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>> c++ how to fix In file included from /usr/include/c++/4.6/algorithm:63:0,from error_code.cpp:2:/usr/include/c++/4.6/bits/stl_algo.h: In function ‘RandomAccessIterator std::find(RandomAccessIterator, RandomAccessIterator, const Tp&, std::randomaccessiteratortag) with RandomAccessIterator = gnucxx::normaliterator, std::vector > >, Tp = int]’:/usr/include/c++/4.6/bits/stlalgo.h:4403:45: instantiated from ‘IIter std::find(IIter, IIter, const Tp&) [with IIter = gnucxx::normaliterator, std::vector > >, Tp = int]’error_code.cpp:8:89: instantiated from here/usr/include/c++/4.6/bits/stlalgo.h:162:4: error: no match for ‘operator==’ in ‘first.gnucxx::normaliterator::operator [with Iterator = std::vector, Container = std::vector >, gnucxx::normaliterator::reference = std::vector& == val’/usr/include/c++/4.6/bits/stlalgo.h:162:4: note: candidates are:/usr/include/c++/4.6/bits/stlpair.h:201:5: note: template bool std::operator==(const std::pair&, const std::pair&)/usr/include/c++/4.6/bits/stliterator.h:285:5: note: template bool std::operator==(const std::reverseiterator&, const std::reverseiterator&)/usr/include/c++/4.6/bits/stliterator.h:335:5: note: template bool std::operator==(const std::reverseiterator&, const std::reverseiterator&)/usr/include/c++/4.6/bits/allocator.h:122:5: note: template bool std::operator==(const std::allocator&, const std::allocator&)/usr/include/c++/4.6/bits/allocator.h:127:5: note: template bool std::operator==(const std::allocator&, const std::allocator&)/usr/include/c++/4.6/bits/stlvector.h:1273:5: note: template bool std::operator==(const std::vector&, const std::vector&)/usr/include/c++/4.6/ext/newallocator.h:123:5: note: template bool gnucxx::operator==(const gnucxx::newallocator&, const gnucxx::newallocator&)/usr/include/c++/4.6/bits/stliterator.h:805:5: note: template bool gnucxx::operator==(const gnucxx::normaliterator&, const gnucxx::normaliterator&)/usr/include/c++/4.6/bits/stliterator.h:799:5: note: template bool gnucxx::operator==(const gnucxx::normaliterator&, const gnucxx::normaliterator&)/usr/include/c++/4.6/bits/stlalgo.h:4403:45: instantiated from ‘IIter std::find(IIter, IIter, const Tp&) with IIter = gnucxx::normaliterator, std::vector > >, Tp = int]’error_code.cpp:8:89: instantiated from here/usr/include/c++/4.6/bits/stlalgo.h:166:4: error: no match for ‘operator==’ in ‘first.gnucxx::normaliterator::operator [with Iterator = std::vector*, Container = std::vector >, gnucxx::normaliterator::reference = std::vector& == val’/usr/include/c++/4.6/bits/stlalgo.h:166:4: note: candidates are:/usr/include/c++/4.6/bits/stlpair.h:201:5: note: template bool std::operator==(const std::pair&, const std::pair&)/usr/include/c++/4.6/bits/stliterator.h:285:5: note: template bool std::operator==(const std::reverseiterator&, const std::reverseiterator&)/usr/include/c++/4.6/bits/stliterator.h:335:5: note: template bool std::operator==(const std::reverseiterator&, const std::reverseiterator&)/usr/include/c++/4.6/bits/allocator.h:122:5: note: template bool std::operator==(const std::allocator&, const std::allocator&)/usr/include/c++/4.6/bits/allocator.h:127:5: note: template bool std::operator==(const std::allocator&, const std::allocator&)/usr/include/c++/4.6/bits/stlvector.h:1273:5: note: template bool std::operator==(const std::vector&, const std::vector&)/usr/include/c++/4.6/ext/newallocator.h:123:5: note: template bool gnucxx::operator==(const gnucxx::newallocator&, const gnucxx::newallocator&)/usr/include/c++/4.6/bits/stliterator.h:805:5: note: template bool gnucxx::operator==(const gnucxx::normaliterator&, const gnucxx::normaliterator&)/usr/include/c++/4.6/bits/stliterator.h:799:5: note: template bool gnucxx::operator==(const gnucxx::normaliterator&, const gnucxx::normaliterator&)/usr/include/c++/4.6/bits/stlalgo.h:170:4: error: no match for ‘operator==’ in ‘first.gnucxx::normaliterator