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[serialization]Runtime Exception While Loading Old Serialized XML Files w/ 1.38
by Yaser Zhian 28 Jan '09

28 Jan '09

Hello list, I have a bunch of XML files that have been serialized using Boost.Serialization (the standard XML archive) and were working fine until we upgraded to the boost trunk a few days ago (unfortunately, I can't tell exactly what repository revision were used to generate the archives, but I know they were custom builds of pre-release 1.37 trunk, and the file_version attribute in the XML is set to 4.) Also, we use MSVC9.0sp1 for building everything. As soon as we upgraded to the trunk, we started getting runtime exceptions (invalid archive format) on some of our larger files. I think I have tracked it down to an incompatibility between version 4 and version 5 files that the newer build fails to take into consideration, the details of which (as far as I could find out) follows. In our data structures there is an std::list of pointers to objects previously serialized in the same serialization operation (which means these repeated pointers are stored as a reference to the previous object and the data is not duplicated.) Using the old library, when this list was being serialized, apparently the "item_version" was not being written (only the "count" filed and the "item"s were.) The old library apparently didn't expect to read this either, so everything worked out nicely. The new library however, expects an "item_version" field and throws when it doesn't find one. As I trace into the serialization library, I can see that there is logic there for new libraries to be able to handle archive format changes through time. Now my question is whether this "discrepancy" is actually a bug in either the older or the new code, or failing to handle the format change is a bug, or this issue has already come up and been dealt with in some other way? (how?) I should also mention that it is quite probably that the problem be in our code, but I have no idea how. I would appreciate any help in locating it. Any pointers, help, clues and general wisdom is greatly appreciated. -yzt

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need help building boots
by Vincenzo Calo' 28 Jan '09

