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mpl related question
by Istvan Buki 06 Aug '04

06 Aug '04

Hello mpl experts, I'm trying to initialize the elements of an array using rules defined in a list of structures. The code below illustrate what I'm trying to achieve. The problem I have with this code is that the First_Descriptor structure contain this index member that will be used to access the right item of the array. This is not nice because it force the writer of this structure to deal with implementation details. Is there a way to get rid of this index typedef in the *_Descriptor structures by using another construct from the mpl that would generate it ? // The array I need to initialize. Array_Item array[2]; struct Initializer { template < typename U > void operator()( mpl::identity< U > ) { // This is where array elements are initialized. // Note how the index member is used. array[U::index::type::value].some_method( U::a_param ) ; } } ; // This is one structure containing rules used to initialize array items. struct First_Descriptor { enum { a_param = 123456 } ; typedef mpl::int_< 0 > index ; } ; struct Second_Descriptor { enum { a_param = 2567 } ; typedef mpl::int_< 1 > index ; } ; // The list of structures containg rules to be applied during array // initialization. typedef mpl::list< First_Descriptor, Second_Descriptor > Descriptors ; // traverse the list and apply the rules. mpl::for_each< Descriptors, mpl::make_identity<_> >( Initializer( ) ) ; Thanks for any help you could provide. Istvan

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Error compiling REGEX under vc7.1 + stlport
by rflaperuta＠brq.com 06 Aug '04

06 Aug '04

People, this is one of the errors I got when compiling boost regex with vc7.1 + stlport: vc-Link bin\boost\libs\regex\build\boost_regex.dll\vc7.1-stlport\release\boost_regex-vc71-mt-p-1_31.dll bin\boost\libs\regex\build\boost_regex.dll\vc7.1-stlport\release\boost_regex-vc71-mt-p-1_31.lib Creating library bin\boost\libs\regex\build\boost_regex.dll\vc7.1-stlport\release\boost_regex-vc71-mt-p-1_31.lib and object bin\boost\libs\regex\build\boost_regex.dll\vc7.1-stlport\release\boost_regex-vc71-mt-p-1_31.exp winstances.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) regex.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) w32_regex_traits.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) wide_posix_api.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) instances.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) c_regex_traits.obj : error LNK2019: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) referenced in function "public: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::syntax_type(unsigned int)const " (?syntax_type@?$cpp_regex_traits@_W@boost@@QBIII@Z) c_regex_traits_common.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) cregex.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) posix_api.obj : error LNK2001: unresolved external symbol "private: unsigned int __fastcall boost::cpp_regex_traits<wchar_t>::do_syntax_type(unsigned int)const " (?do_syntax_type@?$cpp_regex_traits@_W@boost@@ABIII@Z) bin\boost\libs\regex\build\boost_regex.dll\vc7.1-stlport\release\boost_regex-vc71-mt-p-1_31.dll : fatal error LNK1120: 1 unresolved externals The odd thing is that when i compile boost withou stlport included it does not generate this erros, but it would be perfect to have stlport+boost Any ideas? Thanks in advance, Rodrigo

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BGL in mangaged C++ (.Net )
by Bill Eidson 05 Aug '04

05 Aug '04

Has anyone had success running the BGL from with managed C++ code? I have code that compiles fine, but at runtime throws a .Net exception called TypeLoadException. Googleing and documentation I have read are no help. The graph used is a plain vanilla adjacency_list<> and the exception occurs durring the resize operation of the vertex vector. thanks in advance bille

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RE: [Boost-users] "using namespace" in template implementation fi les
by Jim.Hyslop 05 Aug '04

05 Aug '04

Erik Thiele wrote: > usually in normal non-template coding style i can do > > using namespace std; > > on the top of each .cpp file. but now i cannot do it, because it is > actually in a header file and i don't want to include another > namespace > in the interface definition. > > how can i solve the problem? i don't want to write "using > namespace std" > at the beginning of every template function declaration, but only once > per implementation file. Unfortunately, you can't. Unless you can find a way to move the function definitions out of line, into a separate file - then it would be treated as any other .cpp file. -- Jim Hyslop Senior Software Designer Leitch Technology International Inc. (http://www.leitch.com) Columnist, C/C++ Users Journal (http://www.cuj.com/experts)

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Re: [Boost-users] "using namespace" in template implementation files
by Jeff Williams 05 Aug '04

