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

Use vc7 toolset for VC7.1?
by Dick Bridges 16 Dec '02

16 Dec '02

Is there a VC7.1-specific toolset or should I continue to use the vc7 toolset? I'd like to avoid the VC6 and VC7.0 workarounds if possible.

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Building problems with regex on a SuSE 8.1 installation
by beat.schaer＠ruag.com 15 Dec '02

15 Dec '02

Hi I tried to compile boost 1.29.0 on a SuSE 8.1 machine and got the following error: gcc-C++-action libs/regex/build/bin/libboost_regex.so/gcc/release/runtime-link-dynamic/shar ed-linkable-true/cregex.o /home/adtsbuilder/boost_1_29_0/boost/regex/detail/regex_match.hpp: In member function `unsigned int boost::RegEx::GrepFiles(bool (*)(const char*, const boost::RegEx&), const char*, bool, unsigned int)': /home/adtsbuilder/boost_1_29_0/boost/regex/detail/regex_match.hpp:1902: Internal compiler error in expand_call, at calls.c:3049 Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions. The used compiler is the one delivered with SuSE 8.1. It is a gcc 3.2. Does anybody knows what the problem might be? Regards Beat

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shared_ptr does not call destructor
by Ani Taggu 15 Dec '02

15 Dec '02

Hi: I am using windows 2000 with VC 6.0 and boost 1.28. In my project, I have an array of pointers to objects: class foo { public: ~foo() {} private: std::vector<boost::shared_ptr<MyType> > myArr_; }; I found that the destructor for MyType is never called. Printing the shared_ptr::use_count = 6 at ~foo() above. Any suggestions on what could be happening and how to approach the debugging? Thanks, -Ani

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Test Library: Program Execution Monitor output
by klapshin <klapshin＠yahoo.com> 13 Dec '02

13 Dec '02

Hello, I just plugged program execution monitor in my code and there are certain things I don't really like. First of all is not it odd to see a contradictory messages like: --------------------------- no errors detected **** error return code 1 ********** errors detected; see standard output for details *********** --------------------------- I don't really need this "no errors detected" message. Looking into code I found a way to turn it off -- I have to define an environment variable. I have a way to control this behavior. This is good. Bad news though that the way to control is quite an awkward one. I would like to have some internal control, probably overwritable via environment variable. Another concern is that I have no control on return codes in case of exceptions and runtime errors. For instance in my company all programs have to return 1 in case of failure (and 0 on success). Other return codes are no-no. I am sure there are zillions of different environments with different, often contradictory requirements for error handling. The point I am trying to make is that it is not that difficult to make Monitor more flexible, and it will increase its value tremendously. The ultimate solution would be giving user an opportunity to supply error-handling function which will print out whatever it want to, and return desired return code. Best regards, Kirill Lapshin

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weak_ptr and threads
by Duane Murphy 12 Dec '02

12 Dec '02

The application I am working on uses a number of threads to do work. In some cases pointers from one thread (usually the "main" thread) are passed to a worker thread. The worker thread will use this pointer to handle processing of the results (in various ways). The problem that I am concerned about is lifetime control. Objects in the main thread could be deleted before the worker thread has a chance to use them. This of course would be a "bad thing." I am considering investigating the use of weak_ptr as a potential solution to this problem. The basic idea would be to pass weak_ptr's to the worker thread. The worker thread can then check the validity of the weak_ptr before accessing it. Can weak_ptr be used without using shared_ptr? It seems like they are closely tied. I was hoping to use weak_ptr without forcing the use of shared_ptr. Are there other solutions to this problem, besides the obvious "Dont let it happen." :-) [ Note that we are not yet using boost::threads so this is a more general question about managing inter-thread object lifetimes. ] Thanks for your tips and suggestions, ...Duane

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weak_ptr and threads
by Duane Murphy 12 Dec '02

