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[BGL] Newbie problems with property_map interface
by Erik Arner 24 Jun '02

24 Jun '02

Hi, I'm just starting to learn how to use BGL, and have a few questions. Help would be much appreciated. I'm currently trying to understand the add_vertex function where properties can be assigned to the vertices as the graph is constructed. The only info I've managed to find on the website is this: --------- vertex_descriptor add_vertex(const VertexProperties& p, adjacency_list& g) Adds a vertex to the graph with the specified properties. Returns the vertex descriptor for the new vertex. --------- Does anybody have any examples on how to use this? More specifically, consider the following. I want to construct a graph dynamically, i.e. the graph will grow and shrink during runtime. Let's say I have a Node class with one member (which I want to represent as an "internal property") as follows: class Node { public: std::string name; }; And an Edge class, again with internal properties: class Edge { public: int weight1; double weight2; }; Then my graph object would look something like this, right? typedef adjacency_list < vecS, vecS, directedS, property < vertex_name_t, std::string >, property <edge_weight_t, int, property <edge_weight2_t, double> > > Graph; Where do I go from here? That is, if I have a Node or Edge object in my hand, with members as specified above, how do I add it to the structure (provided that additional info is available regarding which Nodes to connect with the Edge)? I would be very grateful for any help on this. Also, pointers to good (online) tutorials and documented examples of using the BGL, aside from the ones on boost.org, would be appreciated. Thanks, Erik

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VC7 + STLPort (and other assorted questions)
by juxtaposenj 24 Jun '02

24 Jun '02

Is there any way to force boost to build using VC7 and STLPort? I tried the obvious (settings TOOLS=msvc-stlport, and setting MSVC_DIR=<path to VC7>), but I got a ton of compiler errors that way. I ask because VC6 + STLPort 4.5.3 has some serious issues with the the VC6 compiler, causing internal compiler errors (very bad :P). Also, I keep hearing mention of a way to build the boost libs from inside the VC IDE (and the ability to build them for static linking), but I can't find project files, or a Jam option to build static. What am I missing? This is all Boost 1.28.0. Matt Holmes

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regex, stringbuf and MSVC++ 6
by the_d.geo 24 Jun '02

24 Jun '02

What follow is the descriptions of a possible bug. Unfortunately I'm using MSVC++ and ran into some unexpected behavior using boost::regex_format and a stringbuf. I compiled 1.27.0 without the /Oa flag as suggested in the installation notes. In summary, this works: stringbuf line; ... string tmp = line.str(); if (regex_match(tmp, matchInfo, linerx)) { string name = regex_format(matchInfo, "$1"); } but this doesn't: stringbuf line; ... if (regex_match(line.str(), matchInfo, linerx)) { string name = regex_format(matchInfo, "$1"); } By "doesn't work" I mean that 'name' has spurious characteres. If this might be a bug, let me know and I'll track it down to a small, compilable example.

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Trouble with tuple
by marshjray 24 Jun '02

24 Jun '02

Using 1.28.0, in source file "boost/tuple/detail/tuple_basic_no_partial_spec.hpp" (line 651), notice the transposition of <T5> and <T6>: return make_tuple(detail::assign_to_pointee<T1>(&t1), detail::assign_to_pointee<T2>(&t2), detail::assign_to_pointee<T3>(&t3), detail::assign_to_pointee<T4>(&t4), detail::assign_to_pointee<T6>(&t5), <---- detail::assign_to_pointee<T5>(&t6)); <---- Looks like a typo? Thanks, - Marsh

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Boost::Signal ?
by srivatsan raghavan 21 Jun '02

21 Jun '02

hi all, i was looking thru the boost cvs recently, and i saw a signals & slots implementation in the cvs, but as far as i can tell, it's not a part of the standard boost libs.. anyone know it's fate, and if there are plans to include it in the next boost release? __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com

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Thread Priority
by Tobias McNulty 19 Jun '02