28 Jan '09

Hi, my log file was scrubbed in my previous post. So I'm posting it again, sorry. I'm a newbie and I'm trying to build boost on a Mac OS X 10.4.11. I'm not able to generate the dylib files so something is going wrong. dhcp25:/usr/local/lib/boost_1_37_0 root# ./configure --with- libraries=iostreams Building Boost.Jam with toolset darwin... tools/jam/src/bin.macosxx86/ bjam Unicode/ICU support for Boost.Regex?... not found. Backing up existing Boost.Build configuration in user-config.jam.4 Generating Boost.Build configuration in user-config.jam... Generating Makefile... dhcp25:/usr/local/lib/boost_1_37_0 root# make install ./tools/jam/src/bin.macosxx86/bjam --user-config=user-config.jam -- prefix=/usr/local --exec-prefix=/usr/local --libdir=/usr/local/lib -- includedir=/usr/local/include --with-iostreams install ...patience... ...found 14372 targets... ...updating 21 targets... MkDir1-quick-fix-for-unix bin.v2/libs/iostreams MkDir1-quick-fix-for-unix bin.v2/libs/iostreams/build MkDir1-quick-fix-for-unix bin.v2/libs/iostreams/build/darwin-4.0.1 MkDir1-quick-fix-for-unix bin.v2/libs/iostreams/build/darwin-4.0.1/ release MkDir1-quick-fix-for-unix bin.v2/libs/iostreams/build/darwin-4.0.1/ release/threading-multi darwin.compile.c++ bin.v2/libs/iostreams/build/darwin-4.0.1/release/ threading-multi/file_descriptor.o /var/tmp//cc3iqlUI.s:7843:Complex expression. Absolute segment assumed. /var/tmp//cc3iqlUI.s:7845:Complex expression. Absolute segment assumed. /var/tmp//cc3iqlUI.s:7850:Complex expression. Absolute segment assumed. /var/tmp//cc3iqlUI.s:7852:Complex expression. Absolute segment assumed. /var/tmp//cc3iqlUI.s:7856:Complex expression. Absolute segment assumed. ... "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline - Wall -dynamic -no-cpp-precomp -gdwarf-2 -Wno-long-double -fPIC - DBOOST_ALL_NO_LIB=1 -DBOOST_IOSTREAMS_DYN_LINK=1 -DNDEBUG -I"." -c - o "bin.v2/libs/iostreams/build/darwin-4.0.1/release/threading-multi/ file_descriptor.o" "libs/iostreams/src/file_descriptor.cpp" ...failed darwin.compile.c++ bin.v2/libs/iostreams/build/darwin-4.0.1/ release/threading-multi/file_descriptor.o... darwin.compile.c++ bin.v2/libs/iostreams/build/darwin-4.0.1/release/ threading-multi/mapped_file.o /var/tmp//ccuFxoHi.s:15391:Complex expression. Absolute segment assumed. /var/tmp//ccuFxoHi.s:15393:Complex expression. Absolute segment assumed. /var/tmp//ccuFxoHi.s:15398:Complex expression. Absolute segment assumed. /var/tmp//ccuFxoHi.s:15400:Complex expression. Absolute segment assumed. .... "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline - Wall -dynamic -no-cpp-precomp -gdwarf-2 -Wno-long-double -fPIC - DBOOST_ALL_NO_LIB=1 -DBOOST_IOSTREAMS_DYN_LINK=1 -DNDEBUG -I"." -c - o "bin.v2/libs/iostreams/build/darwin-4.0.1/release/threading-multi/ mapped_file.o" "libs/iostreams/src/mapped_file.cpp" ...failed darwin.compile.c++ bin.v2/libs/iostreams/build/darwin-4.0.1/ release/threading-multi/mapped_file.o... darwin.compile.c++ bin.v2/libs/iostreams/build/darwin-4.0.1/release/ threading-multi/zlib.o darwin.compile.c++ bin.v2/libs/iostreams/build/darwin-4.0.1/release/ threading-multi/bzip2.o ...skipped <pbin.v2/libs/iostreams/build/darwin-4.0.1/release/ threading-multi>libboost_iostreams-xgcc40-mt-1_37.dylib for lack of <pbin.v2/libs/iostreams/build/darwin-4.0.1/release/threading- multi>file_descriptor.o... ...skipped <p/usr/local/lib>libboost_iostreams-xgcc40-mt-1_37.dylib for lack of <pbin.v2/libs/iostreams/build/darwin-4.0.1/release/ threading-multi>libboost_iostreams-xgcc40-mt-1_37.dylib... ...skipped <p/usr/local/lib>libboost_iostreams-xgcc40-mt.dylib for lack of <p/usr/local/lib>libboost_iostreams-xgcc40-mt-1_37.dylib... MkDir1-quick-fix-for-unix bin.v2/libs/iostreams/build/darwin-4.0.1/ release/link-static MkDir1-quick-fix-for-unix bin.v2/libs/iostreams/build/darwin-4.0.1/ release/link-static/threading-multi darwin.compile.c++ bin.v2/libs/iostreams/build/darwin-4.0.1/release/ link-static/threading-multi/file_descriptor.o /var/tmp//ccgEKwgZ.s:7843:Complex expression. Absolute segment assumed. / "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline - Wall -no-cpp-precomp -gdwarf-2 -Wno-long-double -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c -o "bin.v2/libs/iostreams/build/darwin-4.0.1/ release/link-static/threading-multi/file_descriptor.o" "libs/ iostreams/src/file_descriptor.cpp" ...failed darwin.compile.c++ bin.v2/libs/iostreams/build/darwin-4.0.1/ release/link-static/threading-multi/file_descriptor.o... darwin.compile.c++ bin.v2/libs/iostreams/build/darwin-4.0.1/release/ link-static/threading-multi/mapped_file.o /var/tmp//ccDow0aV.s:15391:Complex expression. Absolute segment assumed. /var/tmp//ccDow0aV.s:15393:Complex expression. Absolute segment assumed. /var/tmp//ccDow0aV.s:15398:Complex expression. Absolute segment assumed. /var/tmp//ccDow0aV.s:15400:Complex expression. Absolute segment assumed. /var/tmp//ccDow0aV.s:15404:Complex expression. Absolute segment assumed. /var/tmp//ccDow0aV.s:35405:Complex expression. Absolute segment assumed. "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline - Wall -no-cpp-precomp -gdwarf-2 -Wno-long-double -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c -o "bin.v2/libs/iostreams/build/darwin-4.0.1/ release/link-static/threading-multi/mapped_file.o" "libs/iostreams/ src/mapped_file.cpp" ...failed darwin.compile.c++ bin.v2/libs/iostreams/build/darwin-4.0.1/ release/link-static/threading-multi/mapped_file.o... darwin.compile.c++ bin.v2/libs/iostreams/build/darwin-4.0.1/release/ link-static/threading-multi/zlib.o darwin.compile.c++ bin.v2/libs/iostreams/build/darwin-4.0.1/release/ link-static/threading-multi/bzip2.o ...skipped <pbin.v2/libs/iostreams/build/darwin-4.0.1/release/link- static/threading-multi>libboost_iostreams-xgcc40-mt-1_37.a for lack of <pbin.v2/libs/iostreams/build/darwin-4.0.1/release/link-static/ threading-multi>file_descriptor.o... ...skipped <p/usr/local/lib>libboost_iostreams-xgcc40-mt-1_37.a for lack of <pbin.v2/libs/iostreams/build/darwin-4.0.1/release/link- static/threading-multi>libboost_iostreams-xgcc40-mt-1_37.a... ...skipped <p/usr/local/lib>libboost_iostreams-xgcc40-mt.a for lack of <p/usr/local/lib>libboost_iostreams-xgcc40-mt-1_37.a... ...failed updating 4 targets... ...skipped 6 targets... ...updated 11 targets... Not all Boost libraries built properly. Thanks a lot for your help. Best, Vincenzo

