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Problem with File Dependency Example
by Martin Sander 10 Apr '02

10 Apr '02

Hi! (I'm a newbie to boost and English is not my native language) I changed the examples/file_dependencies.cpp from boost 1.0.27 a little bit and I think the output is wrong. The changed File is at http://www.ebx.de/qqq.cpp (just files_e, name and used_by are changed). The program printed "FF" and "GG" with the same time_slot, but they have an "Edge". With "#if 0" instead of "#if 1" on line 106 the result get even worse, "DD" has a lower time_slot than "GG", but "GG" depends on "DD". What is wrong? My code? Did I misuse the example? M.

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Cuthill Mckee Ordering Algorithm
by Sukandar, Erman H. 10 Apr '02

10 Apr '02

On the Graph documentation it is shown an example showing how to get reverse Cuthill-McKee ordering. It uses rbegin() to get it. My question is: how to get the non-reverse Cuthill-McKee ordering. It still give the reverse ordering even after I use begin(). Did I do something wrong? Can someone advise me the correct one (with example, if possible). Erman

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Detect derivation from e.g. addable
by whastingsnj 10 Apr '02

10 Apr '02

Is there a way to detect that a class has been derived from boost::addable<T>, for example? I would like to be able to write something like this: template <typename T> void foo() { //if T derived from boost::addable<T,...> // . . . } The problem, of course, is the base class chaining feature. I do not see how to use boost::is_base_and_derived in this case.

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Newbie needs pointer to currently executing thread.
by dick.bridges＠tais.com 10 Apr '02

10 Apr '02

Threads in a thread_group - derived pool are waiting on a condition. Condition gets notify_one(). How do I get id/pointer for the thread that was released? I've got a feeling I'm gonna be *REAL* embarrassed when I find out, but I can't figure it out. Thanks for any help.

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Where it is Boost.Signal?
by Raul Huertas Diaz 08 Apr '02

08 Apr '02

I kept reading about a library named Boost.Signal. I think that this library is about signal and slots. But I can't find it in Boost. Can someone tell me where it is, please? I look for it in the Files section and in the CVS repository but i can't find it. Thanks in advance. -- Raúl Huertas Díaz rhuertas at tcpsi dot es http://www.tcpsi.es

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Re: [Boost-Users] Building graphviz under VC6
by Wolf, Frank 08 Apr '02

08 Apr '02

Sorry for being inaccurate and thus wasting bandwidth. I meant the part under ...\libs\graph\src\ for the use of read_graphviz I really would be grateful for any help Thanks, Frank -----Ursprüngliche Nachricht----- Von: Jeff Garland [mailto:jeff@crystalclearsoftware.com] Gesendet: Mittwoch, 3. April 2002 17:49 An: Boost-Users(a)yahoogroups.com Betreff: RE: [Boost-Users] Building graphviz under VC6 Graphviz is not a boost library. This question would be more appropriate for graphviz-interest(a)research.att.com. Jeff > -----Original Message----- > From: Wolf, Frank [mailto:Wolf@bms.de] > Sent: Wednesday, April 03, 2002 1:56 AM > To: Boost-Users(a)yahoogroups.com > Subject: [Boost-Users] Building graphviz under VC6 > > > Has anyone succesfully build the graphviz libs under VC6? > I tried to do so, but ran into fatal error LNK1179 > > I really would be grateful for any help > Thanks. > Frank > 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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Tokenizer
by macrodisk 05 Apr '02

05 Apr '02

I have a question about boost::tokenizer. I have a Semicolon separated string, something like: "All;;;;;;Bus;;;;;;BRT;;;;;;All" When I use boost tokenizer, I get "All", "Bus", "BRT",and "All". I want to get the the empty string between the semicolons, seems like the tokenizer takes consecutive semicolons as a single token; is there any way I can change this to represent different strings? boost::char_separator<char> sep(";"); typedef boost::tokenizer<boost::char_separator<char> > tokenizer; tokenizer Id_tokens(IdString, sep); for(tokenizer::iterator Id_tok_iter= Id_tokens.begin(), End_Id_tok_iter = Id_tokens.end(); Id_tok_Iter != End_Id_tok_iter) { //Do Something } Another question, is there some way to assign a different string once a tokenizer is constructed? tokenizer Id_tokens(IdString,sep); Id_tokens.assign(NewString,sep); //Is this possible with the boost tokenizer? I couldn't find any examples to this end in the places I searched. Thank you, Vijay

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Sun WorkShop assertion failed when compiling with -g
by the_d.geo 05 Apr '02

05 Apr '02

FYI, the following piece of code is an excerpt from boost/type_traits/composite_traits.hpp (boost version 1_27_0). Using sun's CC (Sun WorkShop 6 update 2 C++ 5.3. Patch 111685-05 2002/02/03) and debug on (-g), it fails compilation with the following message >> Assertion: (../links/dbg_cstabs.cc, line 611) while processing test.cpp at line 0. I'd assume that it is a bug in the compiler since it compiles fine without the -g flag. --- start code #include <boost/type_traits/ice.hpp> template <typename T> struct is_pointer { BOOST_STATIC_CONSTANT(bool, value = (::boost::type_traits::ice_and< ::boost::detail::is_pointer_helper<T>::value, ::boost::type_traits::ice_not< ::boost::is_member_pointer<T>::value >::value >::value)); }; --- end code

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preprocessor bug
by jkharris01 04 Apr '02

04 Apr '02

Using MSVC6, SP5: BOOST_PP_LIST_AT() doesn't work in a transform function, but BOOST_PP_LIST_FIRST() and BOOST_PP_LIST_REST() work fine I expected the following code to expand to: a , b but instead it expands to BOOST_PP_TUPLE3_ELEM0 BOOST_PP_TUPLE2_ELEM0 BOOST_PP_WHILE0(BOOST_PP_LIST_REST_N_C,BOOST_PP_LIST_REST_N_F,((a,(7,(_,_,0),1),1),0)) , BOOST_PP_TUPLE3_ELEM0 BOOST_PP_TUPLE2_ELEM0 BOOST_PP_WHILE0(BOOST_PP_LIST_REST_N_C,BOOST_PP_LIST_REST_N_F,((b,(8,(_,_,0),1),1),0)) If I change the definition of F to use BOOST_PP_FIRST(X), it works ************* Example code*************** #define F(a,b,X) BOOST_PP_LIST_AT(X,0) #define LST BOOST_PP_TUPLE_TO_LIST(2,( \ BOOST_PP_TUPLE_TO_LIST(2,(a,7)), \ BOOST_PP_TUPLE_TO_LIST(2,(b,8)))) BOOST_PP_LIST_ENUM(BOOST_PP_LIST_TRANSFORM(F,dummy,LST))

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Re: Compiling CRC
by Daryle Walker 04 Apr '02

04 Apr '02

on 4/3/02 3:54 PM, David Brownell at david_brownell(a)hotmail.com wrote: > Daryle, thanks for your response. The code does work on VC6. Here is > the crc.hpp related errors I get when I compile with VC7. [TRUNCATE] I think the first error means that VC7 is choking on the forward declaration of crc_optimal. The other errors cascade from that one. What does "BOOST_CRC_PARM_TYPE" expand to on VC7? -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT mac DOT com

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