January 2003 - Boost-users - lists.boost.org

RegEx: (?= ) and (?! )
by Yutaka Emura <yutaka＠emurasoft.com> 02 Jan '03

02 Jan '03

Hi, I am using RegEx in Boost v1.29.0. (?= ) and (?! ) expressions do not seem to work at a certain condition. In the following example, "(?=a)b" should match "b" in "xyzabcdefg", but does not. Similarly, "(?!a)b" should not match "b" in "xyzabcdefg" but it does. Can please let me know what is wrong? Thank you for your reply in advance. Yutaka Emura --------- boost::regex expression; boost::match_results<std::string::const_iterator> subexp; expression.assign("(?=a)b", boost::regbase::perl); if (boost::regex_search((std::string::const_iterator)"xyzabcdefg", (std::string::const_iterator)"xyzabcdefg" + 10, subexp, expression, boost::match_default)) { { // should go here } else { // goes here } expression.assign("(!=a)b", boost::regbase::perl); if (boost::regex_search((std::string::const_iterator)"xyzabcdefg", (std::string::const_iterator)"xyzabcdefg" + 10, subexp, expression, boost::match_default)) { { // goes here } else { // should go here }

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concept check warnings
by s_j_turner <s_j_turner＠yahoo.co.uk> 02 Jan '03

02 Jan '03

FWIW, I just started looking at Jeremy Siek's concept checking tools, and my compiler(*) came up with a warning about name hiding which is trivial to fix. I was using ContainerConcept, and it uses a method argument with the same name as a data member. The fix looks like: *** concept_check.hpp Fri Dec 27 16:51:51 2002 --- concept_check.hpp Thu Jan 2 16:13:03 2003 *************** *** 708,719 **** function_requires< AssignableConcept<Container> >(); const_constraints(c); } ! void const_constraints(const Container& c) { ! i = c.begin(); ! i = c.end(); ! n = c.size(); ! n = c.max_size(); ! b = c.empty(); } Container c; bool b; --- 708,719 ---- function_requires< AssignableConcept<Container> >(); const_constraints(c); } ! void const_constraints(const Container& cc) { ! i = cc.begin(); ! i = cc.end(); ! n = cc.size(); ! n = cc.max_size(); ! b = cc.empty(); } Container c; bool b; There are a few other classes in there which do the same thing, but this is the only one I'm currently using. --- (*) Sun Forte 6.2.1

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RE: [Boost-Users] Re: Simple boost program throws exception
by Tom Matelich 02 Jan '03

02 Jan '03

I don't have too much advice except a) try the latest boost b) put a try/catch block around the code, figure out what function is calling and what exception is being thrown. > -----Original Message----- > From: ksaleh2 <ksaleh2(a)yahoo.com> [mailto:ksaleh2@yahoo.com] > Sent: Wednesday, January 01, 2003 9:21 AM > To: Boost-Users(a)yahoogroups.com > Subject: [Boost-Users] Re: Simple boost program throws exception > > > Hi, > > On December 7th I've posted this message, which unfortunately didn't > get any reply. I'm not a professional programmer, so forgive me if it > is a silly question, but your cooperation will help me understand > boost better, thank you and happy new year to all. > > --- In Boost-Users(a)yahoogroups.com, "ksaleh2 <ksaleh2@y...>" > <ksaleh2@y...> wrote: > > I'm trying boost for the first time on Codewarrior 8.0 for windows. > > The Boost version is 1.25.1 from the "Boost Graph Library" > > accompanying CD. The offensive code is : > > > > #include <boost/config.hpp> > > #include <iostream> > > > > #include <boost/graph/adjacency_list.hpp> > > > > using namespace boost; > > using namespace std; > > > > > > int main() > > { > > typedef adjacency_list<vecS,vecS,directedS, > > property < vertex_name_t, char > >,property<edge_weight_t,double> > > > Graph; > > > > property_map < Graph, vertex_name_t >::type name_map ; > > property_map < Graph, edge_weight_t >::type value_map ; > > > > Graph g; > > > > typename graph_traits<Graph>::vertex_descriptor a,b; > > > > a = add_vertex(g); name_map[a] = 'a'; > > b = add_vertex(g); name_map[b] = 'b'; > > > > typename graph_traits<Graph>::edge_descriptor ed; > > bool inserted; > > > > tie(ed, inserted) = add_edge(a, b, g); > > value_map[ed] = 1.2; > > > > > > return 0; > > } > > > > > > If the second template parameter for class VertexListS is replaced > > with listS it compiles and run normally. > > > > typedef adjacency_list<vecS,listS,directedS, > > property < vertex_name_t, char > >,property<edge_weight_t,double> > > > Graph; > > > > Can you please advise why? > > > > Best Regards > > > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Flexible Keyboard is the ideal accessory for PDA users that > are on the move. > http://us.click.yahoo.com/dCBVZC/WnCFAA/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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Error in testing tuple
by agiatojon <JonAgiato＠nyc.rr.com> 01 Jan '03