12 Dec '02

The application I am working on uses a number of threads to do work. In some cases pointers from one thread (usually the "main" thread) are passed to a worker thread. The worker thread will use this pointer to handle processing of the results (in various ways). The problem that I am concerned about is lifetime control. Objects in the main thread could be deleted before the worker thread has a chance to use them. This of course would be a "bad thing." I am considering investigating the use of weak_ptr as a potential solution to this problem. The basic idea would be to pass weak_ptr's to the worker thread. The worker thread can then check the validity of the weak_ptr before accessing it. Can weak_ptr be used without using shared_ptr? It seems like they are closely tied. I was hoping to use weak_ptr without forcing the use of shared_ptr. Are there other solutions to this problem, besides the obvious "Dont let it happen." :-) [ Note that we are not yet using boost::threads so this is a more general question about managing inter-thread object lifetimes. ] Thanks for your tips and suggestions, ...Duane

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uBLAS and fast matrix multiplication
by klapshin <klapshin＠yahoo.com> 12 Dec '02

12 Dec '02

Hello, I am considering switching from in-house matrix implementation to uBLAS. Overall impression from uBLAS is quite good, but it seems that uBLAS does not take advantage of fast matrix multiplication algorithms such as Strassen or Vinograd. Is that correct? If yes, are there plans to implement such algorithms? Best regards, Kirill Lapshin.

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Re: [Boost-Users] testing if shared_ptr has been assigned
by dick.bridges＠tais.com 12 Dec '02

12 Dec '02

I should point out that I went 'back' to get() because I got tired of explaining the 'correct' way [ie, if( b ) ] Darin Adler provided in his answer. |---------+----------------------------------------------------> | | Dick | | | Bridges/CSE/IRV/CONTRACTOR/TOSHIBA-TAIS@T| | | OSHIBA-TAIS | | | | | | 12/12/2002 08:07 AM | | | Please respond to Boost-Users | | | | |---------+----------------------------------------------------> >----------------------------------------------------------------------------------------------| | | | To: Boost-Users(a)yahoogroups.com | | cc: | | Subject: Re: [Boost-Users] testing if shared_ptr has been assigned | >----------------------------------------------------------------------------------------------| >From the docs: <snippet> get T * get() const; // never throws Returns: the stored pointer. Throws: nothing. </snippet> Therefore you can use if( b.get() ) or if( b.get() == NULL ) "TEA Hartmann, Steven" To: boost-users(a)yahoogroups.com <SHartmann(a)aus.t cc: elusa.com> Subject: [Boost-Users] testing if shared_ptr has been assigned 12/11/2002 11:01 AM Please respond to Boost-Users I need some help in testing for the condition of whether a shared_ptr has been assigned. In the following example, the "if( b != NULL ) does not work. How would I do this test? typedef boost::shared_ptr<int> IPtr; int i( 0 ); IPtr a( i ); IPtr b; if( some condition ) b = a; if( b != NULL ) { // How should this really be coded? } Best Regards, Steve [Non-text portions of this message have been removed] Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

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RE: [Boost-Users] Test Library: Program Execution Monitor output
by Tom Matelich 12 Dec '02

12 Dec '02

> I don't really need this "no errors detected" message. Looking into > code I found a way to turn it off -- I have to define an environment > variable. > I have a way to control this behavior. This is good. Bad news though > that the way to control is quite an awkward one. I would like to > have some internal control, probably overwritable via environment > variable. In case you hadn't though of this workaround: if(getenv("VAR") == 0) putenv("VAR=defaultvalue"); Not to say a programmatic method is not worthwhile. ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

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RE: [Boost-Users] testing if shared_ptr has been assigned
by TEA Hartmann, Steven 12 Dec '02

