March 2008 - Boost-users - lists.preview.boost.org

negating a functor in a remove_copy_if
by PJ Durai 06 Mar '08

06 Mar '08

Hello everyone, I couldn't figure out how to use a logical negation in the following situation. struct IsConditionValid : public unary_function<Event, bool> { public: bool operator() (const Event& event)const {} }; remove_copy_if(events.begin(), events.end(), back_inserter(result), IsConditionValid()); <-- how to negate the condition object? What I really need is '! IsConditionValid()'. How can it be done using may be boost::bind ? appreciate your time. thanks pj

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Boost.Math.StatisticalDistributions
by johneddy101＠comcast.net 06 Mar '08

06 Mar '08

Hello, I realize that this library is not yet part of the boost distribution but I am using it and have come accross an issue. I am concerned that the logic in the various check functions may be flawed. Take for example the check_uniform function. The logic is as follows: if lower Ok && upper Ok && lower < upper return true else raise error stating that lower must be less than upper return false end if The functions used to determine if lower and upper are ok will raise errors if appropriate. If the policy is such that raising an error does not cause a throw, then control will return to the check_uniform method with an indication that lower or upper is not ok and we will enter the else block. Herein lies the problem. Consider the following scenario: creating a uniform distribution with: lower = 0.0 upper = postitive infinity Check upper will fail and send a message about the infinity. Enter the else block. A message will be raised that states that the lower parameter is not less than the upper. This is my concern. I believe the second message is unnecessary and potentially incorrect/misleading. Perhaps logic like shown below would be more appropriate: if lower not Ok || upper not Ok then return false else if lower >= upper raise error stating that lower must be less than upper return false else return true end if Thanks, John

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[regex] Question about pattern
by office＠mgs.co.at 06 Mar '08

06 Mar '08

Hi; I'm a newbie to regex patterns and need help in a relative simple task: I use boost::regex with perl syntax and I have to parse user input that provides a feature similar to the conditional formatting of cells in OpenOffice Calc. The string the user enters looks like this: >=30 [fg:red] [bg:white] or <0.0 [fg:none] [bg:transparent] First the user can enter an optional operator (> < <> = <= >=) followed by a integer or floating point number. This whole term is optional so [fg:red] [bg:white] is also a valid expression. The terms for color selection are partly optional, so valid expressions are [fg:red] or [bg:white] or [fg:red][bg:white] or [bg:white][fg:red] The key words for foreground and background colors are predefined by the software (red, green, blue, transparent, none, ...). I tried starting with a pattern like (C++ syntax for strings) ^(?:(<|<=|>|>=|=|<>){1}((?:-|\\+)?[0-9]+(?:\\.[0-9]+|\\,[0-9]+)?))?(?:\\s*)(?:(\\[FG:(?:BLUE|RED|GREEN|BLACK|YELLOW|WHITE|CYAN|NONE)\\])|(\\[BG:(?:BLUE|RED|GREEN|BLACK|YELLOW|WHITE|CYAN)\\])|(\\[FG:(?:BBLUE|RED|GREEN|BLACK|YELLOW|WHITE|CYAN|NONE)\\])(?:\\s*)(\\[BG:(?:BLUE|RED|GREEN|BLACK|YELLOW|WHITE|CYAN)\\])){1}$ But this does not allow the [fg:][bg:] terms to be interchanged and also when a new color or style will be added to the format class I have to change the pattern three times. I tried backward references with no success. So any help is very welcome Thanks in advance Martin

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including boost/thread.hpp gives compile error under VS7 in utility\base_from_member.hpp
by jason72＠internode.on.net 06 Mar '08

06 Mar '08

Using Visual Studio 2003 (VS7) and boost 1.34.1, I have simply declared the following code and I get the resulting errors: Code: #pragma once #include <deque> #include <boost/thread.hpp> using namespace std; <SNIP> Compiler output: cl /c /W3 /G6 /GF /Gy /nologo /DNDEBUG /DWIN32 /D_WIN32 /D_WIN32_WINNT=0x0500 /DWINVER=0x0500 /D_WIN32_IE=0x060 0 /D_AFXDLL /D_WTL_NO_CSTRING /D_WTL_NO_WTYPES /D_WTL_NO_UNION_CLASSES -D_X86_=1 /Ox /Z7 /I\src\r870\develop\work\pcd m\std\include /DNT /Dpcdm /DDBREL=870 /D_WIN32_DCOM -GX /DREGISTER_PROXY_DLL /GR /EHsc /MD /Fohtsserver.obj htsserver.cpp.cpp htsserver.cpp.cpp c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2143: syntax error : missing ',' before 'constant' c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(78) : see reference to class template instantiation 'boost::base_from_member<MemberType,UniqueID>' being compiled c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2226: syntax error : unexpected type 'T0' c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2334: unexpected token(s) preceding ':'; skipping apparent function body c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2143: syntax error : missing ',' before 'constant' c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2226: syntax error : unexpected type 'T0' c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2334: unexpected token(s) preceding ':'; skipping apparent function body c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2143: syntax error : missing ',' before 'constant' c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2226: syntax error : unexpected type 'T0' c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2334: unexpected token(s) preceding ':'; skipping apparent function body c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2143: syntax error : missing ',' before 'constant' c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2226: syntax error : unexpected type 'T0' c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2334: unexpected token(s) preceding ':'; skipping apparent function body c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2143: syntax error : missing ',' before 'constant' c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(76) : error C2226: syntax error : unexpected type 'T0' c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(78) : error C2143: syntax error : missing ';' before '}' c:\apps\boost_1_34_1\boost\utility\base_from_member.hpp(78) : error C2238: unexpected token(s) preceding ';' c:\apps\VS .NET 2003\Vc7\include\ostream(604) : fatal error C1903: unable to recover from previous error(s); stopping compilation NMAKE : fatal error U1077: 'cl' : return code '0x2' Stop. Note that I havent declared or used any of the threading or mutex objects yet. It is not possible to upgrade compiler version for this project. Regards, Jason

