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[asio]Winsock.h
by Robert Jones 13 Jul '09

13 Jul '09

What's the deal with Winsock.h & Asio? I can see there's been chatter on this topic before, but not what the result is. Thanks, Rob.

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[Pool] Overhead in using singleton_pool?
by Julius Ziegler 13 Jul '09

13 Jul '09

Hello list, I would like to know if there is any overhead in using singleton_pool instead of a simple pool object. Especially, I guess there could be some overhead due to synchronisation, as the singleton interface is guaranteed to be thread safe. I currently have some trouble with deallocation order of statics at program exit (I am using a static pool object), but everything works fine when I use singleton_pool instead. Are there any disadvantages (runtime) when using singleton_pool? Thanks! Julius

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Re: [Boost-users] [Program Options] Difficulty compiling for static runtime library
by Lindley M French 13 Jul '09

13 Jul '09

> Lindley M French wrote: > > I have a large project that I'd like to use Boost.Program > Options with. Most of the other Visual Studio 2005 projects are > set to link against "Multithreaded" or "Multithreaded Debug" > rather than the DLL variants of same; so of course, I need to > build Program Options accordingly. > > > > I tried this: > > bjam.exe" release --runtime-link=static program_options > > > > But that did not produce the library that VS wants, which is: > > > > libboost_program_options-vc80-mt-s-1_39.lib > > > > Try > bjam release runtime-link=static --with-program_options > > In Christ, > Steven Watanabe I tried that, it produced the following output: bjam.exe release --runtime-link=static --with-program_options WARNING: No python installation configured and autoconfiguration failed. See http://www.boost.org/libs/python/doc/building.html for configuration instructions or pass --without-python to suppress this message and silently skip all Boost.Python targets warning: No toolsets are configured. warning: Configuring default toolset "msvc". warning: If the default is wrong, your build may not work correctly. warning: Use the "toolset=xxxxx" option to override our guess. warning: For more configuration options, please consult warning: http://boost.org/boost-build2/doc/html/bbv2/advanced/configuration.html Building C++ Boost. After the build, the headers will be located at C:\Documents and Settings\lfrench\Desktop\MADCAT\atg-madcat-dev\im_nav\projects\madcat\third-party-software\boost_1_39_0 The libraries will be located at C:\Documents and Settings\lfrench\Desktop\MADCAT\atg-madcat-dev\im_nav\projects\madcat\third-party-software\boost_1_39_0\stage\lib Use 'bjam install --prefix=<path>' if you wish to install headers and libraries to a different location and remove the source tree. ...patience... ...found 523 targets... ...updating 15 targets... common.mkdir bin.v2\libs\program_options\build\msvc-8.0\release\link-static common.mkdir bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\cmdline.obj cmdline.cpp libs\program_options\src\cmdline.cpp(272) : warning C4800: 'int' : forcing value to bool 'true' or 'false' (performance warning) compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\config_file.obj config_file.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\options_description.obj options_description.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\parsers.obj parsers.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\variables_map.obj variables_map.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\value_semantic.obj value_semantic.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\positional_options.obj positional_options.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\utf8_codecvt_facet.obj utf8_codecvt_facet.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\convert.obj convert.cpp compile-c-c++ bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\winmain.obj winmain.cpp msvc.archive bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\libboost_program_options-vc80-mt-1_39.lib common.copy stage\lib\libboost_program_options-vc80-mt-1_39.lib bin.v2\libs\program_options\build\msvc-8.0\release\link-static\threading-multi\libboost_program_options-vc80-mt-1_39.lib 1 file(s) copied. ln-NT stage\lib\libboost_program_options-vc80-mt.lib "NT symlinks not supported yet, making copy" 1 file(s) copied. ...updated 15 targets... It doesn't appear to be using the correct filename.

