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[Boost Graph Library] Problem with a simple undirected_dfs example
by Ashwin N 25 Jul '08

25 Jul '08

Hi, I'm trying to get a simple undirected_dfs example to work. The aim is simple, to create an undirected graph and print its nodes in DFS order. Here's my code: ///////////////////////////////////////////////////////////////////////////////////// #include <boost/graph/adjacency_list.hpp> #include <boost/graph/undirected_dfs.hpp> #include <iostream> using namespace std; typedef boost::adjacency_list<boost::listS, boost::vecS, boost::undirectedS> MyGraph; typedef boost::graph_traits<MyGraph>::vertex_descriptor MyVertex; typedef boost::graph_traits<MyGraph>::edge_descriptor MyEdge; class MyVisitor : public boost::default_dfs_visitor { public: void discover_vertex(MyVertex v, const MyGraph& g) const { cerr << v << endl; } }; int main() { MyGraph g; boost::add_edge(0, 1, g); boost::add_edge(0, 2, g); boost::add_edge(1, 3, g); MyVisitor vis; boost::undirected_dfs(g, boost::visitor(vis)); return 0; } ///////////////////////////////////////////////////////////////////////////////////// I get the following errors which just make no sense to me: ///////////////////////////////////////////////////////////////////////////////////// Error 1 error C2780: 'void boost::put(T Bundle::* ,boost::adjacency_list<OutEdgeListS,VertexListS,DirectedS,VertexProperty,EdgeProperty,GraphProperty,EdgeListS> &,const Key &,const T &)' : expects 4 arguments - 3 provided d:\boost\boost\graph\undirected_dfs.hpp 149 Error 2 error C2780: 'void boost::put(Property,boost::adj_list_helper<Config,Base> &,const Key &,const Value &)' : expects 4 arguments - 3 provided d:\boost\boost\graph\undirected_dfs.hpp 149 Error 3 error C2784: 'void boost::put(const boost::put_get_helper<Reference,PropertyMap> &,K,const V &)' : could not deduce template argument for 'const boost::put_get_helper<Reference,PropertyMap> &' from 'boost::detail::error_property_not_found' d:\boost\boost\graph\undirected_dfs.hpp 149 Error 4 error C2784: 'void boost::put(const boost::writable_property_map_archetype<KeyArchetype,ValueArchetype> &,const writable_property_map_archetype<KeyArchetype,ValueArchetype>::key_type &,const writable_property_map_archetype<KeyArchetype,ValueArchetype>::value_type &)' : could not deduce template argument for 'const boost::writable_property_map_archetype<KeyArchetype,ValueArchetype> &' from 'boost::detail::error_property_not_found' d:\boost\boost\graph\undirected_dfs.hpp 149 Error 5 error C2784: 'void put(T *,ptrdiff_t,const V &)' : could not deduce template argument for 'T *' from 'boost::detail::error_property_not_found' d:\boost\boost\graph\undirected_dfs.hpp 149 ///////////////////////////////////////////////////////////////////////////////////// What am I doing wrong? How do I get to print nodes in DFS order? I'm on VC++ 2008 Express Edition. I have looked at the undirected_dfs example given here: <http://www.boost.org/doc/libs/1_35_0/libs/graph/example/undirected_dfs.cpp> That code seems to be trying to achieve something else. TIA, ~ash -- Groucho Marx - "A hospital bed is a parked taxi with the meter running."

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[interprocess]managed memory segment items
by Eugen Stoianovici 25 Jul '08

25 Jul '08

Is there a way to get all names for objects mapped into a managed shared memory? Thanks, Eugen -- Sent from Gmail for mobile | mobile.google.com

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Asio - Errors
by Tim Pynegar 25 Jul '08

25 Jul '08

Hi, I'm trying to call bind on a udp::socket separately from the udp::socket constructor. As in when i use the overloaded udp::socket constructor and pass in a local endpoint for it to do the bind on it work's fine. However when i only pass in the boost::asio::io_service and then call bind on the socket later with a local scope udp::endpoint it throws the following exception. First-chance exception at 0x76b442eb in Chatter.exe: Microsoft C++ exception: boost::system::system_error at memory location 0x0012e774.. I've got two questions, the first is does anyone have any idea of what this is, and the second is how do i get access to the socket error codes or states. As in if i knew what the error was i'd maybe be able to fix this myself and i appriciate that it's difficult without seeing the code itself to tell me what i'm doing wrong. Thanks, Tim.

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Pool allocator with multiple dynamic libraries
by Fedor Chelnokov 25 Jul '08

25 Jul '08

Am I right in saying that when boost::pool_allocator is used in a Windows program consisting of several DLLs, there is no single shared pool but as many pools as the number of modules? So the usage of containers with boost::pool_allocator is not safe because of the allocator’s comparison operation (==), which is always returns true.

