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[BGL] Property map question
by Chris Russell 16 Sep '02

16 Sep '02

What determines when boost::get(Graph, vertex_myproperty_t) returns a boost::property_map<graph_t, vertex_myproperty>::type vs. a ::const_type? Suppose: enum vertex_myproperty_t { vertex_myproperty = 12345}; BOOST_INSTALL_PROPERTY(vertex,myproperty); typedef property<vertex_myproperty_t, MyPropertyObject, ....> vertex_properties_t; typedef adjacency_list<vecS,vecS,bidirectionalS, vertex_properties_t> graph_t; typedef property_map<graph_t, vertex_myproperty_t>::type vertex_myproperty_map_t; graph_t Graph;

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Re: Thanks for the help...
by Peter Dimov 16 Sep '02

16 Sep '02

From: "someuserat" <marktutt(a)excite.com> > > If I can impose, I've got another question that I think is in the same > area... > > I couldn't think of a way to call Widget::operator()(const WidgetPtr > w) through the smart pointer, so I wrote an equivalent method called > equals to try to imlement the following function. > > void WidgetMgr::dropWidget(const WidgetPtr w){ > > col.erase(remove_if(col.begin(),col.end(),boost::b > ind2nd(boost::mem_fn(&Widget::equals),c))); > } ... where Widget::equals takes a WidgetPtr? Based on this information, I think that you need boost::bind(&Widget::equals, _1, w) (Please use the boost-users list.) > Is there any reference to the boost libraries that goes into more > detail? I've got several books on STL that never seem to address the > issues I'm running into with smart pointers, I'm afraid what I may run > into once I really get into the meat of this project.

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RE: [Boost-Users] lexical_cast question
by Björn Karlsson 16 Sep '02

16 Sep '02

> From: Mark Snelling [mailto:mark@bakedbeans.com] > > Ok, I guess I'll just make my own temporary one based on the > original in > the meantime :) > > Mark. > Or, you could use the version with proposed changes - it's in the Files section at YahooGroups. Bjorn

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RE: [Boost-Users] lexical_cast question
by Björn Karlsson 16 Sep '02

16 Sep '02

> From: Mark Snelling [mailto:mark@bakedbeans.com] > > Hi, > Does the boost::lexical_cast library support wide character sets for > example: > > #include <boost/lexical_cast.hpp> > > using namespace boost; > using namespace std; > > void main () > { > wstring wtext(L"1234"); > int val = lexical_cast<int>(wtext); > } > Not the current version of lexical_cast - the implementation uses stringstream to perform the conversion. A proposed change to lexical_cast does handle wide characters correctly. I'm not sure about the status of that proposal, though. Bjorn Karlsson

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lexical_cast question
by Mark Snelling 16 Sep '02

16 Sep '02

Hi, Does the boost::lexical_cast library support wide character sets for example: #include <boost/lexical_cast.hpp> using namespace boost; using namespace std; void main () { wstring wtext(L"1234"); int val = lexical_cast<int>(wtext); }

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How to build boost threads library on AIX 4.3.3 with VisualAge 5
by robertpsather 16 Sep '02

16 Sep '02

Building Boost on AIX is difficult. Here's a recipe that worked for me, for building on the following platform: Boost source download version 28 AIX 4.3.3 on RS/6000 VisualAge 5.0 Jam: downloaded binary of Boost.Jam Version 3.1.0. OS=AIX. bash shell Building Boost Setup: Downloaded version 28 tar.gz file to ~/boost. Un-gzipped and untarred. Set export BOOST_ROOT=/home/satherb/boost/boost_1_28_0 Attempt: jam "-sTOOLS=vacpp" Result: Many compilation errors, in building of regexp library. For example: Error: "libs/regex/build/../src/cpp_regex_traits.cpp", line 196.39: 1540-0257 (S) An object or reference of type "std::messages_base::catalog" cannot be initialized with an expression of type "int". Attempt: in cpp_regex_traits.cpp", line 196, changed "-1" to "(size_t) 1" Result: compiler says "cannot be initialised with type unsigned long." for the same line. Attempt: Noted that www.boost.org says that threads lib does not depend on regex or python. Edited Jamfile to comment out unnecessary targets python and regex. Result: Most errors are "Thread support is unavailable". Looking at source indicates this is because BOOST_HAS_THREADS macro is undefined. Attempt: export BOOST_HAS_THREADS=1 Result: same errors. Attempt: run ./configure Result: configure gives error message that says "compiler does not produce output" (or something like that) However, running configure again worked! Here were the recent settings of environmental variables: export BOOST_ROOT=/home/satherb/boost/boost_1_28_0 export _MT=1 export CC=xlC_r export CXX=xlC export _POSIX_THREADS=1 export LIBS=-lpthread (I don't know which of these was the key. If you discover the answer, please let me know.) Attempt: Did as configure suggested: "Adjustments to boost configuration have been written to user.hpp, copy this to boost/config/user.hpp to use "as is" " Result: jam still gives "Thread support is unavailable" errors. Attempt: added a line to boost/config/user.hpp: #define BOOST_HAS_THREADS Result: builds! (Don't know yet if it works properly, of course. The examples don't build.) Bob Sather bob.sather(a)lloydstsb.delete_this_part.co.uk

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graph vertices / IRIX / GCC
by yg-boost-users＠m.gmane.org 16 Sep '02