01 Jan '03

Happy Holidays to everyone! I am getting aquainted with the tuple class but am encountering the following error: c:\BGL\boost_1_29_0\boost\tuple\tuple_comparison.hpp(119): error C2027: use of undefined type 'boost::STATIC_ASSERTION_FAILURE<x>' with [ x=false ] with the following program: /** * tupleTest.cpp * Test of Boost library class tuple * A tuple is a fixed size collection of elements * Stored objects may be of different types * Current support of tuples with 0-10 objects * Objects may be any valid C++ type except void and function types * Jon Agiato * 12-23-02 */ #include <iostream> using std::cout; using std::cin; using std::ostream; using std::cerr; #include <cstdlib> #include <boost/tuple/tuple.hpp> using boost::tuple; // both tuple_io.hpp and tuple_comparison.hpp include tuple.hpp // tuple_io must be included for tuple input and output operators #include <boost/tuple/tuple_io.hpp> // tuple_comparison.hpp must be included for comparison operators #include <boost/tuple/tuple_comparison.hpp> #include <string> using std::string; #include <exception> using std::exception; class A { friend ostream &operator<<(ostream &output, const A &a) { output << a.S; return output; } public: A(string s = "Testing"):S(s) {;} string S; }; class B { friend ostream &operator<<(ostream &output, const B &b) { output << b.D; return output; } public: B(double d = 3.501):D(d) {;} double D; }; class C { friend ostream &operator<<(ostream &output, const C &c) { output << c.state; return output; } public: C(bool st = true):state(st) {;} double state; }; int main() { try { tuple<A, B, C> testTuple; cout << testTuple << '\n'; tuple<B, A> test2Tuple; if(testTuple == test2Tuple) cout << testTuple << " is equal to " << test2Tuple << '\n'; else cout << testTuple << " is not equal to " << test2Tuple << '\n'; cout << "Press enter to exit..."; cin.get(); return EXIT_SUCCESS; } catch(const exception &E) { cerr << "Standard library exception: " << E.what() << '\n'; return EXIT_FAILURE; } catch(...) { cerr << "Unknown exception thrown.\n"; return EXIT_FAILURE; } } I am using Visual Studio.NET Enterprise Architect Thanks! Jon Agiato JonAgiato(a)nyc.rr.com

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Simple boost program throws exception
by ksaleh2 <ksaleh2＠yahoo.com> 01 Jan '03

01 Jan '03

I'm trying boost for the first time on Codewarrior 8.0 for windows. The Boost version is 1.25.1 from the "Boost Graph Library" accompanying CD. The offensive code is : #include <boost/config.hpp> #include <iostream> #include <boost/graph/adjacency_list.hpp> using namespace boost; using namespace std; int main() { typedef adjacency_list<vecS,vecS,directedS, property < vertex_name_t, char >,property<edge_weight_t,double> > Graph; property_map < Graph, vertex_name_t >::type name_map ; property_map < Graph, edge_weight_t >::type value_map ; Graph g; typename graph_traits<Graph>::vertex_descriptor a,b; a = add_vertex(g); name_map[a] = 'a'; b = add_vertex(g); name_map[b] = 'b'; typename graph_traits<Graph>::edge_descriptor ed; bool inserted; tie(ed, inserted) = add_edge(a, b, g); value_map[ed] = 1.2; return 0; } If the second template parameter for class VertexListS is replaced with listS it compiles and run normally. typedef adjacency_list<vecS,listS,directedS, property < vertex_name_t, char >,property<edge_weight_t,double> > Graph; Can you please advise why? Best Regards

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Success stories
by Miki_Tebeka＠amat.com 01 Jan '03

01 Jan '03

Hello All, I'm trying to convince my boss to use boost. Any helpful success stories/big users/anything that can help? 10x. Bye. ----------------------------------------------------------------------------- Smile, damn it, smile. lambda msg: { 'name' : 'Miki Tebeka', 'email' : 'miki_tebeka(a)amat.com', 'url' : 'http://www.cs.bgu.ac.il/~tebeka', 'quote' : 'The only difference between children and adults is the price of the toys' }[msg]

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