19 Jun '02

Is getting/setting thread priority implemented in boost threads? I didn't see any mention of it on the web site, other than the behavior of mutexes under Priority Driven scheduling. Thanks, Toby -- Tobias McNulty Data Description, Inc. 840 Hanshaw Road, Suite 9 Ithaca, NY 14850 Phone: (607) 257-1000 E-mail: tmcnulty(a)datadesk.com Web: www.datadesk.com

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scoped_lock
by tmcnulty1982 19 Jun '02

19 Jun '02

boost::recursive_mutex::scoped_lock is crashing with some unknown exception in its destructor, no matter whether the lock is locked or not. Has anyone else experienced this problem and possibly have a solution? Thanks, Toby

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MS VS 6: passing boost::shared_ptr<T> to a dll function
by lognez 19 Jun '02

19 Jun '02

Hi all, I am trying to pass a smart pointer (boost::shared_ptr<T>) as an argument to a function that is implemented by a dll and called by an executable, but whenever I execute the application, it goes into a loop, no matter what the type of T is. When the function is implemented in the exe or when the function is called from inside the dll it works fine. Does anybody have a clue what could be happening? BTW, I'm not implicating a bug in boost, I know that it could as well be a MS VC++ bug but I would just like to know how this comes and how I can solve it. Corno PS I've tried to post this message directly to the newsgroup but that did not work. Is that news group perhaps read only?

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boost::threads - a few more questions....
by Peter 18 Jun '02

18 Jun '02

I have a few more questions regarding boost::threads: 1) Is is at all possible to get a return value from a function which was passed into a thread - for example after calling thread.join() ?? 2) Assuming that I create a thread from within another thread ( for exaple: from within the "main" thread - main()); is there a mechanism for that newly created thread to notify my "main" thread that it has finished execution?? Is there some sort of library (I am looking for something platform independent) which would allow me to do that?? 3) I would lie to run two threads in a client application. One would be responsible for receiving and the other for sending data. The threads would basically run in infinite loops. Both sending and receiving would be done to/from the SAME socket. My question is: Do i still have to lock the mutex during each opperation?? I have been doing a LOT of testing WITHOUT locking it and have not had my program crash (yet). Is that because the kernel (running win2000 and using the winsock API) is somehow dealing with all the overhead of locking/unlocking the socket, or have I just been lucky?? Thanks in advance for any suggestions. Best to you all Peter

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RE: [Boost-Users] boost::threads queation
by Mark Storer 18 Jun '02

18 Jun '02

This has little to do with boost (which, again, is why I can answer; at least in part) A member function cannot be addressed like a regular function. Ask yourself this question: With just a function pointer to go by, what will the compiler use for 'this'? The Good News: STL contains a template functor to take care of this for you: "std::mem_fun". I haven't messed with it personally, but the docs sure make it sound like it would do the trick. The Bad News: I'm not so sure the thread class will let you use it. I'm not familiar with the function0<> template, so I don't know whether or not std::mem_fun will work with boost::thread. Anybody care to chime in here? --Mark Storer Software Engineer Cardiff Software #include <disclaimer> typedef std::disclaimer<Cardiff> Discard; -----Original Message----- From: Peter [mailto:yg-boost-users@m.gmane.org] Sent: Monday, June 17, 2002 9:09 PM To: boost-users(a)yahoogroups.com Subject: [Boost-Users] boost::threads queation Is it possible to pass a pointer of a class member function into a thread ?? I have no problems passing functions (or pointers to functions rather) which are not members of any classes. However when I try to pass member functions, I get compile errors. I am using MSVS 6.0 on win 2000. The following is a simplified model of my situation. I am trying to create a thread inside a function of one class and pass into it, a pointer of a member function of another class: // all necessary includes; class testClass1 { public: // constructor testClass1() { // init code} ~testClass1() {} void fun1() { // some code} }; class testClass2 { testClass2() { // init code} ~testClass2() {} // SEE HERE PLEASE void fun2() { // some code.. boost::thread myThread(&object1.fun1) ; // PROBLEM HERE // more code... } testClass1 object1; }; int main(int argc, char **argv) { testClass2 class2; // some code... class2.fun2(); // more code.... return 0; } Any help would be greatly appreciated. Thanks in advance. Peter 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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