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View Compilation Error

GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h: In function `const _Tp& std::__median(const _Tp&, const _Tp&, const _Tp&) [with _Tp = str]':
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:2484:   instantiated from `void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<str*, std::vector<str, std::allocator<str> > >, _Size = int]'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:2555:   instantiated from `void std::sort(_RandomAccessIterator, _RandomAccessIterator) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<str*, std::vector<str, std::allocator<str> > >]'
343534_0_17037.cpp:55:   instantiated from here
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:90: error: no match for 'operator<' in '__a < __b'
343534_0_17037.cpp:15: note: candidates are: bool str::operator<(str&)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:91: error: no match for 'operator<' in '__b < __c'
343534_0_17037.cpp:15: note: candidates are: bool str::operator<(str&)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:93: error: no match for 'operator<' in '__a < __c'
343534_0_17037.cpp:15: note: candidates are: bool str::operator<(str&)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:97: error: no match for 'operator<' in '__a < __c'
343534_0_17037.cpp:15: note: candidates are: bool str::operator<(str&)
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:99: error: no match for 'operator<' in '__b < __c'
343534_0_17037.cpp:15: note: candidates are: bool str::operator<(str&)


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