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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&, _Compare) [with _Tp = b, _Compare = bool (*)(b&, b&)]':
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:2521:   instantiated from `void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = b*, _Size = int, _Compare = bool (*)(b&, b&)]'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:2591:   instantiated from `void std::sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = b*, _Compare = bool (*)(b&, b&)]'
0_0_2245372_18214.cpp:27:   instantiated from here
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:124: error: invalid initialization of reference of type 'b&' from expression of type 'const b'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:125: error: invalid initialization of reference of type 'b&' from expression of type 'const b'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:127: error: invalid initialization of reference of type 'b&' from expression of type 'const b'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:131: error: invalid initialization of reference of type 'b&' from expression of type 'const b'
GCC/bin/../lib/gcc/mingw32/3.4.2/../../../../include/c++/3.4.2/bits/stl_algo.h:133: error: invalid initialization of reference of type 'b&' from expression of type 'const b'


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