12 Dec '02

Thanks all. That works beautifully. -----Original Message----- From: Tom Matelich [mailto:tmatelich@zetec.com] Sent: Thursday, December 12, 2002 12:25 AM To: 'Boost-Users(a)yahoogroups.com' Subject: RE: [Boost-Users] testing if shared_ptr has been assigned if(b) should do it. shared_ptr has an implicit conversion to bool (sort of). > -----Original Message----- > From: TEA Hartmann, Steven [mailto:SHartmann@aus.telusa.com] > Sent: Wednesday, December 11, 2002 11:02 AM > To: boost-users(a)yahoogroups.com > Subject: [Boost-Users] testing if shared_ptr has been assigned > > > I need some help in testing for the condition of whether a > shared_ptr has > been assigned. In the following example, the "if( b != NULL > ) does not > work. How would I do this test? > > typedef boost::shared_ptr<int> IPtr; > > int i( 0 ); > IPtr a( i ); > IPtr b; > > if( some condition ) > b = a; > > if( b != NULL ) { // How should this really be coded? > } > > > Best Regards, > > Steve > > > [Non-text portions of this message have been removed] > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Get 128 Bit SSL Encryption! > http://us.click.yahoo.com/CBxunD/vN2EAA/xGHJAA/EbFolB/TM > -------------------------------------------------------------- > -------~-> > > Info: <http://www.boost.org> > Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> > > > Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. ----------------------------------------------------------------------- Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ [Non-text portions of this message have been removed]

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Re: [Boost-Users] testing if shared_ptr has been assigned
by dick.bridges＠tais.com 12 Dec '02

12 Dec '02

>From the docs: <snippet> get T * get() const; // never throws Returns: the stored pointer. Throws: nothing. </snippet> Therefore you can use if( b.get() ) or if( b.get() == NULL ) "TEA Hartmann, Steven" To: boost-users(a)yahoogroups.com <SHartmann(a)aus.t cc: elusa.com> Subject: [Boost-Users] testing if shared_ptr has been assigned 12/11/2002 11:01 AM Please respond to Boost-Users I need some help in testing for the condition of whether a shared_ptr has been assigned. In the following example, the "if( b != NULL ) does not work. How would I do this test? typedef boost::shared_ptr<int> IPtr; int i( 0 ); IPtr a( i ); IPtr b; if( some condition ) b = a; if( b != NULL ) { // How should this really be coded? } Best Regards, Steve [Non-text portions of this message have been removed] Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

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RE: [Boost-Users] testing if shared_ptr has been assigned
by Tom Matelich 12 Dec '02

12 Dec '02

if(b) should do it. shared_ptr has an implicit conversion to bool (sort of). > -----Original Message----- > From: TEA Hartmann, Steven [mailto:SHartmann@aus.telusa.com] > Sent: Wednesday, December 11, 2002 11:02 AM > To: boost-users(a)yahoogroups.com > Subject: [Boost-Users] testing if shared_ptr has been assigned > > > I need some help in testing for the condition of whether a > shared_ptr has > been assigned. In the following example, the "if( b != NULL > ) does not > work. How would I do this test? > > typedef boost::shared_ptr<int> IPtr; > > int i( 0 ); > IPtr a( i ); > IPtr b; > > if( some condition ) > b = a; > > if( b != NULL ) { // How should this really be coded? > } > > > Best Regards, > > Steve > > > [Non-text portions of this message have been removed] > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Get 128 Bit SSL Encryption! > http://us.click.yahoo.com/CBxunD/vN2EAA/xGHJAA/EbFolB/TM > -------------------------------------------------------------- > -------~-> > > Info: <http://www.boost.org> > Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> > > > Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

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Re: Please post Boost.Python questions to Python's c++-sig
by William Trenker <wtrenker＠hotmail.com> 11 Dec '02

11 Dec '02

David, Thanks for this clarification. I was checking out the c++-sig group yesterday and was wondering what that list's relationship was to the official boost list. Now I know why some of my Pythonic questions here were getting blank stares. Cheers, Bill > William, please post Boost.Python questions here: > http://mail.python.org/mailman/listinfo/c++-sig > > Thanks, > -- > David Abrahams

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Python: Wrapping #define's and enum's
by William Trenker <wtrenker＠hotmail.com> 11 Dec '02

11 Dec '02

Many C/C++ libraries contain one or more .h/.hpp files that define various constants used by that library's API. What is the prescribed method for wrapping #defines that are used to represent constants? Also, how do I wrap anonymous enums? For example, I have a project with an Enumerations.h file containing: #define MSG_A 23 #define MSG_B 25 enum {Red, White, Blue = 40 }; What would the boost wrapper code for the above look like? Thanks, Bill

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RE: [Boost-Users] .cvsignore - I'm stuck
by Tom Matelich 11 Dec '02