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[test] BOOST_CHECK_EQUAL type to stream
by Michiel Helvensteijn 25 Jul '08

25 Jul '08

I understand why the types of the arguments to BOOST_CHECK_EQUAL (and BOOST_CHECK_PREDICATE, etc.) must have operator<< correctly defined. Otherwise, the failure message could not be properly printed. The type I want to check is vector<int>. But it seems not to be enough to simply define the following function: ostream& operator<<(ostream& out, const vector<int>& vec); The error message is long and very templatey, but the essence is: .../test_tools.hpp:298: error: no match for 'operator<<' in 'ostr << t' What more should I do to be able to use vector<int> in these tests? Thanks! -- Michiel Helvensteijn

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using boost::test to test private methods
by david.weber＠l-3com.com 24 Jul '08

24 Jul '08

I've searched a little bit, but having some difficulties finding good examples. So, I have a template class, in which I'm trying to test some private methods. Let's table the philosophical reasons for doing so, I'm just having difficulties setting up the mechanics of it. The best way I've seen, is to make a testing class a friend of class to be tested. My class to be tested is in a namespace, that the test cases are not members of. I'm running into all sorts of compiler errors. Does anyone have sample code about making this work. Strategies for separating the test code from the production code as much as possible? This is a first stab at automatic unit testing for me, so any assistance would be great. Thanks --dw

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[detail] atomic_count operator++ returns different types
by Doug Mahlum 24 Jul '08

24 Jul '08

Why does the atomic_count ++ operator return a "long" for the win32,solaris and sync compilers, but returns "void" for all gcc compilers? The -- operator returns a "long" in all cases, so this would appear to be an annoying, anomalous behavior. But hopefully a rational explanation exists. Also, if it's the value of the ++ that is wanted, two threads could return the same value of this atomic counter, since another call is required to obtain it for the gcc case. Thank you, Doug

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the boost xml serialization to a stringstream does not have an end tag.
by Sangeeta Singh 24 Jul '08

24 Jul '08

Hi, When I xml serialize an object to a stringstream i get the following output <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> <!DOCTYPE boost_serialization> <boost_serialization signature="serialization::archive" version="3"> <bidResponse class_id="0" tracking_level="0" version="0"> <oppId>69</oppId> <delay>0</delay> <bid class_id="1" tracking_level="0" version="0"> <maxBid>5.3000002</maxBid> <minBid>5.3000002</minBid> <adBlob>adblob</adBlob> </bid> </bidResponse> As can be seen the end tag </boost_serialization> is missing. thi shappens even if I flush the stringstream. If i xml serialize to a text file I do not see this problem here is the o/p when I xml serialize to a text file <?xml version="1.0" encoding="UTF-8" standalone="yes" ?> <!DOCTYPE boost_serialization> <boost_serialization signature="serialization::archive" version="3"> <bidRequest class_id="0" tracking_level="0" version="0"> <oppId>34567889</oppId> </bidRequest> <bidRequest class_id="0" tracking_level="0" version="0"> <oppId>44567889</oppId> </bidRequest> </boost_serialization> Any idea how to resolve this. Thanks, Sangeeta

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Form Link
by anil kumar 24 Jul '08

24 Jul '08

Hi All, I have posted a mail regarding a problem and got a reply too and issue is also solved as i am new to this boost community can anybody tell me if there is any forum where we can easily post thread i mean any issue and sort it out because mailing the issue and waiting for the reply and my whole mail box is filled with lot of mails from the address. So can any one guide me where i can just log in and post issue and discuss with other BOOST users. Please send me the links to my mail id. Thanks in advance. Anil anil26_prodigy(a)hotmail.com _________________________________________________________________ Missed your favourite programme? Stop surfing TV channels and start planning your weekend TV viewing with our comprehensive TV Listing http://entertainment.in.msn.com/TV/TVListing.aspx

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[numeric][conversion][docs] Questions about terms.
by John C. Femiani 24 Jul '08

24 Jul '08

I just read the docs for numeric/conversion at http://tinyurl.com/5bflvn, and I have some questions. Basically I am getting confused about abstract values versus represented values, verses how they are represented (e.g. as fixed point or floating point numbers). 1) Is the density of scaled integers or fixed point types greater than one? The size of the numeric set is larger than the width, so it seams like the density would be greater than one. 2) Is the precision of long int really greater than the precision of short int? It is strange to me that precision seems to have a different meaning for integer than for "floating" types. 3) What is the difference between the numeric sets "Whole" and "Int"? They both represent the same values from the set of integers, which is a subset of real numbers. Does this mean that the _way_ the values are represented is important? 4) Is it true that a fixed point type would be classified as a 'floating' type? Also, are complex types numeric? Thanks, --John

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