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View Compilation Error

0_0_21377925_28386.cpp:21:16: error: 'bonst' has not been declared
  mat operator-(bonst mat &a)bonst{
                ^
0_0_21377925_28386.cpp:21:26: error: expected ',' or '...' before '&' token
  mat operator-(bonst mat &a)bonst{
                          ^
0_0_21377925_28386.cpp:21:28: error: expected ';' at end of member declaration
  mat operator-(bonst mat &a)bonst{
                            ^
0_0_21377925_28386.cpp:21:29: error: 'bonst' does not name a type
  mat operator-(bonst mat &a)bonst{
                             ^
0_0_21377925_28386.cpp: In constructor 'mat::mat()':
0_0_21377925_28386.cpp:8:10: error: 'a' was not declared in this scope
   memset(a,0,sizeof a);
          ^
0_0_21377925_28386.cpp: In function 'int main()':
0_0_21377925_28386.cpp:64:7: error: no match for 'operator-' (operand types are 'mat' and 'mat')
   ma=A-B;
       ^
0_0_21377925_28386.cpp:64:7: note: candidates are:
0_0_21377925_28386.cpp:21:6: note: mat mat::operator-(int)
  mat operator-(bonst mat &a)bonst{
      ^
0_0_21377925_28386.cpp:21:6: note:   no known conversion for argument 1 from 'mat' to 'int'
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_21377925_28386.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:328:5: note: template<class _Iterator> typename std::reverse_iterator<_Iterator>::difference_type std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator-(const reverse_iterator<_Iterator>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:328:5: note:   template argument deduction/substitution failed:
0_0_21377925_28386.cpp:64:8: note:   'mat' is not derived from 'const std::reverse_iterator<_Iterator>'
   ma=A-B;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_21377925_28386.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:380:5: note: template<class _IteratorL, class _IteratorR> decltype ((__y.base() - __x.base())) std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator-(const reverse_iterator<_IteratorL>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:380:5: note:   template argument deduction/substitution failed:
0_0_21377925_28386.cpp:64:8: note:   'mat' is not derived from 'const std::reverse_iterator<_Iterator>'
   ma=A-B;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_21377925_28386.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1121:5: note: template<class _IteratorL, class _IteratorR> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&)
     operator-(const move_iterator<_IteratorL>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1121:5: note:   template argument deduction/substitution failed:
0_0_21377925_28386.cpp:64:8: note:   'mat' is not derived from 'const std::move_iterator<_Iterator>'
   ma=A-B;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:67:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_21377925_28386.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1128:5: note: template<class _Iterator> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&)
     operator-(const move_iterator<_Iterator>& __x,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1128:5: note:   template argument deduction/substitution failed:
0_0_21377925_28386.cpp:64:8: note:   'mat' is not derived from 'const std::move_iterator<_Iterator>'
   ma=A-B;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_21377925_28386.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:351:5: note: template<class _Tp> std::complex<_Tp> std::operator-(const std::complex<_Tp>&, const std::complex<_Tp>&)
     operator-(const complex<_Tp>& __x, const complex<_Tp>& __y)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:351:5: note:   template argument deduction/substitution failed:
0_0_21377925_28386.cpp:64:8: note:   'mat' is not derived from 'const std::complex<_Tp>'
   ma=A-B;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_21377925_28386.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:360:5: note: template<class _Tp> std::complex<_Tp> std::operator-(const std::complex<_Tp>&, const _Tp&)
     operator-(const complex<_Tp>& __x, const _Tp& __y)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:360:5: note:   template argument deduction/substitution failed:
0_0_21377925_28386.cpp:64:8: note:   'mat' is not derived from 'const std::complex<_Tp>'
   ma=A-B;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_21377925_28386.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:369:5: note: template<class _Tp> std::complex<_Tp> std::operator-(const _Tp&, const std::complex<_Tp>&)
     operator-(const _Tp& __x, const complex<_Tp>& __y)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:369:5: note:   template argument deduction/substitution failed:
0_0_21377925_28386.cpp:64:8: note:   'mat' is not derived from 'const std::complex<_Tp>'
   ma=A-B;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_21377925_28386.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:446:5: note: template<class _Tp> std::complex<_Tp> std::operator-(const std::complex<_Tp>&)
     operator-(const complex<_Tp>& __x)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:446:5: note:   template argument deduction/substitution failed:
0_0_21377925_28386.cpp:64:8: note:   'mat' is not derived from 'const std::complex<_Tp>'
   ma=A-B;
        ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/vector:65:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/random.h:34,
                 from D:/HDOJ/Co


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