05 Aug '04

I think typically the solution is to just prefix std:: to everything. Once you get used to doing it, it doesn't even seem cumbersome anymore. (well that's my opinion at least) > > From: Erik Thiele <erik(a)thiele-hydraulik.de> > Date: 2004/08/05 Thu AM 09:27:10 EDT > To: boost-users(a)lists.boost.org > Subject: [Boost-users] "using namespace" in template implementation files > > hi > > i don't find any docs about that issue, so i ask it here: > > the usual approach to work with templates and separated > interface and implementation is as follows (i hope): > > x.hpp: > > template<class a> void foo(std::string xxx); > #include "x_impl.hpp" > > > x_impl.hpp: > > template<class a> void foo(std::string xxx) > { > string bla = xxx + "sdjkfh"; // <-- no std:: here !!!! > cout << bla; > } > > > > usually in normal non-template coding style i can do > > using namespace std; > > on the top of each .cpp file. but now i cannot do it, because it is > actually in a header file and i don't want to include another namespace > in the interface definition. > > how can i solve the problem? i don't want to write "using namespace std" > at the beginning of every template function declaration, but only once > per implementation file. > > > cu & thx > erik > > > -- > Erik Thiele > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

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"using namespace" in template implementation files
by Erik Thiele 05 Aug '04

05 Aug '04

hi i don't find any docs about that issue, so i ask it here: the usual approach to work with templates and separated interface and implementation is as follows (i hope): x.hpp: template<class a> void foo(std::string xxx); #include "x_impl.hpp" x_impl.hpp: template<class a> void foo(std::string xxx) { string bla = xxx + "sdjkfh"; // <-- no std:: here !!!! cout << bla; } usually in normal non-template coding style i can do using namespace std; on the top of each .cpp file. but now i cannot do it, because it is actually in a header file and i don't want to include another namespace in the interface definition. how can i solve the problem? i don't want to write "using namespace std" at the beginning of every template function declaration, but only once per implementation file. cu & thx erik -- Erik Thiele

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binding a member variable?
by Russell Hind 05 Aug '04

05 Aug '04

Is it possible to have a member variable in a bind expression or do I need to have an accessor method for the variable? E.g. I have the following structure and I want to use min_elemnt to find the point with the lowest m_Z value in a vector. class Point_c { public: double m_X; double m_Y; double m_Z; } Thanks Russell

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question about an implementation detail in boost::shared_ptr
by Jeff Williams 04 Aug '04

04 Aug '04

I was reading through the boost::shared_ptr source code, and I have a question about one small detail. This is in boost release 1.31.0: Around line 84 we have this code: // enable_shared_from_this support template<class T, class Y> void sp_enable_shared_from_this(boost::enable_shared_from_this<T> * pe, Y * px, shared_count const & pn) { if(pe != 0) pe->_internal_weak_this._internal_assign(px, pn); } I was curious, why is this function not inline? Jeff

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RE: [Boost-users] Re: Looking for some help with boost::thread::sleep()
by Kutch, Patrick G 04 Aug '04

04 Aug '04

Not a problem. It looks as if it goes into the # elif defined(BOOST_HAS_NANOSLEEP) section. Patrick Kutch Life is too short to drink bad coffee. -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Michael Glassford Sent: Tuesday, August 03, 2004 4:20 PM To: boost-users(a)lists.boost.org Subject: [Boost-users] Re: Looking for some help with boost::thread::sleep() Kutch, Patrick G wrote: > Has nobody else experienced this? Sorry, I forgot all about answering your original post. If you look at the thread::sleep() method, it looks like the following; can you tell me which path it's taking (there are several options for pthreads) when you have the problem? void thread::sleep(const xtime& xt) { for (int foo=0; foo < 5; ++foo) { #if defined(BOOST_HAS_WINTHREADS) int milliseconds; to_duration(xt, milliseconds); Sleep(milliseconds); #elif defined(BOOST_HAS_PTHREADS) # if defined(BOOST_HAS_PTHREAD_DELAY_NP) timespec ts; to_timespec_duration(xt, ts); int res = 0; res = pthread_delay_np(&ts); assert(res == 0); # elif defined(BOOST_HAS_NANOSLEEP) timespec ts; to_timespec_duration(xt, ts); // nanosleep takes a timespec that is an offset, not // an absolute time. nanosleep(&ts, 0); # else mutex mx; mutex::scoped_lock lock(mx); condition cond; cond.timed_wait(lock, xt); # endif #elif defined(BOOST_HAS_MPTASKS) int microseconds; to_microduration(xt, microseconds); Duration lMicroseconds(kDurationMicrosecond * microseconds); AbsoluteTime sWakeTime(DurationToAbsolute(lMicroseconds)); threads::mac::detail::safe_delay_until(&sWakeTime); #endif xtime cur; xtime_get(&cur, TIME_UTC); if (xtime_cmp(xt, cur) <= 0) return; } } Mike _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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RE: [Boost-users] Looking for some help with boost::thread::sleep()
by Kutch, Patrick G 03 Aug '04

