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boost::bind problem
by Mark Snelling 29 Oct '02

29 Oct '02

Hello, I was wondering if anyone out there in Boost land could give me a hand here? Here's the problem: I have a class A: class A { public: A(int i) : _priority(i) {} int priority() {return _priority;} private: int _priority; }; What I want to do is create a std::priority_queue based on boost::shared_ptr<A> and use boost::bind/compose to create the sorting function required by std::priority_queue. However, when I try and typedef the queue (to save a lot of typing) I get compiler errors on VS.NET. using namespace std; using namespace boost; typedef priority_queue<shared_ptr<Functor>, vector<shared_ptr<Functor> >, bind(less<int(), bind(&Functor::priority, _1), bind(&Functor::priority, _2))> MyQueue; Am I going about this the right way? Any help appreciated. TIA Mark.

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Graph library: parallel edges
by Juerg Tschirren 29 Oct '02

29 Oct '02

With the Boost Graph Library, I try do create an undirected graph that does not allow parallel edges, so far without success. Does anybody have a small example that shows how to do this? Juerg

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Graph library: vertex type
by Juerg Tschirren 29 Oct '02

29 Oct '02

In the Boost Graph Library, is it possible to have a custom-defined type for vertices, e.g., I would like to have boost::graph_traits<Graph>::vertex_descriptor map to std::pair<int,int> Can this be done? If yes, how? Juerg

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Re: [Boost-Users] MSVCNT not used anymore?
by dick.bridges＠tais.com 28 Oct '02

28 Oct '02

Thanks! That worked. The MSVCNT example on http://www.boost.org/tools/build/build_system.htm must be left over from a previous version. Appreciate the quick response. sashan <sashang(a)ihug.co To: Boost-Users(a)yahoogroups.com .nz> cc: Subject: Re: [Boost-Users] MSVCNT not used anymore? 10/29/2002 04:20 AM Please respond to Boost-Users dick.bridges(a)tais.com wrote: >I'm having a senior moment. > >MSVCNT is set to C:\Program Files\Microsoft Visual Studio\VC98 and bjam is >invoked with "-sTOOLS=msvc" but the command line that gets invoked is C: >\Program Files\Microsoft Visual C++\VC98\bin\cl and, of course I get: "The >system cannot find the file specified." > >Where's the instructions for compiling with VC6, SP4? > > This is my command line (saved in a batch file): bjam -sTOOLS=msvc -sBUILD=release -sMSVC_ROOT=D:\msvs\VC98 -sVISUALC=D:\msvs\VC98 I don't think MSVCNT is used see http://www.boost.org/tools/build/msvc-tools.html -- P: Egad! You astound me, Brain! B: That's a simple task, Pinky. 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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MSVCNT not used anymore?
by dick.bridges＠tais.com 28 Oct '02

28 Oct '02

I'm having a senior moment. MSVCNT is set to C:\Program Files\Microsoft Visual Studio\VC98 and bjam is invoked with "-sTOOLS=msvc" but the command line that gets invoked is C: \Program Files\Microsoft Visual C++\VC98\bin\cl and, of course I get: "The system cannot find the file specified." Where's the instructions for compiling with VC6, SP4?

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are examples on maual page ready to run?
by J-S Lin 28 Oct '02

28 Oct '02

The error message is as follows, --------------------------------- g:\C++ notes\test_boost\test_matrix.cpp(14) : error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'boost::numeric::ublas::matrix' (or there is no acceptable conversion) with [ T=double, F=boost::numeric::ublas::row_major, A=boost::numeric::ublas::unbounded_array ] ------------------------------ Much appreciated. J-S Lin

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lexical_cast fails to convert std::string to boost::dynamic_bitset<>
by Klaus Nowikow 28 Oct '02