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boost autolinkig issue - library names on vc9?
by Maróy Ákos 13 Jul '09

13 Jul '09

Hi, I'm having an issue with boost autolinking on Visual Studio 9 (2008), with the boost-pything library. the boost build process generates libraries of the name: libboost_XXX-vc90-mt-gd-1_39.lib and the like, but interestingly autolinkig fails with the following message: 1>LINK : fatal error LNK1104: cannot open file 'boost_python-vc90-mt-gd-1_39.lib' am I doing something wrong? Akos

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Linking to release libs in debug build
by John Krajewski 13 Jul '09

13 Jul '09

I've noticed my boost libs are slowing my game down incredibly in my debug builds. I'd like to link to release boost libs even in Debug, is that possible and will it cause any problems? Secondly, I'm not sure how to do this. Boost is somehow auto-linking to the correct lib for my build (I've downloaded the libs precompiled for visual studio). Does anyone know how this auto-linking process works and how I can override it to link to release libs instead of debug? Thanks! -John

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how to link libraries in Jamroot?
by Arne Kalaghan 13 Jul '09

13 Jul '09

Hello, I am not very experienced with boost. I try to learn how to use the boost.thread library. After early bjam compilation errors (undefined references, because the boost_thread library was not linked), I found that this Jamroot creates my executable successfully: exe threadtest : threadtest.cpp : <library>/usr/lib/libboost_thread-gcc42-mt-1_34_1.so.1.34.1 ; Is it possible to simplify the <library> parameter to something like "boost_thread"? The reason is that I am developing on different systems with different boost versions, so that I don't want to hardcode the library version in the Jamroot. I thought that the boost.build system should be smart enough that it finds the appropriate library file if you only tell it "use the thread library please". How can I make the Jamroot independent from the boost installation and, more importantly, from the operation system? Best wishes, A. Kalaghan

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[array] GCC 4.2 warnings with array initialization
by Allen Cronce 13 Jul '09

13 Jul '09

Hi all, When building with boost 1.36 and GCC 4.2 under Xcode, the following code produces a warning: boost::array<int, 2> warningArray = { 1, 2 }; warning: missing braces around initializer for 'int [2]' We see no warnings with GCG 4.0. We have a zero warning tolerance. All warnings are counted as errors. The boost::array documentation indicates that the single brace approach should work for conforming compilers, according to 8.5.1 (11) of the Standard. So does that mean that GCC 4.2 is non-conforming? Sure enough, when I change the code to include a second set of braces, the warning is gone: boost::array<int, 2> noWarningArray = { { 1, 2 } }; But this is a problem as we move to GCC 4.2 because a) we use initialized arrays all over the place, so this means a lot of little changes, and b) requiring an extra set of braces is counter intuitive and irritating at best. I don't like the idea of making the above code changes, and I don't want to globally disable the warning because it might be useful for other code. Does anyone have a better solution? Thanks in advance for any suggestions. Best, -- Allen Cronce

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Why can I not put a break in this part of asio sample code?
by Ozgur Ozturk 13 Jul '09

13 Jul '09

Hi, I am using the async_tcp_echo_server.cpp<http://www.boost.org/doc/libs/1_39_0/doc/html/boost_asio/example/echo/async…>sample code to understand asio. when I am tracing code in visual studio, it doeasn't let me put a breakpoint inside start() function in session class. Will it be run in another thread? is that the reason for not being able to put a breakpoint? Though it seems I can put breakpints for other codes that run in other threads... Why can I not put here? I tried to break at the point calling this function and step into from there. it jumps to async_receive(...) function in win_iocp_socket_service.hpp file. Could someone help me understand what is going on, or give me some pointers about how to trace such code? TIA, Ozgur PS: here is the related code: class session { //... //this is the part I can not put breakpoint. void start() { socket_.async_read_some(boost::asio::buffer(data_, max_length), boost::bind(&session::handle_read, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } Best regards, Ozgur (Oscar) Ozturk www.DrOzgur.com +1 (614) 805-4370

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[thread] thread specific variable instead of thread specific pointer?
by Frédéric Bron 13 Jul '09

