I have two classes TempFileand Year. TempFileis getting a .txt file with temperatures of the last 130 years. The constructor reads this file and store the data in a std::vector<Year>. Now I want to add a sort function, that shows me the average temperature of every year in descending order. But when I make a structto define my compare (third parameter in std::sort) I am getting too many errors. I´ve also tried to overload the >-operator. Didn't work, too.
我有两个班。tempfilefileis正在获得一个.txt文件，其温度达到了过去130年的水平。构造函数读取这个文件并将数据存储在std::vector
class TempFile {
public:
TempFile(std::string temp_file); // read from .txt file and push_back() the data into std::vector<Year> _years.
//The vector and constructor are working fine.
int get_number_years() const;
std::vector<Year> get_vector() const;
void sort_descending() const;
private:
std::vector<Year> _years;
struct descending
{
bool operator() (const Year& y1, const Year& y2)
{
return (y1.get_average_temp() > y2.get_average_temp());
}
} temp_descending;
};
int TempFile::get_number_years() const
{
return _years.size();
}
std::vector<Year> TempFile::get_vector() const
{
return _years;
}
void TempFile::sort_descending() const
{
std::sort(_years.begin(), _years.end(), temp_descending);
}
class Year {
public:
Year(int year, float january, float february, ...);
void print() const;
float get_added_months() const;
float get_average_temp() const;
int get_year() const;
private:
int _year;
float _january, _february, ...; // all months
};
float Year::get_added_months() const
{
return (_januar + _februar + _maerz + _april + _mai + _juni + _juli + _august + _september + _oktober
+ _november + _dezember);
}
float Year::get_average_temp() const
{
return (get_added_months() / 12);
}
int Year::get_year() const
{
return _jahreszahl;
}
Here is a snippet of the error messages:
以下是错误消息的片段:
g++ -c -g -MMD -MP -MF "build/Debug/GNU-MacOSX/TempFile.o.d" -o build/Debug/GNU-MacOSX/TempFile.o TempFile.cpp
In file included from TempFile.cpp:8:
In file included from ./TempFile.h:10:
In file included from ./Year.h:10:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/vector:265:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__bit_reference:15:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:625:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/type_traits:3534:9: error: no viable overloaded '='
__x = _VSTD::move(__y);
~~~ ^ ~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3852:17: note: in instantiation of function template specialization 'std::__1::swap<const Year>' requested here
swap(*__first, *__last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:4037:5: note: in instantiation of function template specialization 'std::__1::__sort<TempFile::absteigend &, const Year *>' requested here
__sort<_Comp_ref>(__first, __last, __comp);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:4071:12: note: in instantiation of function template specialization 'std::__1::sort<const Year *, TempFile::absteigend &>' requested here
_VSTD::sort<_Tp*, _Comp_ref>(__first.base(), __last.base(), __comp);
^
TempFile.cpp:102:10: note: in instantiation of function template specialization 'std::__1::sort<const Year, TempFile::absteigend>' requested here
std::sort(_years.begin(), _years.end(), temp_absteigend);
^
./Year.h:13:7: note: candidate function (the implicit copy assignment operator) not viable: 'this' argument has type 'const Year', but method is not marked const
class Year {
^
In file included from TempFile.cpp:8:
In file included from ./TempFile.h:10:
In file included from ./Year.h:10:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:218:1: note: candidate template ignored: could not match '_Tp [_Np]' against 'const Year'
swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:456:1: note: candidate template ignored: could not match 'pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2385:1: note: candidate template ignored: could not match '__compressed_pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(__compressed_pair<_T1, _T2>& __x, __compressed_pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2874:1: note: candidate template ignored: could not match 'unique_ptr<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(unique_ptr<_Tp, _Dp>& __x, unique_ptr<_Tp, _Dp>& __y) _NOEXCEPT {__x.swap(__y);}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:4861:1: note: candidate template ignored: could not match 'shared_ptr<type-parameter-0-0>' against 'const Year'
swap(shared_ptr<_Tp>& __x, shared_ptr<_Tp>& __y) _NOEXCEPT
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:5150:1: note: candidate template ignored: could not match 'weak_ptr<type-parameter-0-0>' against 'const Year'
swap(weak_ptr<_Tp>& __x, weak_ptr<_Tp>& __y) _NOEXCEPT
^
In file included from TempFile.cpp:8:
In file included from ./TempFile.h:10:
In file included from ./Year.h:10:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/vector:265:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__bit_reference:15:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3621:5: error: no matching function for call to 'swap'
swap(*__x, *__y); // x > y && y <= z
^~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/type_traits:3530:1: note: candidate template ignored: substitution failure [with _Tp = const Year]
swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value &&
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:218:1: note: candidate template ignored: could not match '_Tp [_Np]' against 'const Year'
swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:456:1: note: candidate template ignored: could not match 'pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2385:1: note: candidate template ignored: could not match '__compressed_pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(__compressed_pair<_T1, _T2>& __x, __compressed_pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2874:1: note: candidate template ignored: could not match 'unique_ptr<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(unique_ptr<_Tp, _Dp>& __x, unique_ptr<_Tp, _Dp>& __y) _NOEXCEPT {__x.swap(__y);}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:4071:12: note: in instantiation of function template specialization 'std::__1::sort<const Year *, TempFile::absteigend &>' requested here
