- Boost-users - lists.preview.boost.org

Re: A boost.graph edge problem
by Lars Kunert 23 Sep '04

23 Sep '04

Have a look at your compare operator! It orders two pairs of values (A,B)(C,D) like this: (A<B) || (!(A<B) && (C<D)) this expession equals: (A<B) || (C<D) lets consider the test case: (1,2) (2,1) Your operator will return return true in whatever order this pair is compared... I think an operator like (A<B) || ((A==B) && (C<D)) will help > ... > typedef multiset<DataEdge,ltSubgraph> Edges; > ... > struct ltSubgraph : public > std::binary_function<DataEdge,DataEdge,bool> > { > bool operator() (const DataEdge& s1, const DataEdge& s2) const > { > return s1.m_source < s2.m_source || > (!(s1.m_source < s2.m_source) && s1.m_target < s2.m_target); > } > };

1 0

A boost.graph edge problem
by Jeffrey Holle 23 Sep '04

23 Sep '04

I'm using boost 1.31.0 and gcc 3.4.2. While this problem is more of an application code problem, since I got no help on other lists, I trying this one with hopes of a response. I need to identify parallel edges from my graph, which is defined as: typedef subgraph<adjacency_list<vecS, vecS, bidirectionalS, property<vertex_index_t,int,VertexProperty>, EdgeProperty> > DataGraphT; typedef boost::graph_traits <DataGraphT>::edge_descriptor DataEdge; In the test case that I'm working on, I know I have parallel edges, actually 4 sets of 3. I'd like to use this code: DataGraph::handleParallelEdges(void) { typedef multiset<DataEdge,ltSubgraph> Edges; Edges edges; graph_traits<DataGraphT>::edge_iterator ei,ei_end; for (tie(ei,ei_end)=boost::edges(dataGraph_);ei!=ei_end;++ei) edges.insert(*ei); for (Edges::const_iterator iter = edges.begin(); iter != edges.end(); advance(iter,edges.count(*iter))) if (edges.count(*iter)>1) cout << "See duplicate" << endl; } However, when count never returns. The likely cause of this (I suspect) is the ltSubgraph functor. Its definition is: struct ltSubgraph : public std::binary_function<DataEdge,DataEdge,bool> { bool operator() (const DataEdge& s1, const DataEdge& s2) const { return s1.m_source < s2.m_source || (!(s1.m_source < s2.m_source) && s1.m_target < s2.m_target); } }; I say this because I can see that this functor is being continuously called in this infinite loop. Note that I use this functor in multiple other cases, but not with an associate container that allows duplicate keys. Is there a problem with this code?

1 1

boost graph meant to contain classes and functions?
by Stephen torri 22 Sep '04

22 Sep '04

I see that the boost graph library is used to contain data but can it be used to contain a class which a visitor moves along the graph per a preset algorithm calling interfacing functions as it moves along? Here is an example. class Color_Base { virtual ~Color_Base(){} virtual std::string get_Name () = 0; }; class Red : Color_Base { virtual ~Red (){} virtual std::string get_Name () { return std::string("Red"); } }; class Yellow : Color_Base { virtual ~Yellow (){} virtual std::string get_Name () { return std::string("Yellow"); } }; class Blue : Color_Base { virtual ~Blue (){} virtual std::string get_Name () { return std::string("Blue"); } }; So we could have a graph like | Blue -- Red | / | / | / Yellow I have a visitor called Color_Visitor which has the following pseudo code: for each vertice in graph visit vertice call get_Name() print result Stephen -- Email: storri(a)torri.org

3 4

No defines using bjam on Windows with msvc
by Phillip Seaver 22 Sep '04

22 Sep '04

As I said in an earlier post, I'm trying to start using jam for our projects. I'm using Boost.Jam ver 3.1.4. When I build on Windows with TOOLS=msvc and use "bjam -d2", the command-line doesn't have any define flags on it. Several of our source files rely on "WIN32", e.g. to determine the platform. Has anyone seen this before? I feel like I'm overlooking something obvious, but I haven't been able to figure it out. Here's the beginning of the output from "bjam -d2": ***** ...found 156 targets... ...updating 11 targets... vc-Cc ..\..\libs\ETSopt\bin\libetsopt.lib\msvc\debug\runtime-link-dynamic\etsopt .obj "cl" /Zm800 -nologo -c /Z7 /Od /Ob0 /GX /GR /MDd -I"..\..\libs\ETSopt" -I"C:\PROGRA~1\MICROS~2\VC98\include" -Fo"..\..\libs\ETSopt\bin\libetsopt.lib\ msvc\debug\runtime-link-dynamic\etsopt.obj" "etsopt.c" etsopt.c ***** Thanks in advance, Phillip

