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Re: [Boost-users] Comparing two vectors element by element
by Gevorg Voskanyan 10 Sep '08

10 Sep '08

Sean Farrow wrote: > Hi Gevorg: > In this case it's the second, for more background for interest: > Each vector represents a braille cell. > A braille cell has 6 dots hence the std::bitset<6> so: > A vector can have up to 6 bitsets, each bitset represents one dots > state. > Hth. > Sean. Ok, what happens when a vector having 4 bitsets is compared with one having 6: - 4 bitsets of the first vector are compared with the first 4 bitsets of the second vector, ignoring last 2 elements? - The first vector is considered the lesser because it has fewer elements? - Is this not allowed? - something else? Best Regards, Gevorg

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Boost.spirit, boost.tokenizer or boost.regex
by Sean Farrow 10 Sep '08

10 Sep '08

Hi: I am currently in the process of needing to transform some input. I need to transform voice commands passed to a dll to strings of text inserted to an application. One voice command might be: "skip 5 lines". In this case the skip translates o sk, the 5 remains as it is, and there is nothing printed for the lines part of the command. Which boost library would be the best suited to this, boost.regex, boost.tokenizer or boost.spirit? Cheers Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 3431 (20080910) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

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Re: [Boost-users] Comparing two vectors element by element
by Gevorg Voskanyan 10 Sep '08

10 Sep '08

Sean Farrow wrote: > Hi: > The code doesn't compile here as std:bitsetdoesn't define the < > operator according to visual studio. I have a custom operator defined as > a structure: > struct BitSetComp > { > bool operator()(const std::bitset<6>& lhs, const std::bitset<6>& > rhs) const > { > return lhs.to_ulong() < rhs.to_ulong(); > } > }; > How can I use this in the code you providee, or do I need to redefine in > a certain way? > Cheers > Sean. [snip] Hi Sean, The answer depends on how you define one vector being less than another. E.g. given the following vectors: typedef std::bitset< 6 > my_bitset; typedef std::vector< my_bitset > my_bitset_vector; my_bitset_vector v1 = { my_bitset( "1100" ), my_bitset( "1101" ) }, v2 = { my_bitset( "1110" ), my_bitset( "1000" ) }, v3 = { my_bitset( "1101" ), my_bitset( "1111" ), my_bitset( "1010" ) }, v4 = { my_bitset( "1100" ), my_bitset( "1101" ), my_bitset( "1001" }; how shall these vectors compare to each other? #1. Lexicographical comparison - v1 < v2 is true, v1 < v3 is true, v2 < v3 is false, v1 < v4 is true, ... #include <algorithm> bool bitset_vector_less_1( const my_bitset_vector& lhs, const my_bitset_vector& rhs ) { return std::lexicographical_compare( lhs.begin(), lhs.end(), rhs.begin(), rhs.end(), BitSetComp() ); } #2. Each element of the first vector shall be less than the correponding element of the second vector - v1 < v2 is false, v2 < v1 is false, v4 < v3 is true, (here it is not immediately clear how would one compare vectors of different size such as v1 and v3) bool bitset_vector_less_2( const my_bitset_vector& lhs, const my_bitset_vector& rhs ) { assert( lhs.size() == rhs.size() ); return std::equal( lhs.begin(), lhs.end(), rhs.begin(), BitSetComp() ); } If you mean something else, explain your requirement with more detail and I will try to offer some more help. HTH, Best Regards, Gevorg P.S. Sorry but the answer is not strictly boost-related

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Comparing two vectors element by element
by Sean Farrow 10 Sep '08

10 Sep '08

Hi: I need to compare two vectors. I already have a function to compare two individual elements (std::bitsets) in this case. Can I use boost.foreach to do this, or is there a better way. I need to know whether vector one, is less than vector two. Any help apreciated. Cheers Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 3428 (20080909) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

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[asio] Error: terminate called after throwing an instance of
by Fabio Locati 10 Sep '08

10 Sep '08

Hi guys, I'm a new user of boost, and even newer of boost.asio. I create this code: http://codepad.org/DXLhsEtW (read.cpp) http://codepad.org/xlGDzgDC (read.h) http://codepad.org/DayP6oOB (http.h) and when I compile with: c++ read.cpp -o read /usr/local/lib/libboost_regex-gcc42-mt-1_36.so -I /usr/local/include/boost-1_36/ /usr/local/lib/libboost_system-gcc42-mt.so -O3 it compiles without any problems, but when I run it, it returns this: http://codepad.org/ad96WiPp I'm not getting why, someone have some idea? Thankyou for your time, Fabio A Locati

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Visual Studio 9.0 Express & boost 1.36 linker issues
by Alfonso Urdaneta 10 Sep '08

