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

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

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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

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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

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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

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