11 Dec '02

This won't help with an initial checkout, but you could write a small script like: #this is to be run in the base directory #update just the files in boost, don't recurse cvs up -l #now update the subdirectories you care about cvs up boost cvs up libs Obviously, you'll need to put your own options in there. If you need help making a real script or batch file, let me know. > -----Original Message----- > From: William Trenker <wtrenker(a)hotmail.com> > [mailto:wtrenker@hotmail.com] > Sent: Tuesday, December 10, 2002 1:56 PM > To: Boost-Users(a)yahoogroups.com > Subject: [Boost-Users] .cvsignore - I'm stuck > > > (This isn't really a boost question but I've spent half a day reading > the cvs documentation and am hoping for a bit of help on what I think > is probably a very simple question.) > > I have a blazing 33.6K modem connection to the Internet. So when I > do a cvs update of my copy of the boost tree, the mug shots (.jpg > files) in the people subdirectory take quite a long time to be > checked for differences. I don't really need to update those files > so I am trying to get a .cvsignore file to work in the "people" > subdirectory. (I realize these files may not change very often; > still, I would appreciate knowing how to do a .cvsignore for boost > libraries that I'm not using.) But I can't get cvs to recognize the > .cvsignore file. > > I created a .cvsignore file, with the line "*.jpg", in the people > sub-directory. But when I run "cvs update" in the people > sub-directory (after "cvs login") cvs gives me a "? .cvsignore" > response and continues updating anyway. I thought maybe I have to > "cvs add" the .cvsignore file, but that doesn't work. > > How do I get cvs to "see" my .cvsignore file? > > Thanks, > Bill > > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Get 128 Bit SSL Encryption! > http://us.click.yahoo.com/CBxunD/vN2EAA/xGHJAA/EbFolB/TM > -------------------------------------------------------------- > -------~-> > > Info: <http://www.boost.org> > Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> > > > Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

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.cvsignore - I'm stuck
by William Trenker <wtrenker＠hotmail.com> 11 Dec '02

11 Dec '02

(This isn't really a boost question but I've spent half a day reading the cvs documentation and am hoping for a bit of help on what I think is probably a very simple question.) I have a blazing 33.6K modem connection to the Internet. So when I do a cvs update of my copy of the boost tree, the mug shots (.jpg files) in the people subdirectory take quite a long time to be checked for differences. I don't really need to update those files so I am trying to get a .cvsignore file to work in the "people" subdirectory. (I realize these files may not change very often; still, I would appreciate knowing how to do a .cvsignore for boost libraries that I'm not using.) But I can't get cvs to recognize the .cvsignore file. I created a .cvsignore file, with the line "*.jpg", in the people sub-directory. But when I run "cvs update" in the people sub-directory (after "cvs login") cvs gives me a "? .cvsignore" response and continues updating anyway. I thought maybe I have to "cvs add" the .cvsignore file, but that doesn't work. How do I get cvs to "see" my .cvsignore file? Thanks, Bill

6 5

Boost Preprocessor - Nested repeat?
by midnight2silverlake 11 Dec '02

11 Dec '02

I have what looks like a perfect application for Boost/Preprocessor. I have 192 entries in a Factory Map a portion of which are show below. I'd like to generate the permutations of the three macro inputs, but can't figure out where to start. Any help would be appreciated. #define MAP_ENTRY_MCR( aLang, aType, aAcc ) \ \ mMap[ CKey( aLang, aType, aAcc ) ] \ = CVarX< aLang, aType, aAcc >::Make; MAP_ENTRY_MCR( DCTlanguageC, DCT_DOUBLE , DCT_NONE ); MAP_ENTRY_MCR( DCTlanguageC, DCT_DOUBLE , DCT_INIT ); MAP_ENTRY_MCR( DCTlanguageC, DCT_DOUBLE , DCT_ANYTIME ); MAP_ENTRY_MCR( DCTlanguageC, DCT_FLOAT , DCT_NONE ); ... Thanks, Jeff Flinn

4 9

Errors running thread samples on W2K
by Mahendra Chheda <mchheda＠yahoo.com> 10 Dec '02