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help building boost
by Vincenzo Calo' 28 Jan '09

28 Jan '09

Hi, I'm a newbie and I'm trying to build boost on a Mac OS X 10.4.11. I'm not able to generate the dylib files so something is going wrong. I've attached the output log file. Thanks a lot for your help. Best, Vincenzo

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[date_time] new local_date_time constuctor
by a k 28 Jan '09

28 Jan '09

Hi, This is a request to add a third constructor of the class boost::local_time::local_date_time. THE PROBLEM: The following piece of code throws an exception. date d(2008, Oct, 26); time_duration td( 2, 30, 0 ); // 2:30 a.m. time_zone_ptr tz( new posix_time_zone("CET-1CEST,M3.5.0,M10.5.0/3") ); local_date_time myLtime( d, td, tz, EXCEPTION_ON_ERROR ); // last line throws This is because the date and time I chose happens to be located in the "vulnerble" moment when the wall clock gets moved back by an hour. In human terms, time 2:30am appears twice on 26-Oct-2008 in CET time zone because at 3:00 am we go back to 2:00 am and arrive at point 2:30 once more. In terms of boost::date_time library, the following condition appears: (local_date_time::check_dst(d, td, tz) == ambiguous); I would like to be able to write something like "On creating date/time infer the DST flag; on ambiguity assume no DST". In fact I can do that currently by replacing the last line from my above example with: bool inDST = (local_date_time::check_dst(d, td, tz) == is_in_dst); local_date_time myLtime(d, td, tz, inDST); This has two drawbacks however. First, check_dst gets called twice: first by me, second by the constructor, to check it once more. Second, it is too (IMO) verbose. THE REQUEST: Would it be possible to add a third constructor of local_date_time class that would accept a hint how to solve an ambiguity (if we have one). It would read like: local_date_time myLtime( d, td, tz, ASSUME_NOT_DST_ON_ERROR ); In the boost code I found it was already thought of, but got into a TODO state. Is there any chance that it gets implemented? Regards, &rzej

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[BGL] Segfaults when switching from digraph to undirected graph
by Grzegorz Slodkowicz 28 Jan '09

28 Jan '09

Hi, I ran into trouble after changing my directed adjacency_list into an undirected graph. The following code causes a segfault: for (set<Node>::iterator n = nodes.begin(); n != nodes.end(); ++n) { graph_traits<Graph>::out_edge_iterator edges_begin, edges_end; tie(edges_begin, edges_end) = out_edges(*n, g); for (graph_traits<Graph>::out_edge_iterator ne = edges_begin; ne != edges_end; ++ne) { Node nn1 = target(*ne, g); // ... K_o = out_degree(nn1, g); graph_traits<Graph>::out_edge_iterator nn1edges_begin, nn1edges_end; tie(nn1edges_begin, nn1edges_end) = out_edges(nn1, g); int k; graph_traits<Graph>::out_edge_iterator nn1e; for (nn1e = nn1edges_begin; nn1e != nn1edges_end; ++nn1e) { k = 0; if (nodes.count(target(*nn1e, g))) // !!! k++; } } } I cut out most of the stuff not directly related to accessing the graph. It segfaults in the line marked by !!!, so it would seem that out_edges returns an invalid range (I did some debugging and the this line executes quite a few times before the iterator becomes invalid. I can't seem to force gdb to recognise nn1e as a symbol so I can't tell which edge/node is causing the problem. All this is ran after the graph is initialised (it's quite large, ab. 22k nodes and 900k edges). Best regards, Greg

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multi_index: changing elements?
by Olaf Leidinger 28 Jan '09