03 Aug '04

Has nobody else experienced this? Patrick Kutch Life is too short to drink bad coffee. -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Kutch, Patrick G Sent: Thursday, July 22, 2004 8:07 PM To: boost-users(a)lists.boost.org Subject: [Boost-users] Looking for some help with boost::thread::sleep() I am used to putting in quick sleep() statements in my worker threads, usually a sleep(0) just to give up a timeslice, or maybe a sleep(1). Of course boost::thread::sleep takes an xtime object not a milliseconds value, so I wrote a small routine to simulate the sleep() statement using boost::thread::sleep: void inline UtilitySleep(long milliSeconds) { const int NANOSECONDS_PER_MILLISECOND = 1000000; if (0 == milliSeconds) { boost::thread::yield(); // just do a yield return; } boost::xtime time; int sec = 0; // if larger than 1 sec, do some voodoo for the boost::xtime struct if (milliSeconds >= 1000) { // convert ms > 1000 into secs + remaining ms int secs = milliSeconds /1000; milliSeconds = milliSeconds - secs*1000; sec += secs; } milliSeconds*=NANOSECONDS_PER_MILLISECOND; // normal boost time sleep stuff // get current time boost::xtime_get(&time,boost::TIME_UTC); // add # of desired secs and ms time.nsec+=milliSeconds; time.sec+= sec; // sleep until that time boost::thread::sleep(time); } It seems to always work fine unde Windows, however occasionally under Linux it appears that if I use a small value, such as sleep(2) that sometimes it takes longer to setup the values and call boost::thread:sleep() and I end up passing an xtime value that has already passed, basically blocking the thread forever. Anybody have any advice for me? Thanx! - Patrick _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Looking for a simple example of instantiating normal_distribution from the random library correctly
by Kuntz, David A 03 Aug '04

03 Aug '04

> I am instantiating normal_distribution from the random > library incorrectly and looking for a simple example of how to do it > correctly. > > I compiled, built and ran random_test.cpp and can see > when I step through the normal_distribution () operator that _r1 and > _r2 have values < 1. > > Here are the relevant excerpts from my incorrect attempt > at instantiation and calling the () operator: > > typedef boost::mt19937 base_generator_type; > > boost::uint32_t x = 42u; > Ideal4045EsmModel::base_generator_type > base_generator(x); > > double randomDrawResult; > > boost::normal_distribution<double> boostNormalRand; > > boostNormalRand.reset(); > > randomDrawResult = boostNormalRand(base_generator); > > This compiles, builds, and runs, but when I step through > the normal_distribution () operator, _r1 and _r2 have very large > positive values, resulting in an attempt to take the log of a > negative number and an Indefinite value being returned. > > I am a relatively inexperienced C++ developer. I have > built and stepped through random_test.cpp > (http://www.boost.org/libs/random/random_test.cpp) and can see that > its gets correct results, but I found it quite difficult to follow. Is > there anyone out there who could show me a simpler way? > > Thanks, > > Dave > > > >

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Bidirectionnal filtered multigraph
by Robert weldon 03 Aug '04

03 Aug '04

I've created a bidirectional filtered multigraph from an adjacency_list with vectorS and listS as containers for the vertices and egdes respectively. It seems the function edge(u,v,g) does not work properly for this kind of graph. I can detect the existence of an edge (u,v) if I iterate explicitly through the out_edges of the filtered graph but not if I use edge() directly on the filtered graph. Also, I get an exception when I remove an edge that was invisible to the edge(u,v,g) function while the bidirectionnal version of remove_edge for adjacency_list is erasing the edge ID form the in_edge list of the graph. Any idea why edge() does not work in this case? Patrick --------------------------------- Do you Yahoo!? New and Improved Yahoo! Mail - Send 10MB messages!

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Print all routes in a graph
by Daniele Carlucci 03 Aug '04

03 Aug '04

Hi all, I have seen the mail with dijikstra algorithm, there is a way to print all the routes in a graph from a node A and a node B? Thanks Daniele Carlucci

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Function Adaptor that takes an Address
by Ewan Mellor 03 Aug '04

03 Aug '04

I have a function T & foo() and I wish to use a function adaptor to turn this into T * foo2() In other words, I want a function adaptor that takes the address of its given function's result. Does such a thing exist in boost? TIA, Ewan Mellor.