10 Sep '08

1. Build boost from scratch. C:\boost\boost_1_36_0>bjam --build-dir="c:\tmp\build-boost" --toolset=msvc --build-type=complete stage C:\boost\boost_1_36_0>bjam --build-dir="c:\tmp\build-boost" --toolset=msvc --build-type=complete install 2. Create a windows form application. add nothing but the line #include <boost/thread.hpp> 3. Update project re: inc and lib dirs. 4. link. Error output follows: 1>------ Build started: Project: b136_test, Configuration: Debug Win32 ------ 1>Linking... 1>b136_test.obj : error LNK2028: unresolved token (0A00000E) "public: virtual char const * __clrcall boost::thread_resource_error::what(void)const " (?what@thread_resource_error@boost@@$$FUBMPBDXZ) referenced in function "void __clrcall `dynamic initializer for 'const boost::thread_resource_error::`vftable'''(void)" (???__E??_7thread_resource_error@boost@@6B@@@YMXXZ@?A0xa2903452@@$$FYMXXZ) 1>b136_test.obj : error LNK2028: unresolved token (0A00000F) "public: virtual char const * __clrcall boost::lock_error::what(void)const " (?what@lock_error@boost@@$$FUBMPBDXZ) referenced in function "void __clrcall `dynamic initializer for 'const boost::lock_error::`vftable'''(void)" (???__E??_7lock_error@boost@@6B@@@YMXXZ@?A0xa2903452@@$$FYMXXZ) 1>b136_test.obj : error LNK2028: unresolved token (0A00001E) "public: virtual __clrcall boost::lock_error::~lock_error(void)" (??1lock_error@boost@@$$FUAM@XZ) referenced in function "public: virtual void * __clrcall boost::lock_error::`vector deleting destructor'(unsigned int)" (??_Elock_error@boost@@$$FUAMPAXI@Z) 1>b136_test.obj : error LNK2028: unresolved token (0A00003B) "public: virtual __clrcall boost::thread_exception::~thread_exception(void)" (??1thread_exception@boost@@$$FUAM@XZ) referenced in function "public: virtual void * __clrcall boost::thread_exception::`vector deleting destructor'(unsigned int)" (??_Ethread_exception@boost@@$$FUAMPAXI@Z) 1>b136_test.obj : error LNK2028: unresolved token (0A00003C) "public: virtual __clrcall boost::thread_resource_error::~thread_resource_error(void)" (??1thread_resource_error@boost@@$$FUAM@XZ) referenced in function "public: virtual void * __clrcall boost::thread_resource_error::`vector deleting destructor'(unsigned int)" (??_Ethread_resource_error@boost@@$$FUAMPAXI@Z) 1>b136_test.obj : error LNK2019: unresolved external symbol "public: virtual __clrcall boost::thread_resource_error::~thread_resource_error(void)" (??1thread_resource_error@boost@@$$FUAM@XZ) referenced in function "public: virtual void * __clrcall boost::thread_resource_error::`vector deleting destructor'(unsigned int)" (??_Ethread_resource_error@boost@@$$FUAMPAXI@Z) 1>b136_test.obj : error LNK2019: unresolved external symbol "public: virtual __clrcall boost::thread_exception::~thread_exception(void)" (??1thread_exception@boost@@$$FUAM@XZ) referenced in function "public: virtual void * __clrcall boost::thread_exception::`vector deleting destructor'(unsigned int)" (??_Ethread_exception@boost@@$$FUAMPAXI@Z) 1>b136_test.obj : error LNK2019: unresolved external symbol "public: virtual __clrcall boost::lock_error::~lock_error(void)" (??1lock_error@boost@@$$FUAM@XZ) referenced in function "public: virtual void * __clrcall boost::lock_error::`vector deleting destructor'(unsigned int)" (??_Elock_error@boost@@$$FUAMPAXI@Z) 1>b136_test.obj : error LNK2019: unresolved external symbol "public: virtual char const * __clrcall boost::lock_error::what(void)const " (?what@lock_error@boost@@$$FUBMPBDXZ) referenced in function "void __clrcall `dynamic initializer for 'const boost::lock_error::`vftable'''(void)" (???__E??_7lock_error@boost@@6B@@@YMXXZ@?A0xa2903452@@$$FYMXXZ) 1>b136_test.obj : error LNK2019: unresolved external symbol "public: virtual char const * __clrcall boost::thread_resource_error::what(void)const " (?what@thread_resource_error@boost@@$$FUBMPBDXZ) referenced in function "void __clrcall `dynamic initializer for 'const boost::thread_resource_error::`vftable'''(void)" (???__E??_7thread_resource_error@boost@@6B@@@YMXXZ@?A0xa2903452@@$$FYMXXZ) 1>C:\code\merlot\av8b\software\prototypes\b136_test\Debug\b136_test.exe : fatal error LNK1120: 10 unresolved externals 1>Build log was saved at "file://c:\code\merlot\av8b\software\prototypes\b136_test\b136_test\Debug\BuildLog.htm" 1>b136_test - 11 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== Verified that thread stuff is there C:\boost\lib>dir *thread* Volume in drive C has no label. Volume Serial Number is 1CFE-113F Directory of C:\boost\lib 09/08/2008 10:56 AM 35,328 boost_thread-vc90-mt-1_36.dll 09/08/2008 10:56 AM 31,348 boost_thread-vc90-mt-1_36.lib 09/08/2008 10:41 AM 52,736 boost_thread-vc90-mt-gd-1_36.dll 09/08/2008 10:41 AM 31,634 boost_thread-vc90-mt-gd-1_36.lib 09/08/2008 10:41 AM 31,634 boost_thread-vc90-mt-gd.lib 09/08/2008 10:56 AM 31,348 boost_thread-vc90-mt.lib 09/08/2008 11:18 AM 312,458 libboost_thread-vc90-mt-1_36.lib 09/08/2008 11:07 AM 1,281,058 libboost_thread-vc90-mt-gd-1_36.lib 09/08/2008 11:07 AM 1,281,058 libboost_thread-vc90-mt-gd.lib 09/08/2008 11:42 AM 353,712 libboost_thread-vc90-mt-s-1_36.lib 09/08/2008 11:42 AM 353,712 libboost_thread-vc90-mt-s.lib 09/08/2008 11:28 AM 1,270,890 libboost_thread-vc90-mt-sgd-1_36.lib 09/08/2008 11:28 AM 1,270,890 libboost_thread-vc90-mt-sgd.lib 09/08/2008 11:18 AM 312,458 libboost_thread-vc90-mt.lib 14 File(s) 6,650,264 bytes 0 Dir(s) 834,019,328 bytes free Suggestions for next step in figuring out what the problem is ? -- alfonso e. urdaneta _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ This e-mail and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error please notify the originator of the message. This footer also confirms that this e-mail message has been scanned for the presence of computer viruses. Any views expressed in this message are those of the individual sender, except where the sender specifies and with authority, states them to be the views of Indra Systems, Inc.