28 Jan '09

Hello! I'm quiet new to boost and especially multi_index. I want to get a non-constant reference to elements I inserted into this container, but when dereferencing the iterator all I get is a const reference. What am I doing wrong? Please have a look at the attached example. Thanks a lot, Ciao, Olaf Leidinger

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Howto check Matrix Byte Size in Boost's Ublas Object
by Gundala Viswanath 28 Jan '09

28 Jan '09

Dear All, I have the following matrix implementation using Ublas. One is plain old matrix ('m') and the other is sparse matrix ('sm') My question is how can I check the byte size of 'sm' and 'm'? If my implementation is correct 'sm' byte size should give much smaller byte size than 'm'. Since both 'm' and 'sm' print the same output here. //____ BEGIN__ matrix<double> m(matDim[0], matDim[1], 0); coordinate_matrix<double> sm(matDim[0],matDim[1], 0); for (size_t i = 0; i < realValue.size(); ++i){ m(rowIndex[i]-1,colIndex[i]-1) = realValue[i]; sm(rowIndex[i]-1,colIndex[i]-1) = realValue[i]; } // End The full and compilable code can be found here: http://cpp.codepad.org/MbPm3OuK - Gundala Viswanath Jakarta - Indonesia

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[asio] still weird crashes with asio using libpion on windows
by Stephan Menzel 28 Jan '09

28 Jan '09

Hi all, I have been experiencing problems with weird crashes on Windows using libpion (http://www.pion.org/projects/pion-network-library) and the problem is still there with pion 1.0.10 but it changed a little and might shed some new light on the Let me just outline the situation. I have a simple project with an app and two libs, both using boost 1.36 at this time. The app links against those two libs, and one of the libs links against pion. So does the app of course. I've built pion as debug dll with boost 1.36. This runs on Windows and Linux. Now on Linux everything is fine, no problem at all, no dangerous valgrind output, nothing. On Windows however, the application crashes as soon as I do something with pion, and the callstack leads me to believe it's got something to do with boost asio. Usually it happens within asio win_mutex and looks a lot like this: http://trac.atomiclabs.com/ticket/32 To me this looks like an uninitialized mutex is being used. Not entirely however. I get this: First-chance exception at 0x7c91100b in myapp.exe: 0xC0000005: Access violation reading location 0x00000028. it's in win_mutex.hpp int do_lock() { #if defined(__MINGW32__) // Not sure if MinGW supports structured exception handling, so for now // we'll just call the Windows API and hope. ::EnterCriticalSection(&crit_section_); return 0; #else __try { -> ::EnterCriticalSection(&crit_section_); // CRASH } __except(GetExceptionCode() == STATUS_INVALID_HANDLE || GetExceptionCode() == STATUS_NO_MEMORY ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) { if (GetExceptionCode() == STATUS_NO_MEMORY) return ERROR_OUTOFMEMORY; return ERROR_INVALID_HANDLE; } return 0; #endif } This exception repeats many times until eventually the app crashes because 'this' is invalid, pointing somewhere it shouldn't. The Bug occurs several seconds after the application has started, but I don't have to actually access pion's http socket for that. I think it might not be pion's fault at all. The whole thing only happens on Windows and renders both pion useless on that system. I know, it's only Windows but I've been debugging around that for some months now and I'd really like that solved at some point. Any ideas? Thanks a lot... Stephan PS: I can't go to boost 1.37 because of: https://svn.boost.org/trac/boost/ticket/2541 With Chris apparently not responding or posting about ASIO any more is there any chance of this being fixed in the next release? Is ASIO maintained at all? Cause nobody seems to care about that bug. Again, I know it's only Windows but as long as Windows is officially a supported system an imporant lib like ASIO should work on it.

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Regex & Multiple Iterations in single string?
by John D 28 Jan '09

28 Jan '09

Hi I am building something that does multiple random search and replaces across a single text file read line by line. This is just underway and already a snag. I need to know if there is a lightweight to identify and as important handle multiple regex matches in a single string. >From what I am aware BOOST_REGEX_MATCH_EXTRA exists but adds overhead and is maybe overkill. Anyone know how I can run a regex of "e" on "ececece" and deal with the 4 occurences on an individual basis. Much thanks to you all keep up the hard work, John

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Re: [Boost-users] Boost and K-Cuts
by Gianni Loiacono 28 Jan '09

28 Jan '09

Thanks Mr. Zeljko Vrba for the help and for the link :) :) Now I'm reading some docs to understand if the k-way is the best solution for my project ;) Thanks another time. Bye.

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