13 Jul '09

I would like to have a variable specific to each thread. This means I would like to use the same variable name and that this name corresponds to different instances in different threads. For example, I would like to build a log stream that writes in different files in different threads. For example I would like to have a variable "flog" that behaves like a std::ostream: flog << "hello world!" ; I have found the two following solutions based on the use of boost::thread_specific_ptr but I am not fully satisfied with them: boost::thread_specific_ptr<std::ofstream> flogs ; // first solution using a function std::ostream &flog() { return *flogs.get() ; } // but I then have to add () after flog: flog() << "hello world!" ; // second solution using a macro #define flog flog() // but macros are not very recommended in C++. Any other idea that would allow me to write flog << "hello world!" like with std::cout? Note that I also tried to write a class derived from ostream with only one instance flog. This class had a special stream buffer using a thread specific pointer. However, the flog instance stores some informations like the precision of real numbers (flog << setprecision(10) for example) and the output of one thread can then interfere with the output of other threads... Regards, Frédéric

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Some of Boost Regex++ not recognized
by lsimons 13 Jul '09

13 Jul '09

<hoping this isn't a double post. Had some trouble with connection first time> I really appreciate the work done on the Boost libraries. I've used them in other projects and it's always been a welcome relief. For my current project, I'm trying to use the Boost Regex++ library in MSVC++ 6.0 (under Vista) to do some basic regex. I've installed the libraries as per the tutorial and added the Boost path to my compiler and linker includes. A lost of the basic functionality works fine, but I'm having trouble with autocompletion. The bigger issue is that certain parts of the library seem to throw the compiler. Ex that comiples fine: #include "stdafx.h" #include <boost/regex.hpp> #include <string.h> using namespace std; using namespace boost; int main(int argc, char* argv[]) { regex expr("^&[a-zA-Z0-9_ ]+,\\s+[a-zA-Z0-9_ ]+,\\s+[0-9].+"); string text = "&AirSpeed_Error, tla_error, 2 \\test stuff"; bool result; result = regex_match(text,expr); if (result == true) cout << "Match" << endl; else cout << "No Match" << endl; return 0; } If I add the line "match_flag_type flags = match_default;" I receive three errors: C:\Users\me\Documents\test\test.cpp(30) : error C2065: 'match_flag_type' : undeclared identifier C:\Users\me\Documents\test\test.cpp(30) : error C2146: syntax error : missing ';' before identifier 'flags' C:\Users\me\Documents\test\test.cpp(30) : error C2065: 'flags' : undeclared identifier Error executing cl.exe. I think I might simply have something misconfigured in MSVC6, and I would appreciate any comments or suggestions towards resolving the issue. Please let me know if there's any additional info I can provide. Thanks, Louis -- View this message in context: http://www.nabble.com/Some-of-Boost-Regex%2B%2B-not-recognized-tp24219036p2… Sent from the Boost - Users mailing list archive at Nabble.com.

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[filesystem] Extracting a relative path.
by Robert Jones 13 Jul '09

13 Jul '09

Hi All I'm trying to understand how to determine the relative path of one absolute path to another. So, c:\a\b\c.d relative to c:\a and I'd like the answer to be b\c.d I thought this would be easy to do, but I can't see how. Any thoughts? Thanks, Rob.

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[Tuple] What's the point?
by Robert Jones 13 Jul '09

13 Jul '09

I know that sounds like a slightly flippant question, but I really don't get it. I've used tuples a few times, always for the multiple return value behaviour using tie( ), but in the end it always seems to be a better solution to use a struct. Code like t.get<1>( ) = "fred"; is a bit non-obvious, compared to t.forename = "fred"; So have I entirely missed the point of tuples? Thanks, Rob.

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understanding placeholders
by Ozgur Ozturk 13 Jul '09

13 Jul '09

Hi, I see in the code some functions are passed things like boost::asio::placeholders::bytes_transferred. But I didn't understand what is going on, what are their aim? I found they are defined in placeholders.hpp as boost::arg<2>& bytes_transferred = boost::asio::placeholders::detail::placeholder<2>::get(); //and the get function as template <int Number> struct placeholder { static boost::arg<Number>& get() { static boost::arg<Number> result; return result; } }; TIA, Best regards, Ozgur (Oscar) Ozturk www.DrOzgur.com +1 (614) 805-4370

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Deadline_timer problem
by Mario Chacon 13 Jul '09