28 Oct '02

Hi! I am trying to convert a string to a boost::dynamic_bitset using boost::lexical_cast, as in this example: template <class Value> bool GetValue(const std::string& str, Value& val) { try { val = boost::lexical_cast<Value>(str); } catch(boost::bad_lexical_cast&) { return false; } return true; } int main() { std::string str = "01"; boost::dynamic_bitset<> bits; if(!GetValue(str, bits)) { [...] } } The lexical_cast always throws an exception. The problem seems to be in lexical_cast.hpp, where a temporary object is created: Target result; if(!(interpreter << arg) || !(interpreter >> result) || !(interpreter >> std::ws).eof()) throw bad_lexical_cast(); and in dynamic_bitset.hpp, where operator>>(std::basic_istream<CharT, Traits>&, dynamic_bitset<Block, Allocator>&) iterates over the bitset using the size() (which is, of course, 0). I sure could solve my particular problem by providing an explicit template instantiation of the GetValue() function, but I don't want to do this because the code is for a library, and I want to reduce references to other libraries to an absolute minimum. Did I miss something here, or is there a workaround for this problem? Regards, Klaus

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Date_Time undefined reference
by David Clark 27 Oct '02

27 Oct '02

Hi, I am having a problem compiling the following example #include "boost/date_time/gregorian/gregorian.hpp" #include "boost/date_time/date_parsing.hpp" #include <iostream> #include <string> int main() { using namespace boost::gregorian; std::string s("2002-10-15"); date d(from_string(s)); std::cout << to_simple_string(d) << std::endl; return 0; }; The linker is complaining about an undefined reference to boost::gregorian::greg_month::as_short_string() const and boost::gregorian::greg_month::as_long_string() const using g++ 3.0.4 g++ test.cpp -o test -DDATE_TIME_INLINE Seems the problem is in the call to to_simple_string(d) Is there something obvious I'm missing here. Thanks David.

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Unexpected result in parsing a regular expression
by abhinkar 27 Oct '02

27 Oct '02

Hi, I recently downloaded the boost regex library and am trying to use the search and replace (regex_merge) API. But I am not getting the expected result. Here is what I am trying to do. I am trying to replace a single quoted string with something. But, the catch here is that the string in single quotes can have zero or many 2 consecutive single quotes. For example: Input (Ignore the angle brackets>: <foo='string with '' consecutive '' single ''quotes' bar='string with no single quotes'> To be replaced by 'XXX'. So the output that I want: <foo=XXX bar=XXX> Here is the regular expression that I wrote in Perl: /(\'[^']*(\'\')*[^']*\')/ I get the expected result in Perl. So, to test this with regex library I wrote a sample program to use the regex_merge API and try the replace functionality. ---------------------------replace.cc-------------------------------- #include <boost/regex.hpp> #include <string> #include <iostream> #include <sstream> #include <iterator> using namespace std; using namespace boost; const std::string formatstr("XXX"); std::string processexp(string resp) { regex expression("(\'[^']*(\'\')*[^']*\')"); std::string result; std::ostringstream t; std::ostream_iterator<char, char> oi(t); cout << "Response:" << resp << endl; result = boost::regex_merge(resp, expression, formatstr, boost::format_all); return result; } int main(int argc) { std::string res; res = processexp("foo='string with '' consecutive '' single ''quotes' bar='string with no single quotes'"); cout << "results=" << res << endl; return 0; } --------------------------------------------------------------------- The output I get is: foo=REPLACEDREPLACED bar=REPLACED I tried several ways, but couldn't get the regular expression to work to return the expected result. I WOULD really appreciate if someone could help me. Thanks in advance, Sameer

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vecS versus listS
by aaronyinyong 27 Oct '02

27 Oct '02

compare the following codes: 1.First I create Graph using vecS parameter: typedef boost::adjacency_list<vecS,vecS,directedS,VertexProperty,EdgeProperty> Graph; ..... E edge_array[num_edges]={E(0,1),E(0,2),E(0,3),E(2,3)}; boost::add_edge(edge_array[i].first,edge_array[i].second,g); ..... This is OK! 2.Then I changed the parameter "vecS" to "listS". typedef boost::adjacency_list<listS,listS,directedS,VertexProperty,EdgePropert y> Graph; ..... E edge_array[num_edges]={E(0,1),E(0,2),E(0,3),E(2,3)}; boost::add_edge(edge_array[i].first,edge_array[i].second,g); It can't be compiled.The VC7 tells me "int can't be converted to void*". So what's wrong? Is there any difference which could be caused by "vecS" and "listS"?

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