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Re: [Boost-users] link problem: boost + stlport + msvc8
by John Maddock 06 Mar '08

06 Mar '08

CHABO Gabriel wrote: > When I tried to link, I got an error saying that > libboost_program_options-vc80-mt-gdp-1_34_1.lib could not be found, > so I had to build it. > > I edited the user-config.jam file to add the following line: > > using stlport : : D:/Program Files/STLport-5.1.5 > D:/Program Files/STLport-5.1.5/lib ; Is that correct, or is "D:/Program Files/STLport-5.1.5 D:/Program Files/STLport-5.1.5/lib" being interpretted as a *single* path with spaces in it? I don't think you need the D:/Program Files/STLport-5.1.5/lib part in there - but I could be wrong! If all else fails try building program_options from your IDE as a static library project using the same build options as your .exe: then you just have to define BOOST_ALL_NO_LIB in your application project to disable auto-linking, and set the static lib project as a dependency of the .exe. HTH, John.

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Re: [Boost-users] link problem: boost + stlport + msvc8
by CHABO Gabriel 06 Mar '08

06 Mar '08

I also added "D:\Program Files\boost\boost_1_34_1" to the list of Additional Include Directives. Any ideas about what could be causing this? ________________________________ De : CHABO Gabriel Envoyé : mercredi 5 mars 2008 17:57 À : boost-users(a)lists.boost.org Objet : link problem: boost + stlport + msvc8 Hi, This is my first post to the mailing list, and I hope I'm not bringing up a silly issue but I've been over this a million times already and I still can't figure it out, so any help is greatly appreciated. This is my setup: Windows XP SP2 Visual Studio 2005 STLport-5.1.5 boost_1_34_1 I'm trying to write a tiny program, just to get stlport and boost to play nice together and I still have "unresolved external symbol" errors. I downloaded stlport-5.1.5 and built it according to the instructions: * configure.bat -c msvc8 * nmake /f msvc.mak * nmake /f msvc.mak install I also added stlport\bin to my path Next, I downloaded the boost_1_34_1 windows installer and checked all the options to get all the libraries and added it to my path. Next, I configured visual studio 2005 as follows: Tools -> Options -> Project and Solutions -> VC++ Directories -> Show directories for: Include Files: Add the path to stlport headers (D:\Program Files\STLport-5.1.5\stlport) Library Files: Add the path to stlport libs (D:\Program Files\STLport-5.1.5\lib) Next, on the project level, I Added __STL_DEBUG to the list of preprocessors. I'm trying to build a Multi-threaded Debug DLL (/MDd). I also set the (/Zc:wchar_t-) option. When I tried to link, I got an error saying that libboost_program_options-vc80-mt-gdp-1_34_1.lib could not be found, so I had to build it. I edited the user-config.jam file to add the following line: using stlport : : D:/Program Files/STLport-5.1.5 D:/Program Files/STLport-5.1.5/lib ; This is the command I used to build the new lib bjam --toolset=msvc-8.0 link=static stdlib=stlport threading=multi cxxflags="-Zc:wchar_t-" --with-program_options -a -d2 I built the lib and moved it from bin.v2 to lib. As you can see I took every precaution with wchar_t so that all the libs are compatible, and still every time I try to link the simple program I get this error: error LNK2019: unresolved external symbol "public: __thiscall boost::program_options::options_description::options_description(class stlpd_std::basic_string<char,class stlpd_std::char_traits<char>,class stlpd_std::allocator<char> > const &,unsigned int)" (??0options_description@program_options@boost@@QAE@ABV?$basic_string@DV?$char_traits@D@stlpd_std@@V?$allocator@D@2@@stlpd_std@@I@Z) referenced in function _main This is the simple program in question #include <iostream> #include <boost/program_options.hpp> int main(int argc, char* argv[]) { std::cout<<"boost stlport test\n"; boost::program_options::options_description desc("Allowed options"); } Any help is greatly appreciated Thx Gabriel ******************************* This e-mail contains information for the intended recipient only. It may contain proprietary material or confidential information. If you are not the intended recipient you are not authorised to distribute, copy or use this e-mail or any attachment to it. Murex cannot guarantee that it is virus free and accepts no responsibility for any loss or damage arising from its use. If you have received this e-mail in error please notify immediately the sender and delete the original email received, any attachments and all copies from your system.