13 Jul '09

Hello: I have a problem using boost deadline timer that I cannot resolve. Why the resume method do not call again to the handler method??? Do I have something wrong? class TimerCallback { public: virtual void OnTimer()=0; }; class Timer : boost::noncopyable { public: Timer(unsigned long timeOutMilliSeconds, TimerCallback* callbac) : m_scheduler(), m_timer(m_scheduler), m_timerThread(), m_callbac(callbac), m_timeOutMilliSeconds(timeOutMilliSeconds) { }; virtual ~Timer() { m_scheduler.stop(); m_timerThread->join(); }; void some_operation() { //m_scheduler.post(boost::bind(m_callbac->OnTimer(), this)); m_callbac->OnTimer(); }; void handler(const boost::system::error_code& error) { if (!error) { // Timer expired. m_callbac->OnTimer(); m_timer.expires_from_now(boost::posix_time::milliseconds(m_timeOutMilliSeconds)); // Start an asynchronous wait. m_timer.async_wait(boost::bind(&Timer::handler, this, boost::asio::placeholders::error)); } } void start() { // Set an expiry time relative to now. m_timer.expires_from_now(boost::posix_time::milliseconds(m_timeOutMilliSeconds)); // Start an asynchronous wait. m_timer.async_wait(boost::bind(&Timer::handler, this, boost::asio::placeholders::error)); m_timerThread.reset(new boost::thread(boost::bind(&boost::asio::io_service::run, &m_scheduler))); } void pause() { m_timer.cancel(); }; void resume() { m_timer.expires_from_now(boost::posix_time::milliseconds(m_timeOutMilliSeconds)); m_timer.async_wait(boost::bind(&Timer::handler, this, boost::asio::placeholders::error)); }; private: boost::asio::io_service m_scheduler; boost::asio::deadline_timer m_timer; boost::scoped_ptr<boost::thread> m_timerThread; TimerCallback* m_callbac; unsigned long m_timeOutMilliSeconds; }; Salu2.. masch...

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building boost libraries for cross-compiled project
by Steve Drake 13 Jul '09

13 Jul '09

I am trying to use boost (specifically the regex part) in a cross-compiled environment. The target is a single board computer running Linux on ARM. My development computer is a Windows 2000 machine. The cross compiler is a GNU C++ compiler that I got from the SBC vendor. It is located here: c:\TechnologicToolchain\devel-tools\crosstool-cygwin\bin\arm-unknown-linux-g nu-g++.exe When I build my ARM application program, by PATH on the PC is set to this: c:\TechnologicToolchain\devel-tools\crosstool-win\bin; \ c:\TechnologicToolchain\devel-tools\crosstool-cygwin\bin; \ c:\TechnologicToolchain\devel-tools\cygwin How do I build the boost libraries on my development PC so I can link them with my cross-compiled application code and run them on the ARM target? I am unfamiliar with bjam so I am having trouble figuring out how to configure it to use a specific compiler executable. Thanks in advance for any suggestions. Steve

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Boost Python is slow?
by Tyomich on the AIR 13 Jul '09

13 Jul '09

Hello everyone! I'm currently embedding Python and have a problem. I have a struct (point) which looks like struct TPoint { int x, y; }; And I want it to be usable from Python. I made it in two ways: the first one was writing all the warpping by myself according to Python/C API, and the second was wrap it with Boost.Python. So it looks like class_<TPoint>("TPoint") .def_readwrite("x", &TPoint::x) .def_readwrite("y", &TPoint::y); It wraps ok but here is a problem: I create a huge (1000000 items) list of objects of that type: def cr_fig(n): res = [] while n>0: res.append(TPoint()) n -= 1 return res And then when I use a simple function which just increments the x member of every object, this function takes about 4 seconds to process the whole list (1000000 items) of Boost-wrapped objects and less than a second to process objects of my own wrapping! How this can be possible? Is Boost.Python much more slower than Python itself? Regards, Artyom Chirkov. P.S. I couldn't find out how to write to Boost.Python community, so I wrote here. If anyone knows how to do that, please let me know!

