I got this error when I tried to include threading in my project. I came here to get solution for the similar problem. I had used "using namespace std;" I commented "using namespace std;" and then also the problem was not resolved. While compiling, I had included the two flags -std=c++0x and -pthread. I think, the threading related problem may have resolved with pthread flag.
Here is a link which says the inclusion of remove_reference in std since c++11: http://en.cppreference.com/w/cpp/types/remove_reference I thought that the problem is due to the updated version of c++ standard, which has predefined remove_reference in std, used during compilation. When compiler has definition for remove_reference in std, then the redefinition in tesseract_callback.h was causing the error. I commented the redefinition in tesseract_callback.h file and made reference to std wherever remove_reference was called in the file. The compilation was normal. The result was same when executed. The problem was resolved. I uncommented the line "using namespace std;" and removed the modifications made to call the std functions. I could compile and run the program. On Saturday, 23 August 2014 00:54:51 UTC+5:30, zdenop wrote: > > Did you get this error with "using namespace std;"? > > Zdenko > > > On Fri, Aug 22, 2014 at 1:53 PM, Deepak Kumar <[email protected] > <javascript:>> wrote: > >> Tesseract header tesscallback.h file reports error due to redefinition of >> remove_reference. This remove_reference is a template and defined in std. >> >> To overcome this problem, I have commented out definition lines in >> tesscallback.h file and replaced remove_reference string with >> std::remove_reference in other places of the file. There are six >> occurrences of remove_reference string after definition. >> >> After making these in changes tesscallback.h file, the compilation is >> normal. >> >> On Friday, 14 March 2014 16:52:41 UTC+5:30, Giseli Ramos wrote: >>> >>> I'm trying to compile my project in Qt that uses tesseract and opencv. >>> In the .pro file: >>> >>> INCLUDEPATH += /usr/local/include/tesseract >>> >>> INCLUDEPATH += /usr/local/include/leptonica >>> >>> LIBS += -ltesseract -llept >>> >>> >>> The errors (I only past the first lines, because is a big list, all from >>> tesscallback.h): >>> >>> In file included from /usr/local/include/tesseract/baseapi.h:31:0, >>> >>> from src/utils/ocrReader.cpp:6: >>> >>> /usr/local/include/tesseract/tesscallback.h:278:29: error: >>> 'remove_reference' is not a template >>> >>> /usr/local/include/tesseract/tesscallback.h:278:29: error: redefinition >>> of 'struct remove_reference<T>' >>> >>> /usr/local/include/tesseract/tesscallback.h:277:29: error: previous >>> definition of 'struct remove_reference<T>' >>> >>> /usr/local/include/tesseract/tesscallback.h:296:12: error: expected >>> nested-name-specifier before 'remove_reference' >>> >>> /usr/local/include/tesseract/tesscallback.h:296:12: error: expected ';' >>> at end of member declaration >>> >>> /usr/local/include/tesseract/tesscallback.h:296:28: error: expected >>> unqualified-id before '<' token >>> >>> What is strange is that I have compiled with sucess with another simple >>> qt project to test tesseract funcionality, with the same config in the .pro >>> file. I don't know why this project in particular is having issues. >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "tesseract-ocr" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> Visit this group at http://groups.google.com/group/tesseract-ocr. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/tesseract-ocr/db209ba4-a04e-40fd-bd40-e3b5402e9664%40googlegroups.com >> >> <https://groups.google.com/d/msgid/tesseract-ocr/db209ba4-a04e-40fd-bd40-e3b5402e9664%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> >> For more options, visit https://groups.google.com/d/optout. >> > > -- You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/tesseract-ocr. To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/4e149fea-e121-4c32-a02c-28a23369c611%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