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[BGL] Importing adjacency list from a txt file
by Rui Carvalho 03 Aug '04

03 Aug '04

Hi, I've got a file with the adjacency list of a graph, where each line contains the node index followed by the index of nodes that are adjacent to it (comma-separated). One of the lines of this file could read like: 1,3,4 This would mean that node '1' is adjacent to nodes '3' and '4' (undirected & unweighted graph). I'm declaring it as: typedef adjacency_list < vecS, vecS, undirectedS, no_property, no_property > Graph; Graph g; My question is: is there a simple way of reading the adjacency list into the graph from my txt file? I found Kevin_Bacon, but was looking for something more powerful. Then I found adjacency_list_io.cpp (is it documented?), but it wouldn't compile on MSVC. Am I missing something obvious? Thanks, Rui

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bind and weak pointers
by Jeff Williams 02 Aug '04

02 Aug '04

What is the prefered method of creating a boost::function<void()>, via boost bind, that is calling a member function of a class, and that class instance is held inside the bind object as a weak ptr. Thus, when the function is called, it will try to lock the shared_ptr, if successful it calls the bound function, otherwise it does nothing. Is there an standard way of doing this? Or do I have to write my own custom intermediate function? (which is how I do it now). Jeff

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execution order of slots (signals)
by oliver.kowalke＠t-online.de 02 Aug '04

02 Aug '04

Hello, if I create a signal sig with n slots (slots are ordered by group). What happens if : - I call sig(); and the first called slot removes the slot which is its successor - I call sig(); and the first slot connects a new slot to signal which has a higher priority (group -> higher values are executed at first) with best regards, Oliver -- "Der Spezialist ist ein Barbar, dessen Unwissenheit nicht allumfassend ist." Master's Voice, S.LEM

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RE: [Boost-users] Window API
by Ben Hutchings 02 Aug '04

02 Aug '04

Dr Jekyll <drjekyll(a)empirics.net> wrote: > Hi, > I use a library, which itself use Boost. This library define > > #define Handle boost::shared_ptr Ugh. > But because I intende to use WINAPI , this definition results > in a conflict > > c:\Program Files\Microsoft Visual Studio .NET > 2003\Vc7\PlatformSDK\Include\WinUser.h(3282): error C2751: > 'boost::shared_ptr' : the name of a function parameter cannot > be qualified <snip> > What should I do, if I have to keep the #define line in my library... Don't use that library. Its code quality is so low that you will probably waste more time working around its bugs then you can save by using it. If you disagree with this assessment, perhaps you could write and use a wrapper header that does something like: #ifndef LIBRARY_WRAPPER_H #define LIBRARY_WRAPPER_H #include "library.h" #undef Handle // undefine any other unwanted macros #endif // !defined(LIBRARY_WRAPPER_H)

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lambda and shared_ptr
by Vladimir Krasovsky 02 Aug '04

02 Aug '04

Hello boost-users(a)lists.boost.org, It seems to me that currently lambda's bind does not support shared_ptr as a second argument to bind, when first argument is a pointer-to-member. But boost::bind handles it perfectly. It would be nice for me to be able to write something like this: using namespace boost::lambda; struct SomeClass { int member1; }; boost::shared_ptr<SomeClass> ptr(new SomeClass); (bind(&SomeClass::member1, ptr) = _1)(5); Is it possible with current implementation of lambda? Or I have missed something important? -- Best regards, Vladimir mailto:vkrasovsky@yandex.ru

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[Help on implementation of boost regex]
by hackervalley 02 Aug '04

02 Aug '04

Hello, I try to use boost regex . I don't have a lot of experience of using boost regex . Boost regex examples aren't so explicit for me. So I need some help to parse this example file. Point(1) = {0,0,0,0.1}; Point(2) = {1,0,0,0.1}; Point(3) = {0,1,0,0.1}; Point(4) = {1,1,0,0.1}; Line(1) = {1,2}; Line(2) = {2,4}; Line(3) = {4,3}; Line(4) = {3,1}; Line Loop(5) = {2,3,4,1}; Plane Surface(6) = {5}; I can't read each informations to use it after. I can't match for use IdentificationNumber of Point(IdentificationNumber). Actually my code look so : /* g++ -Wall -O2 -o ifstream ifstream.cc */ #include <iostream> #include <fstream> #include <string> /* boost regex header */ #include <boost/regex.hpp> using namespace std; using namespace boost; int main (int argc, char argv[]) { char buffer[256]; string filename; string inputstring; cout << "Input filename "; cin >> filename; ifstream readfile (filename.c_str (), ios::in); if (!readfile.is_open ()) { cout << "Error opening file" << endl; return 0; } regex exPoint ("Point"); regex exLine ("Line"); regex IdentificationNumber ("[:digit:]"); while (!readfile.eof ()) { readfile.getline (buffer, 200); inputstring = buffer; if (regex_search (inputstring, exPoint)) { cout << "Point" << endl; smatch result; if (regex_search (inputstring, result, IdentificationNumber)) { cout << "Identification Number " << result << endl; } else cout << "Error regex_match" << endl; } if (regex_search (inputstring, exLine)) { cout << "Line" << endl; } cout << buffer << endl; } readfile.close (); return (0); } Thank you for help. Best regards hackervalley http://hackervalley.free.fr