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[Thread] Can't suppress thread_specific_ptr 'memory leak'
by Joshua Boyce 13 Jul '09

13 Jul '09

Hey all, having a small issue with thread_specific_ptr. I'm a MSVC user and I'm getting a memory leak reported with the leak detection from _CrtSetDbgFlag and I was wondering if it was possible to suppress it somehow? I only ask because I know that these leaks in particular are false positives (or so it seems) and I wish to filter them out so I can quickly see each time if anything else is leaking without having to "manually" filter the log myself. Thanks.

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Re: [Boost-users] A question on data change with lambda expression. Can any one with kindness help me?
by fmingu 13 Jul '09

13 Jul '09

Can any experts with kindness help me? I really need the answer. I have tried my best to program with c++. And I want to be familiar with lambda. Thanks a lot.

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[phoenix] how to compare std:string
by Michael Caisse 12 Jul '09

12 Jul '09

Hi all - I have a vector of std::pair< std::string, int > and I want to use std::find_if to get the location where the std::pair first is some string value. I have successfully performed the correct incantation to compare the std::pair second to an int; however, it eludes me to what I need for the string. This is my test ---------------------------------- #include <vector> #include <algorithm> #include <boost/spirit/home/phoenix/core.hpp> #include <boost/spirit/home/phoenix/operator.hpp> #include <boost/spirit/home/phoenix/bind/bind_member_variable.hpp> int main() { using namespace boost::phoenix; using namespace boost::phoenix::arg_names; typedef std::pair< std::string, int > node_type; typedef std::vector< node_type > node_storage_type; node_storage_type my_nodes; my_nodes.push_back( std::pair< std::string, int >( "foo", 8 ) ); // this works great node_storage_type::iterator iter = std::find_if( my_nodes.begin(), my_nodes.end(), bind( &node_type::second, arg1 ) == 8 ); // compilation error here: ..\..\..\library\vendor\boost_1_38_0\boost/spirit/home/phoenix/operator/comparison.hpp(27) : error C2678: binary '==' : no operator found which takes a left-hand operand of type 'std::basic_string<_Elem,_Traits,_Ax>' (or there is no acceptable conversion) // iter = std::find_if( my_nodes.begin(), my_nodes.end(), bind( &node_type::first, arg1 ) == "foo" ); return 0; } Thanks ! michael -- ---------------------------------- Michael Caisse Object Modeling Designs www.objectmodelingdesigns.com

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playing around with tutorial codes to understand ioservice
by Ozgur Ozturk 11 Jul '09

11 Jul '09

Hi, I have been working on asio from the online documentation for more than a week but I am still confused about the io_service. Especially about what happens when we pass io_service to so many other things (timer, socket, chat_client etc.)? I hoped playing around with the codes in tutorial may help me in understanding. I modified the code a bit from timer3.cpp example<http://www.boost.org/doc/libs/1_39_0/doc/html/boost_asio/tutorial/tuttimer3…>. (modified code is in attachment) When I add another io_service object, I was thinking one would run then the other one would start since in the comments of io_service.hpp it says * The run() function blocks until all work has finished and there are no * more handlers to be dispatched, or until the io_service has been stopped. but when I run two io_service objects io.run(); io2.run(); I get output from two of them interchangingly. (first print in each line is address of deadline timer, I added in print function to see which thread is running.) 0012FF04 0 0012FEE4 1 0012FEE4 2 0012FEE4 3 0012FF04 4 Could someone help me understand io_service class? (Maybe some pointers to old discussions could help.) I also read some papers about Proactor pattern, without too much help. Maybe example code can be supplied with more comments. I would also appreciate suggestions and pointers (probably in private emails to ozgur7 AT gmail com) to help me about implementing a simple command server (proxy). I am trying to implement a server to accept clients and run MySQL queries (example: look up name and password pair in a table) and pass results to clients. I am using connector/C++ for MySQL part, and that part seems very easy. However I am having difficulty in understanding asio. Do you think, I am overkilling for such a simple thing. (I thought it could pay back later when I needed to improve my program...) Thanks in advance, Best regards, Ozgur (Oscar) Ozturk www.DrOzgur.com +1 (614) 805-4370

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Binding operator <<
by Archie14 11 Jul '09

