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View Compilation Error

0_0_14944206_15944.cpp: In member function 'point line::zhao(double)':
0_0_14944206_15944.cpp:82:15: error: no match for 'operator+' (operand types are 'point' and 'point')
   return dian + xl*t;
               ^
0_0_14944206_15944.cpp:82:15: note: candidates are:
0_0_14944206_15944.cpp:36:8: note: point point::operator+(point&)
  point operator + (point &a){
        ^
0_0_14944206_15944.cpp:36:8: note:   no known conversion for argument 1 from 'point' to 'point&'
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++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_14944206_15944.cpp:9:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:334:5: note: template<class _Iterator> std::reverse_iterator<_Iterator> std::operator+(typename std::reverse_iterator<_Iterator>::difference_type, const std::reverse_iterator<_Iterator>&)
     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:334:5: note:   template argument deduction/substitution failed:
0_0_14944206_15944.cpp:82:20: note:   'point' is not derived from 'const std::reverse_iterator<_Iterator>'
   return dian + xl*t;
                    ^
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++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_14944206_15944.cpp:9:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1135:5: note: template<class _Iterator> std::move_iterator<_Iterator> std::operator+(typename std::move_iterator<_Iterator>::difference_type, const std::move_iterator<_Iterator>&)
     operator+(typename move_iterator<_Iterator>::difference_type __n,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_iterator.h:1135:5: note:   template argument deduction/substitution failed:
0_0_14944206_15944.cpp:82:20: note:   'point' is not derived from 'const std::move_iterator<_Iterator>'
   return dian + xl*t;
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_14944206_15944.cpp:9:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2384:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2384:5: note:   template argument deduction/substitution failed:
0_0_14944206_15944.cpp:82:20: note:   'point' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
   return dian + xl*t;
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:53:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_14944206_15944.cpp:9:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.tcc:692:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(const _CharT* __lhs,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.tcc:692:5: note:   template argument deduction/substitution failed:
0_0_14944206_15944.cpp:82:20: note:   mismatched types 'const _CharT*' and 'point'
   return dian + xl*t;
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:53:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_14944206_15944.cpp:9:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.tcc:708:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(_CharT, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator+(_CharT __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.tcc:708:5: note:   template argument deduction/substitution failed:
0_0_14944206_15944.cpp:82:20: note:   'point' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
   return dian + xl*t;
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_14944206_15944.cpp:9:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2421:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2421:5: note:   template argument deduction/substitution failed:
0_0_14944206_15944.cpp:82:20: note:   'point' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
   return dian + xl*t;
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_14944206_15944.cpp:9:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2437:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(const std::basic_string<_CharT, _Traits, _Alloc>&, _CharT)
     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2437:5: note:   template argument deduction/substitution failed:
0_0_14944206_15944.cpp:82:20: note:   'point' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
   return dian + xl*t;
                    ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/locale_classes.h:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/ios_base.h:41,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:42,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39,
                 from 0_0_14944206_15944.cpp:9:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:2449:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_string<_CharT, _Traits, _Alloc> std::operator+(std::basic_string<_CharT, _Traits, _Alloc>&&, const std::basic_string<_CharT, _Traits


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