2 1

Re: [Boost-users] [Linker error] undefined reference to`boost::gregorian::greg_month::as_short_string() const'
by aqsis＠mail.tele2.co.uk 21 Sep '04

21 Sep '04

I understand what you mean now. In that case you would need to pass the filter name into the DSO function as a parameter. So your DSO declaration would look like... SHADEOP_TABLE(shadeopname) = { { "float shadeopname_fs(float, string)", "", "" }, . . }; And the argv[] argument passed to the method would contain the filter name as it's second value, i.e. SHADEOP(shadeopname_fs) { float *result = (float *)argv[0]; float x = *(float *)argv[1]; STRING_DESC *filt = (STRING_DESC *)argv[1]; if(strcmp(filt->s, "box")==0) { /* Filter with a box filter */ . . . Hope this helps. Paul G Original Message: ----------------- From: Jeff Garland jeff(a)crystalclearsoftware.com Date: Tue, 21 Sep 2004 05:15:39 -0700 To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] [Linker error] undefined reference to`boost::gregorian::greg_month::as_short_string() const' On Mon, 20 Sep 2004 20:33:51 -0700 (PDT), Zhoujie Mao wrote I'm going to presume the built library file libboost_date_time-gcc-1_31.a is in D:/boost/lib. Please double check that. > Below is part of my make file > CPP = g++.exe > CC = gcc.exe > WINDRES = windres.exe > RES = > OBJ = main.o $(RES) > LINKOBJ = main.o $(RES) > LIBS = -L"D:/Dev-Cpp499/lib" -L"D:/boost/lib" > -L"D:/boost/lib/libboost_date_time-gcc-1_31.a" ^^^^^^^^^^^^ this looks wrong ^^^^^^^^^^^ change it to the following: -lboost_date_time-gcc-1_31 so your LIBS line looks like: LIBS = -L"D:/Dev-Cpp499/lib" -L"D:/boost/lib" -lboost_date_time-gcc-1_31 > I did include the libboost_date_time-gcc-1_31 but it > did not work. Well, not actually because the -L controls the search path and you can't point it directly to the library.... HTH, Jeff _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ .

1 0

setting thread priority?
by Simmons, Aaron 21 Sep '04

21 Sep '04

In Boost.Threads, are there plans to allow adjustment of a thread's priority? Thanks, aaron

2 1

sockets/pipes
by Simmons, Aaron 21 Sep '04

21 Sep '04

Does Boost have named-pipes and/or sockets classes? If no... Are any in the works? Does anyone know of a good C++ pipes and/or sockets wrapper classes? Thanks, Aaron Simmons

2 1

RE: [Boost-users] sockets/pipes
by Richard Reitmeyer 20 Sep '04

20 Sep '04

I'd suggest ACE. Look for Douglas Schmidt's stuff at wustl. > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Simmons, Aaron > Sent: Monday, September 20, 2004 2:12 PM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] sockets/pipes > > > Does Boost have named-pipes and/or sockets classes? > > If no... Are any in the works? Does anyone know of a good C++ pipes > and/or sockets wrapper classes? > > > > Thanks, > Aaron Simmons > > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

1 0

RE: [Boost-users] Can boost::tokenizer tokenize 2byte character s tring?
by Rozental, Gennadiy 20 Sep '04

20 Sep '04

If it 2byte why are you using boost::char_separator<char>? Shouldn't you be using boost::char_separator<wchar_t>? Gennadiy. > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Lee, Joo-Young > Sent: Saturday, September 18, 2004 12:39 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] Can boost::tokenizer tokenize 2byte > character string? > > > Hi. > > I try to use 'boost::tokenizer<boost::char_separator<char> >' > to separate 2byte character string like Korean, Japanese, or Chinese. > > But, I found that it does not works correctly. > > Is there a solution? > > Thanks for the help, > > Lee Joo-Young > > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

2 1

RE: [Boost-users] Can boost::tokenizer tokenize 2byte character string?
by Ben Hutchings 20 Sep '04

20 Sep '04

Gennadiy Rozental <gennadiy.rozental(a)thomson.com> wrote: > If it 2byte why are you using boost::char_separator<char>? > > Shouldn't you be using boost::char_separator<wchar_t>? I think Lee Joo-Young is talking about multibyte strings in an encoding such as GB2312 and Shift_JIS that uses 1 or 2 bytes per character rather than wide strings that use a fixed 2 bytes per character on certain platforms (or rather, used to until UTF-16 came along). Ben.

1 0