16 Sep '02

Hello, Q: one can construct a graph using adjacency_list<> and then immediately iterate over the vertices, right? The program below writes out the numbers 0 to 9 when compiled using gcc 3.2 on linux. Ditto on my IRIX system, *unless* I try to optimize. I expect this is a GCC optimizer bug, but I just want to be sure I haven't overlooked something in the boost docs. Thanks, -S #include <iostream> #include <boost/graph/graph_traits.hpp> #include <boost/graph/adjacency_list.hpp> typedef boost::adjacency_list< boost::vecS, boost::vecS, boost::undirectedS, boost::no_property, boost::property<boost::edge_weight_t,float> > Graph; typedef boost::graph_traits<Graph>::vertex_descriptor vertex_descriptor; typedef boost::graph_traits<Graph>::edge_descriptor edge_descriptor; int main() { Graph g( 10 ); boost::graph_traits<Graph>::vertex_iterator ui, ui_end; for (boost::tie(ui, ui_end) = boost::vertices(g); ui != ui_end; ++ui) { std::cout << "*ui = " << *ui << std::endl; } return 0; }

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graph vertices / IRIX / GCC
by Steve M. Robbins 16 Sep '02

16 Sep '02

Hello, Q: one can construct a graph using adjacency_list<>(N) and then immediately iterate over the vertices, right? The program below writes out the numbers 0 to 9 when compiled using gcc 3.2 on linux. Ditto on my IRIX system, *unless* I try to optimize. I expect this is a GCC optimizer bug, but I just want to be sure I haven't overlooked something in the boost docs. Thanks, -S #include <iostream> #include <boost/graph/graph_traits.hpp> #include <boost/graph/adjacency_list.hpp> typedef boost::adjacency_list< boost::vecS, boost::vecS, boost::undirectedS, boost::no_property, boost::property<boost::edge_weight_t,float> > Graph; int main() { Graph g( 10 ); boost::graph_traits<Graph>::vertex_iterator ui, ui_end; for (boost::tie(ui, ui_end) = boost::vertices(g); ui != ui_end; ++ui) { std::cout << "*ui = " << *ui << std::endl; } return 0; }

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ASCII Code Problem.. Please Help me.
by Sean Lee 15 Sep '02

15 Sep '02

I am currently trying to use Regex++ and I almost got there. However, I try to use Regex++ with XML parser and I got some problem. Here is the xml expression. <subtree name="itinerary" regex="(<\\s*TR\\s*VALIGN=TOP>\\s*<TD\\s*WIDTH=250>\\s*<\\s*B \\s*>[^>]+AM</B>?)"> Since "<" and ">" are not valid in XML Syntax, I have to use "<" and ">". I have loaded the xml file in my program and did following thing. char* regex=NULL; _bstr_t strRegex; strRegex=pIXMLDOMNode->text; // regex="(<\\s*TR\\s*VALIGN=TOP>\\s*<TD\\s*WIDTH=250>\\s*<\\s*B \\s*> //[^>]+AM</B>?)"> regex = (char*)malloc(_bstr_t(strRegex).length()); lstrcpy(regex,strRegex); AfxMessageBox(regex); // got the same string. But when I compared with following string and I got "FALSE". char* temp="(<\\s*TR\\s*VALIGN=TOP>\\s*<TD\\s*WIDTH=250>\\s*<\\s*B\\s*>[^>]+AM</B> ?)"; if(lstrcmp(temp,regex)==0) Please help me. Thank you very much. Sean Lee slee(a)qixo.com

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tokenizer bug? core dump
by wugui 14 Sep '02

14 Sep '02

\\n ok, \\r\\n core dump what happend? { const string test_string = "\"message ; \\r\\n message\" \"quote \\\"\" 'escape \\\\'"; typedef tokenizer<escaped_list_separator<char> > Tok; escaped_list_separator<char> sep("\\"," ;","\"\'"); Tok tok(test_string, sep); for(Tok::iterator beg=tok.begin(); beg!=tok.end();++beg) cout << "[" << *beg << "]" << endl; } (gdb) bt #0 0x281047b4 in kill () from /usr/lib/libc.so.4 #1 0x28144b26 in abort () from /usr/lib/libc.so.4 #2 0x28097444 in __terminate () from /usr/lib/libstdc++.so.3 #3 0x28097461 in __terminate () from /usr/lib/libstdc++.so.3 #4 0x280977fb in __sjthrow () from /usr/lib/libstdc++.so.3 #5 0x804c5ea in boost::iterator_adaptor<boost::detail::token_iterator_base<char const *>, boost::detail::tokenizer_policy<basic_string<char, string_char_traits<char>, __default_alloc_template<false, 0> >, boost::escaped_list_separator<char, string_char_traits<char> > >, basic_string<char, string_char_traits<char>, __default_alloc_template<false, 0> >, basic_string<char, string_char_traits<char>, __default_alloc_template<false, 0> > const &, basic_string<char, string_char_traits<char>, __default_alloc_template<false, 0> > const *, forward_iterator_tag, int>::iterator_adaptor () #6 0x804bdd9 in boost::tokenizer<boost::escaped_list_separator<char, string_char_traits<char> >, char const *, basic_string<char, string_char_traits<char>, __default_alloc_template<false, 0> > >::begin () #7 0x804a64f in main () #8 0x804a4b5 in _start ()

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