10 Dec '02

Hi, I downloaded boost recently and compiled it on my win2000 server using VC++ ver 7.0 (VS.Net) I then compiled some samples from an article by Bill Kempf (http://www.cuj.com/articles/2002/0205/0205a/0205a.htm? topic=articles). I have defined the debug version of boost libs (boost_threadmon.lib & libboost_thread.lib) in my link process. My code samples do compile and link without any errors. However, I seem to be hitting a common error across most of the samples. The error msg is: Assertion failed: !this->empty(), file D:\MMC\Code\boost_1_29_0 \boost/function/f unction_template.hpp, line 324 Assertion failed: !this->empty(), file D:\MMC\Code\boost_1_29_0 \boost/function/f unction_template.hpp, line 324 I get an abort screen to stop my code. Has anyone seen this before. Can someone pls guide me on how to fix this. Thanx. Mahendra

1 0

Which doorway
by Malcolm Smith 10 Dec '02

10 Dec '02

I'm no expert on these type of libraries but I have come to the point where I must find time to study *this* library more. I have a current project that requires some re-writes in specific areas and I'm hoping Boost will be able to make this job easier. Is there something in boost that will ease the implementation of a state-machine type functor. As an example, I am using a 3rd party C++Builder component that makes socket connections to hardware devices. I need to modify the connection code so 'what needs to be done after a connection success/failure' is handled in the appropriate events. The thing is, this connection event can be called due to connections in other areas of the application under different conditions. If I can implement a state based connection handler then I could re-direct the calls to the appropriate (alternate) event. As an example (I'm only just starting to read up on the STL), I know I could use a std::map to hold state values as the key and call the appropriate handler via a pointer to a function in .second - what I'm hoping is there is a library that allows for unrestricted function signatures (different parameter lists) to be associated with state values. To make this clearer // I know this is not valid code but it explains what I'm after typedef std::map<int, *pf(...)> StateFunctions; void Method1(void); int Method2(TCustomClass &MyClass); StateFunctions[1] = Method1; StateFunctions[2] = Method2; Does this make sense to anyone ? I've probably got all the terminology wrong so feel free to correct me where ever applicable. Thanks in advance. -- Malcolm Smith MJ Freelancing- http://www.mjfreelancing.com Software Protection for C++Builder Borland Technology Partner

2 3

Regex++ for CE? Also, trimming code size.
by Brady Reed 10 Dec '02

10 Dec '02

I am very interested in the Unicode version of this library for some Pocket PC apps. Is anyone aware of any ports of regex++ to Windows CE? The dll version of the parser seems to be rather large, about œ meg for the release version, and 600K for the debug version. This seems to be very large (the gnu rx parser is well below 100K), and I would expect there to be a greater difference in the code size between debug and release versions. Is there a way to cut this code sized down? Or do I need to do something different to build it? Thanks, Brady Reed _________________________________________________________________ MSN 8 with e-mail virus protection service: 2 months FREE* http://join.msn.com/?page=features/virus

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parent_iterator
by matt 09 Dec '02

09 Dec '02

I am a newbie to the graph library. I have a directed graph, and given a vertex_descriptor, I would like to access its parents. It is sort of an adjacency_iterator in reverse I believe. Is there such a thing, or do i have to derive it from and existing iterator...? Thanks, Matt

1 0

Python: C++ parse tree tools?
by William Trenker <wtrenker＠hotmail.com> 09 Dec '02

09 Dec '02

Does anyone know if there is a GCC option to save the C++ parse tree to a file? Or has anyone come across a C++ parser utility that does this? I'm building a Python extension for a library that has many .hpp files and I would like to try and automate the generation of the Boost.Python headers for this library. Thanks, Bill