11 Jul '09

Can't figure out the proper sintax for binding <<. class A { public: friend std::ostream& operator << (std::ostream& stream, A& a); }; class B : boost::ptr_vector<A> { public: friend std::ostream& operator << (std::ostream& stream, B& b); } std::ostream& operator << (std::ostream& stream, B& b) { std::for_each(begin(), end(), boost::bind(&operator<<, ref(stream), ref(_1)); ??? return stream; }

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Re: [Boost-users] boost programmer_option.hpp
by Narendra R 11 Jul '09

11 Jul '09

hi Markus , Steeps i have done is 1. downloaded boost library boost_1_39_0 2. build the program.option using bootstrap.sh --without-libraries=program_options --libdir=/home/narendra/boost_instal/boost_1_39_0/b_lib_ins where /home/narendra/boost_instal is the directory where i have stored boost library I tried to link like this g++ -I /home/narendra/boost_instal/boost_1_39_0 test.cpp -o test -L /home/narendra/boost_instal/boost_1_39_0/stage/lib -l/home/narendra/boost_instal/boost_1_39_0/stage/lib/libboost_program_options-gcc41-mt-1_39.a

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[Program Options] Difficulty compiling for static runtime library
by Lindley M French 11 Jul '09

11 Jul '09

I have a large project that I'd like to use Boost.Program Options with. Most of the other Visual Studio 2005 projects are set to link against "Multithreaded" or "Multithreaded Debug" rather than the DLL variants of same; so of course, I need to build Program Options accordingly. I tried this: bjam.exe" release --runtime-link=static program_options But that did not produce the library that VS wants, which is: libboost_program_options-vc80-mt-s-1_39.lib Actually, that build setting caused program_options to throw a massive number of warnings, mostly stuff like: .\boost/program_options/detail/cmdline.hpp(128) : warning C4251: 'boost::program_options::detail::cmdline::m_style_parser' : class 'boost::function1 ,T0>' needs to have dll-interface to be used by clients of class 'boost::program_options::detail::cmdline' with [ R=std::vector<boost::program_options::option>, T0=std::vector<std::string> & ] and also .\boost/program_options/errors.hpp(21) : warning C4275: non dll-interface class 'std::logic_error' used as base for dll-interface class 'boost::prog m_options::error' C:\Program Files (x86)\Microsoft Visual Studio 8\VC\INCLUDE\stdexcept(22) : see declaration of 'std::logic_error' .\boost/program_options/errors.hpp(21) : see declaration of 'boost::program_options::error' Any ideas?

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re gularized gamma incomplete function (v 1.39)
by darthshak 10 Jul '09

10 Jul '09

I am using boost v1.39 libraries on Ubuntu 9.04. This is the first time I am using the boost libraries for some mathematical work. I needed to use the regularized incomplete gamma function for one of my programs. The documentation told me that gamma_q was the upper incomplete gamma function for the job. So I tried the syntax gamma_q(a,b) and I got an error saying "gamma_q was not declared in this scope". Realizing that the boost libraries were in /opt/boost, I compiled with the following : g++ ggpdf.cpp -I /opt/boost/include/boost-1_39/ I included the boost header with a #include<boost/math/special_functions/gamma.hpp>. I stil got the same error (gamma_q was not declared in scope). I then thought that I should link the libraries manually and then tried g++ ggcdf.cpp -I /opt/boost/include/boost-1_39/ -L /opt/boost/lib/ ...and still no luck. Also, the size of my /opt/boost folder is only 65M, which seems kind of small. Am I missing some incantation here for compiling or is it just an incomplete install? -- View this message in context: http://www.nabble.com/regularized-gamma-incomplete-function-%28v-1.39%29-tp… Sent from the Boost - Users mailing list archive at Nabble.com.

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newbie weighted edges question
by Fahad Saeed 10 Jul '09

10 Jul '09

Hello everyone, I am new at using Boost libraries and was hoping that someone could give me some pointers how to start.The problem that I want to solve is as follows: I want to build a directed graph model with edges that are weighted.But instead of having one weight each edge is suppose to have 2 weights, each representing a different parameter in my graph model.The weights are to be used separately for different functions. Also, this is trivial but a pointer would certainly help. I would like to take each vertice in the graph and ¨know¨ its immediate neighbours. Thanks in advance. Fahad

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