<<createDateEnd-createDateBegin-createTime<<"\n"; cin.get(); return 0; }

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[date_time] Warnings in VC8
by Arkadiy Vertleyb 01 Oct '06

01 Oct '06

Hi, I am getting a few "possible loss of data" warnings while using the datetime library. For example, VC8 complains about the following code in microsec_clock.hpp: boost::uint64_t filetime = ... ... boost::uint32_t sub_sec = (filetime % 10000000) / 10; // microseconds The compiler also complains about similar issue in from_ftime. Is this a known issue? Regards, Arkadiy

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[date_time/posix_time] [Fwd: Warnings with microsec_time_clock.hpp with VC8.0]
by Bill Somerville 01 Oct '06

01 Oct '06

-- Bill Somerville This message has been scanned by MailController - www.MailController.altohiway.com

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date_time: convert std::time_t to printable date in local time
by Andreas Ntaflos 01 Oct '06

01 Oct '06

Hello boost-users, I am quite new to Boost and this is my first post to this list. My problem is quite similar to one posted to this list two years ago [1]. Since there don't seem to be any follow-ups to that message I hope to find an answer by posting here. A program of mine reads a Unix timestamp from a database (the field is simply of type NUMERIC(10,0), written to by PHP's time() [2] function) into a `std::time_t time' object, holding the seconds since the epoch, in UTC. No time zone adjustments are applied as far as I understood. I need to convert this time_t to a ptime (or any other kind of printable, readable string) with time zone adjustments applied. Converting with the from_time_t() method works fine, except that the resulting date and time are still in UTC. What would be the most simple way to have the time_t converted to a ptime with local time zone adjustments? The time zone could be any but it would suffice if it is the one the computer running the program is in. I could even hardcode the time zone into the program. Hopefully I made enough sense to have someone knowing help me out. RTFM answers are most welcome, although I have read much of the docs on the date_time library on the Boost homepage. So if possible please point me to the section in the that is relevant to my problem. If this is not possible with Boost are there any other functions I could use, probably from the standard library? Thanks a lot in advance! Andreas [1] Very long Google cache link: http://www.google.com/search?q=cache:s-MYu63Ev8UJ:lists.boost.org/MailArchi… [2] http://www.php.net/manual/en/function.time.php -- Andreas "daff" Ntaflos Vienna, Austria GPG Fingerprint: 6234 2E8E 5C81 C6CB E5EC 7E65 397C E2A8 090C A9B4

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