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serialization trouble with boost when overloading the Allocator of string
by Olivier Vanden Bos 27 May '05

27 May '05

namespace TEST{ typedef std::basic_string<char, std::char_traits <char>, TEST_Allocator<char> > string; } boost\boost\serialization\access.hpp(106) : error C2039: 'serialize' : is not a member of 'std::basic_string<_Elem,_Traits,_Ax>' with [ _Elem=char, _Traits=std::char_traits<char>, _Ax= TEST_Allocator <char> ] Looking in the string.h template<class Archive, class U, class Allocator> inline void serialize( Archive & ar, STD::basic_string<U, Allocator> & t, const unsigned int file_version what is strange is when I look at my definition of basic_string in the file xstring of .NET 2003 I found template<class _Elem, class _Traits = char_traits<_Elem>, class _Ax = allocator<_Elem> > class basic_string : public _String_val<_Elem, _Ax> Any idea ? - VDB - "LNK2019: unresolved external symbol" Olivier Vanden Bos MSN#TheVdeub(a)hotmail.com AI Programmer UBISOFT Montreal

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boost::lexical_cast and special allocator
by Olivier Vanden Bos 27 May '05

27 May '05

I just discover that there is no way to change the allocator used in the streambuf of lexical_cast. It's not a big issue, but perhaps I could be a good improvement for this simple template ? - VDB - "LNK2019: unresolved external symbol" Olivier Vanden Bos MSN#TheVdeub(a)hotmail.com AI Programmer UBISOFT Montreal

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Can you compare boost::function objects?
by Stuart Dootson 27 May '05

27 May '05

I'm not certain (from the documentation) whether see if two boost::function objects are equal (I tend to think not!). The code below doesn't compile on VC7.1, raising an error about 4 ambiguous overloads of operator== #include <boost/function.hpp> int Flip() { return 2; } int main(int,char**) { boost::function<int()> f1 = &Flip; boost::function<int()> f2 = &Flip; bool const areTheyEqual = (f1 == f2); } Can someone confirm if this should/should not compile, please? Stuart Dootson

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Re: [Boost-users] Re: building and installing boost
by TBoafo＠aol.com 27 May '05

27 May '05

Dave, How do I resolve my problem? Regards Theo

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Re: [Boost-users] Re: building and installing boost
by TBoafo＠aol.com 26 May '05

26 May '05

I copied the boost installation zip file for windows the boost_1_32 zip file to c:\temp. The zip file was then expanded to c:\temp\boost_1_32_0. If one follows the instructions for building bjam from c:\temp\boost_1_32\tools\build\jam_src\ a bjam.exe gets created in c:\temp\boost_1_32_0\tools\build\jam_src\ bin.ntx86. I dont have any boost set up in the environment path. I have copied the bjam.exe to c:\windows\system32. I then type the boost install command below as per boost building instructions for visual c++ 7 as per below. C:\temp\boost_1_32_0>bjam "-sTOOLS=vc-7_1" install Regards Theo

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Boost serialization performance.
by Graham 26 May '05

26 May '05

I am rather new to Boost. I apologize in advance if I miss a protocol or two in the group. Please correct me. My group is considering using Boost for an application and some members have expressed concern over the performance of Boost serialization because a stack dump showed an excess of 100+ calls for a simple example shown below. Is there a good resource that shows the relative performance of Boost serializations? Code example: (Windows XP, MSVS 2003) Around 389 bytes where serialized. **example: (it's not pretty but it gets the job done) void save_schedule(const bus_schedule &s, const char * filename) { std::ostringstream ss(std::ios::binary); // make an archive std::ofstream ofs("perf.txt"); // output file LARGE_INTEGER start, finish, diff, frequency; // windows junk double duration; // duration char buff[256]; // adjust priority so high no one can interrupt! SetThreadPriority( GetCurrentThread() ,THREAD_PRIORITY_TIME_CRITICAL ); // perform timed test QueryPerformanceCounter(&start); boost::archive::binary_oarchive oa(ss); oa << s; QueryPerformanceCounter(&finish); QueryPerformanceFrequency(&frequency); // compute results diff.QuadPart = finish.QuadPart - start.QuadPart; duration = ((double)diff.QuadPart)/(frequency.QuadPart) ; sprintf( buff, "%f seconds\n", duration ); ofs<<buff; } **results: debug: 0.001636 seconds release: 0.000712 seconds Thanks in advance for an assistance. Graham

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building and installing boost
by TBoafo＠aol.com 26 May '05

26 May '05

I am trying to build and install boost libary on a laptop with OS Windows XP and Visual Studio.net and I am not sure its working as I am getting the following messages. C:\temp\boost_1_32_0>bjam "-sTOOLS=vc-7_1" install --------------------------------------------------------------------- skipping Boost.Python library build due to missing or incorrect configuration couldn't find Python.h in "c:/tools/python/include" You can configure the location of your python installation by setting: PYTHON_ROOT - currently "c:/tools/python" PYTHON_VERSION - The 2-part python Major.Minor version number (e.g. "2.2", NOT "2.2.1") - currently "2.2" The following are automatically configured from PYTHON_ROOT if not otherwise set: PYTHON_LIB_PATH - path to Python library object; currently "c:/tools/python/libs" --------------------------------------------------------------------- Jamfile:247: in load-jamfiles *** argument error * rule stage ( name : sources + : requirements * : local-build * ) * called with: ( include/boost-1_32 : : <locate>C:\Boost <tree-subdirs>C:\temp\ boost_1_32_0 <target>install : ) * missing argument sources C:\temp\boost_1_32_0\tools/build/v1\boost-base.jam:2306:see definition of rule ' stage' being called C:\temp\boost_1_32_0\tools\build\v1\bootstrap.jam:21: in boost-build C:\temp\boost_1_32_0\boost-build.jam:16: in module scope C:\temp\boost_1_32_0> Regards Theo

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RE: [Boost-users] regex_match problem
by Wilkinson, John 26 May '05

26 May '05

> > const string float_regex = > > "([+-]?(([\\d]+\\.?)|(\\.[\\d]+)|([\\d]+\\.[\\d]+))){0,1}"; > > All of your groups are "capturing", which would explain all of the > extra matches you get. You should make all but the outermost group in > float_regex non-capturing using "(?:" instead of "(". Thanks that explains it. I was searching for such a switch but assumed it would be in regex_match. John W.

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RE: [Boost-users] Searching through a multi_array[_ref] using STLalgorithms
by Sohail Somani 25 May '05

25 May '05

> -----Original Message----- > > Hi, > > I would like to do the following: > > multi_array<double,2> a(boost::extents [ extent_range(1,361)] > [ extent_range(1,3)]); > ... > multi_array<double,2>::iterator i = > std::find(a.begin(),a.end(),_1[2]==50.); > > That is, I want to find the row where the second column is > 50. Since lambda can't be used like this, how would you > propose I do this in a syntactically concise manner? std::find_if Doh.

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Searching through a multi_array[_ref] using STL algorithms
by Sohail Somani 25 May '05

25 May '05

Hi, I would like to do the following: multi_array<double,2> a(boost::extents [ extent_range(1,361)] [ extent_range(1,3)]); ... multi_array<double,2>::iterator i = std::find(a.begin(),a.end(),_1[2]==50.); That is, I want to find the row where the second column is 50. Since lambda can't be used like this, how would you propose I do this in a syntactically concise manner? Thanks Sohail

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