3 2

Regex Match() Abortion
by eydelber 07 Dec '02

07 Dec '02

This probably is annoying me to no end. I have a string that I am matching against a pattern called 'sql'. My program tests 'sql' against 14 possible patterns. The patterns are in an array of strings. EVERYTHING works except for the last pattern. And even then, only when the 2nd sub-expression is longer than a certain length. For example, this works: insert into test (one,two,three) values () Through a lot of testing, I have seen that after the comma delimitted list in the second sub-expression surpasses a certain length, then my program gets aborted at the line if(sqlRegex.Match (sql)) { I am running the latest version of boost regex++, and I am running g++ 2.96 on Linux. I ran gdb, and I seemed to have narrowed down the problem to c_str(), but this is not logical. Here is the part of my program: string checks[] = { /* 0 */ "create table (_ID_) (\\(((\\s*,?\\s*(_ID_) (_TYPES_)( not null)?( unique)?( default ((\\d+(\\.\\d+)?)|(\"[^\"] *\")))?( unique)?\\s*)+)\\))", /* 1 */ "show tables", /* 2 */ "drop table (_ID_)", /* 3 */ "show tdb\\.xml", /* 4 */ "desc( table)? (_ID_)", /* 5 */ "alter table (_ID_) add( column)? ((_ID_) (_TYPES_) ( not null)?( unique)?( default ((\\d+(\\.\\d+)?)|(\"[^\"]*\")))?( unique)?( first| after (_ID_))?)", /* 6 */ "alter table (_ID_) drop( column)? (_ID_)", /* 7 */ "alter table (_ID_) add( column)? \\(((\\s*,?\\s* (_ID_) (_TYPES_)( not null)?( unique)?( default ((\\d+(\\.\\d+)?)| (\"[^\"]*\")))?( unique)?( first| after (_ID_))?\\s*)+)\\)", /* 8 */ "rename table (_ID_) (to|as) (_ID_)", /* 9 */ "alter table (_ID_) alter( column)? (_ID_) (set default ((\\d+(\\.\\d+)?)|(\"[^\"]*\"))|drop default)", /* 10 */ "alter table (_ID_) modify( column)? ((_ID_) (_TYPES_)( not null)?( unique)?( default ((\\d+(\\.\\d+)?)|(\"[^\"] *\")))?( unique)?( first| after (_ID_))?)", /* 11 */ "alter table (_ID_) change( column)? (_ID_) ((_ID_) (_TYPES_)( not null)?( unique)?( default ((\\d+(\\.\\d+)?)|(\"[^\"] *\")))?( unique)?( first| after (_ID_))?)", /* 12 */ "alter table (_ID_) rename( to| as) (_ID_)", /* 13 */ "insert( into)? (_ID_)( \\(((\\s*,?\\s*(_ID_)\\s*)+) \\))? values \\(\\)" }; int checksLength = sizeof checks / sizeof *checks; int i; RegEx sqlRegex; for(i=0;i<checksLength;i++) { sqlRegex.SetExpression(checks[i],true); if(sqlRegex.Match(sql)) { break; } } The interesting thing is that the first string, checks[0] is similar to the insert syntax, and when I use a very long string for the create table syntax, it works perfectly fine. Also, I tried just adding another element to checks, just trying, but that didn't work. Also, I had no such problem for the other 12 cases, it only happens with this last insert case. Any help will be greatly appreciated, I have been stuck on this for days!! Thanks, Kevin

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Missing bjam executable
by Jacek Generowicz 06 Dec '02

06 Dec '02

I'm trying to install Boost on Linux, but the bjam executable http://boost.sourceforge.net/jam-executables/bin.linuxx86/bjam.gz seems to be missing. Is this a known problem, or am I missing something obvious ?

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RE: [Boost-Users] object_pool use ordered_malloc ordered_free. wh y?
by scleary＠jerviswebb.com 06 Dec '02

06 Dec '02

> if construct only, and freeall in ~object_pool. i think it is good. Yes. The destuctor of object_pool will call the destructor of each allocated or constructed object that has not yet been deallocated or destroyed. > can i use object_pool to replace 'new delete'? object_pool provides object-based allocation and deallocation, very similar to new and delete. > the destroy is slow. Destroying single objects that were created from an object_pool uses ordered_free, as you discovered. An object_pool will keep its free list ordered, so that it can run through the "list of allocated objects" in O(N) time instead of O(N**2) time in ~object_pool. It's a performance tradeoff with object_pool::destroy; object_pool was designed more for a "allocate a bunch of objects and then destroy all of them" type of scenario. -Steve

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