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Accessing Internal Properties
by Jeffrey Holle 02 Aug '04

02 Aug '04

I'm using BGL checked out of CVS on Tue Jun 29 05:25:17 EDT 2004. Also using gcc 3.4.1 on a linux machine. I've a question of how to access internal properties. It appears that there are basically two templated function families for this: get - returns a value get_property_iter_range - returns iterator range get_property - returns a reference Are there more? I'm interested in the later. I've seen in the examples get_property being used to access properties global to a graph, but not edge or vertex properties. What I'd like to see is a varient of get_property (or equivalent) that takes an edge descriptor, so it provides access to a particular edge's named property. Does what I'm looking for exist?

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using boost::shared_ptr with boost::signal
by oliver.kowalke＠t-online.de 01 Aug '04

01 Aug '04

Hi, I want to use boost::shared_ptr with boost::signal. class A { private: int _i; public: A() : _i( 0) {} void operator()( int, std::string & s) { i+= 1; } void operator()( std::string & s, int) { i+= 2; } }; boost::shared_ptr< A > a( new A() ); boost::signal< void( int, std::string &) > rsig; boost::singal< void( std::string &, int) > lsig; rsig.connect( a); lsig.connect( a); rsig(0,"called from right side"); lsig("called from left side",0); Because a is a smart_ptr this code would not compile because operator() is not a member function. If I dereference the smart pointer when I connect to signal, changes of a are never know by the other signal instance. Maybe I can use a proxy class which aggregates the smart pointer but maybe there is a better solution?! with best regards, Oliver -- "Der Spezialist ist ein Barbar, dessen Unwissenheit nicht allumfassend ist." Master's Voice, S.LEM

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boost.graph external properties question.
by Jeffrey Holle 01 Aug '04

01 Aug '04

HI, I'm starting a project that uses boost.graph and I'm trying to decide if I should use internal or external properties. My code that implements external properties is like, for example: typedef boost::graph_traits <GraphT>::vertex_descriptor Vertex; typedef std::map<Vertex,Vertex_Datum,ltDescriptor<Vertex> > VertexData; My question is: Given my use of Vertex as a key of a std::map, it needs to be unique. Is this uniqueness quality maintained across different graphs? That is, can I instanciate 2 GraphT objects and populate both, but maintain only one VertexData container? Assume that I am not defining any internal properties in GraphT.

2 1

Vertex properties in BGL
by Ralph Wessel 01 Aug '04

01 Aug '04

I would like to use the BGL for a project I'm working on, but I haven't been able to find a particular piece of information. The system I'm modeling can be easily represented by a directed graph, but it seems that an essential vertex property can only be calculated on the fly based on the current in-edge and out-edge as the graph is traversed. Can this be supported in the BGL in a way which can feed this vertex property to the supplied algorithms?

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[HELP]How can I print a name of a node in a graph?
by Daniele Carlucci 01 Aug '04

01 Aug '04

Hi everybody, I wanna to print a graph but instead the id I want to print the name of the same. How can I make? I have token the list of the nodes from a list i. In i.name I have the name of the node. The code that I used to initialize the graph is: template <class Graph> void print(Graph& g) { typename Graph::vertex_iterator i, end; typename Graph::out_edge_iterator ei, edge_end; for(boost::tie(i,end) = vertices(g); i != end; ++i) { if (*i!=0){ cout<< *i << " --> "; for (boost::tie(ei,edge_end) = out_edges(*i, g); ei != edge_end; ++ei) cout << target(*ei, g) << " "; cout << endl;} } } void Main() { int nodo, cont, a; nodo=1; typedef graph_traits < file_dep_graph >::vertices_size_type size_type; size_type n_vertices; //Setta n_vertices con il numero di nodi n_vertices=id; // legge il numero di nodi file_dep_graph g(n_vertices); for (i=list.begin(); i != list.end(); ++i) { size_type k; for (cont=0; cont<(*i).v.size(); cont++) { a=(*i).v[cont]; //Connection between node "cont" and all the other nodes add_edge((*i).PID, a, g); } } print(g); Thanks Daniele

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