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Re: [Boost-users] Comparing two vectors element by element
by Peter Barker 10 Sep '08

10 Sep '08

On Tue, Sep 9, 2008 at 5:15 PM, Peter Barker <newbarker(a)gmail.com> wrote: > On Tue, Sep 9, 2008 at 4:55 PM, Sean Farrow > <sean.farrow(a)seanfarrow.co.uk> wrote: >> Hi: >> I need to compare two vectors. I already have a function to compare two >> individual elements (std::bitsets) in this case. Can I use boost.foreach >> to do this, or is there a better way. >> I need to know whether vector one, is less than vector two. >> >> Any help apreciated. >> Cheers >> Sean. > > Just use == as you do with built in data types e.g.: > > #include <vector> > #include <iostream> > > int main() > { > std::vector<int> v1; > std::vector<int> v2; > > if(v1 == v2) > std::cout << "They're the same" << std::endl; > } > Oops - sorry - I posted too quickly. Let's try again... Just use the < operator as you would with built in types. e.g.: #include <vector> #include <iostream> int main() { std::vector<int> v1; v1.push_back(5); std::vector<int> v2; v2.push_back(6); if(v1 < v2) std::cout << "v1 is smaller than v2" << std::endl; }

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boost::parameter -- merging two ArgPacks
by e r 10 Sep '08

10 Sep '08

hello, here's what i'm looking to do: template<typename ArgPack> result_type unary_fun(const ArgPack& args){ //typically calls args[some_tag] } template<typename ArgPack1,typename ArgPack2> result_type binary_fun(const ArgPack1& args1,const ArgPack2& args2){ return unary_fun(merge(args1,args2)); } i'm looking to define merge. not familiar enough with arg_list.hpp any help would be appreciated. thanks.

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[serialization] Assertion failed on application exit
by Takeo 10 Sep '08

10 Sep '08

Hello, I'm using boost 1.36 for serialization and everithing goes fine except this strange assertion error when I exit my application (console or window) : assertion failed: NULL != r, file libs\serialization\src\extended_type_info.cpp, line 49 The error occured in debug and release mode and boost is used in a static library called by the application. Have you got any idea of how to get rid of this? Thanks by advance. Emmanuel -- View this message in context: http://www.nabble.com/-serialization--Assertion-failed-on-application-exit-… Sent from the Boost - Users mailing list archive at Nabble.com.

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boost::posix_time::ptime - performance
by amit khandelwal 09 Sep '08

09 Sep '08

For 1 million invocations of boost::posix_time::ptime ptm (boost::posix_time::microsec_clock::local_time() ); // Get current time It takes about 1 sec. However, gettimeofday takes about 300 ms. gettimeofday takes about 300 ms. // struct timeval tv; // gettimeofday(&tv, NULL); Any pointers on why it takes so long? I want to ensure that timestamp call are not expensive. Any suggestion/recommendation? -- ------------------------------------------------------------------- Ph : (732) 647 5679 Email: khandelwal.amit(a)gmail.com Web: http://khandelwal.amit.googlepages.com/home -------------------------------------------------------------------

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