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[iostream] Overloaded bitshift operators
by Robert Dailey 05 Mar '08

05 Mar '08

Does the Boost.Iostreams library have overloaded bitshift operators? That way I could do: boost::iostreams::stream<myclass> theOutputStream; theOutputStream << MyData;

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byte streams
by Ashkan Aliabadi 05 Mar '08

05 Mar '08

Hello everybody, I want a stream view of a dynamically allocated BYTE* buffer I have at hand. At first I thought boost::iostreams::basic_array< BYTE > would do the job since they're the closest thing I found in Boost IOStreams library, but as it turns out I was wrong, since the code fails to compile with dynamically allocated buffers. typedef boost::iostreams::basic_array< unsigned char > MemoryDevice; typedef boost::iostreams::stream< MemoryDevice > MemoryStream; BYTE* mem = new BYTE[ 1000 ]; MemoryDevice memoryDevice( mem ); MemoryStream memoryStream( memoryDevice ); I was wondering if there are any available streams that are capable of providing stream-like behavior to such buffers, or should I write a device to handle them? Any help is greatly appreciated.

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boost serialization: toString/fromString methods
by Christian Widmer 05 Mar '08

05 Mar '08

Dear group, I am trying to provide generic toString/fromString methods (to provide an interface to SWIG/Python serialization), which I'd like to implement in a base class CSGObject (from which all other classes are derived), such that the correct serialization code is called each time. After a bit of fiddling around (and with the help of the archive of this mailing list) I've got the toString method to work. However, things don't seem to be as straight for the fromString method. The following code illustrates what I'd like to do: virtual std::string toString() const { std::ostringstream s; boost::archive::text_oarchive oa(s); oa << this; return s.str(); } virtual void fromString(std::string str) { std::istringstream is(str); boost::archive::text_iarchive ia(is); //cast away constness CSGObject* tmp = const_cast<CSGObject*>(this); ia >> tmp; *this=*tmp; } However, although the correct serialization methods get called, only the information contained in the base class gets restored correctly, but none of the fields in any derived classes. My C++ is quite rusty, but I believe this is because *this is not a pointer and is thus statically bound. I hope there is a solution to this - how would you implement a fromString method like this? Is this even possible? What are the alternatives? Hints would be appreciated! Thank you, Chris

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[iostreams] Inconsistency b/w docs and code of stream()
by Nitay Joffe 05 Mar '08

05 Mar '08

>> > Nitay Joffe wrote: >> > Hey guys, >> > >> > I'm working with the boost::iostreams library to create a stream object >> > from >> > a Device class I've implemented. I'm trying to call the constructor that >> > allows setting of the buffer size and it is failing to compile on 64 bit. >> > >> > I used the documenation at >> > http://www.boost.org/libs/iostreams/doc/guide/generic_streams.html#stream >> > >> > The docs say the constructor is of the form: >> > >> > stream(const T& t, >> > std::streamsize buffer_size = default_value, >> > std::streamsize pback_size = default_value); >> > >> > >> > My code to create the stream looks like: >> > >> > MyDevice myDevice(...) >> > MyStream(myDevice, (std::streamsize)500); >> > >> > >> > On a 32 bit machine this works fine, but on a 64 bit one it does not >> > compile. The parameters I'm passing in are not matching up with a > > Would you please post the compiler errors? > >> > Thanks, >> > -n Sure, here is sample code that causes the error: #include <iosfwd> #include <boost/iostreams/categories.hpp> #include <boost/iostreams/stream.hpp> struct MyDevice { typedef char char_type; typedef boost::iostreams::source_tag category; std::streamsize read(char *s, std::streamsize n) { return n; } }; typedef boost::iostreams::stream<MyDevice> MyStream; int main() { MyDevice d; MyStream s(d, (std::streamsize)500); return 0; } And here are the compile errors: g++ a.cc k/usr/include/boost/iostreams/stream.hpp: In constructor 'boost::iostreams::stream<Device, Tr, Alloc>::stream(U100&, const U0&) [with U100 = MyDevice, U0 = std::streamsize, Device = MyDevice, Tr = std::char_traits<char>, Alloc = std::allocator<char>]': a.cc:18: instantiated from here /usr/include/boost/iostreams/stream.hpp:110: error: no matching function for call to 'MyDevice::MyDevice(MyDevice&, const long int&)' a.cc:5: note: candidates are: MyDevice::MyDevice() a.cc:5: note: MyDevice::MyDevice(const MyDevice&) make: *** [all] Error 1 If I change the (std::streamsize) to (int) it compiles. Cheers, -n

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