_VSTD::sort<_Tp*, _Comp_ref>(__first.base(), __last.base(), __comp);
^
TempFile.cpp:102:10: note: in instantiation of function template specialization 'std::__1::sort<const Year, TempFile::absteigend>' requested here
std::sort(_years.begin(), _years.end(), temp_absteigend);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3598:1: note: candidate template ignored: substitution failure [with _Compare = TempFile::absteigend &, _ForwardIterator = const Year *]
__sort3(_ForwardIterator __x, _ForwardIterator __y, _ForwardIterator __z, _Compare __c)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3641:9: error: no matching function for call to 'swap'
swap(*__x3, *__x4);
^~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/type_traits:3530:1: note: candidate template ignored: substitution failure [with _Tp = const Year]
swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value &&
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:218:1: note: candidate template ignored: could not match '_Tp [_Np]' against 'const Year'
swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:456:1: note: candidate template ignored: could not match 'pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2385:1: note: candidate template ignored: could not match '__compressed_pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(__compressed_pair<_T1, _T2>& __x, __compressed_pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2874:1: note: candidate template ignored: could not match 'unique_ptr<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(unique_ptr<_Tp, _Dp>& __x, unique_ptr<_Tp, _Dp>& __y) _NOEXCEPT {__x.swap(__y);}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:4861:1: note: candidate template ignored: could not match 'shared_ptr<type-parameter-0-0>' against 'const Year'
swap(shared_ptr<_Tp>& __x, shared_ptr<_Tp>& __y) _NOEXCEPT
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:5150:1: note: candidate template ignored: could not match 'weak_ptr<type-parameter-0-0>' against 'const Year'
swap(weak_ptr<_Tp>& __x, weak_ptr<_Tp>& __y) _NOEXCEPT
^
In file included from TempFile.cpp:8:
In file included from ./TempFile.h:10:
In file included from ./Year.h:10:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/vector:265:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__bit_reference:15:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3645:13: error: no matching function for call to 'swap'
swap(*__x2, *__x3);
^~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/type_traits:3530:1: note: candidate template ignored: substitution failure [with _Tp = const Year]
swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value &&
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:218:1: note: candidate template ignored: could not match '_Tp [_Np]' against 'const Year'
swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2385:1: note: candidate template ignored: could not match '__compressed_pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(__compressed_pair<_T1, _T2>& __x, __compressed_pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2874:1: note: candidate template ignored: could not match 'unique_ptr<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(unique_ptr<_Tp, _Dp>& __x, unique_ptr<_Tp, _Dp>& __y) _NOEXCEPT {__x.swap(__y);}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:4861:1: note: candidate template ignored: could not match 'shared_ptr<type-parameter-0-0>' against 'const Year'
swap(shared_ptr<_Tp>& __x, shared_ptr<_Tp>& __y) _NOEXCEPT
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:5150:1: note: candidate template ignored: could not match 'weak_ptr<type-parameter-0-0>' against 'const Year'
swap(weak_ptr<_Tp>& __x, weak_ptr<_Tp>& __y) _NOEXCEPT
^
In file included from TempFile.cpp:8:
In file included from ./TempFile.h:10:
In file included from ./Year.h:10:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/vector:265:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__bit_reference:15:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3671:13: error: no matching function for call to 'swap'
swap(*__x3, *__x4);
^~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/type_traits:3530:1: note: candidate template ignored: substitution failure [with _Tp = const Year]
swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value &&
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:218:1: note: candidate template ignored: could not match '_Tp [_Np]' against 'const Year'
swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:456:1: note: candidate template ignored: could not match 'pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2385:1: note: candidate template ignored: could not match '__compressed_pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(__compressed_pair<_T1, _T2>& __x, __compressed_pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2874:1: note: candidate template ignored: could not match 'unique_ptr<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(unique_ptr<_Tp, _Dp>& __x, unique_ptr<_Tp, _Dp>& __y) _NOEXCEPT {__x.swap(__y);}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:4861:1: note: candidate template ignored: could not match 'shared_ptr<type-parameter-0-0>' against 'const Year'
swap(shared_ptr<_Tp>& __x, shared_ptr<_Tp>& __y) _NOEXCEPT
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:5150:1: note: candidate template ignored: could not match 'weak_ptr<type-parameter-0-0>' against 'const Year'
swap(weak_ptr<_Tp>& __x, weak_ptr<_Tp>& __y) _NOEXCEPT
^
In file included from TempFile.cpp:8:
In file included from ./TempFile.h:10:
In file included from ./Year.h:10:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/vector:265:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__bit_reference:15:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3675:17: error: no matching function for call to 'swap'
swap(*__x2, *__x3);
^~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/type_traits:3530:1: note: candidate template ignored: substitution failure [with _Tp = const Year]
swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value &&
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:218:1: note: candidate template ignored: could not match '_Tp [_Np]' against 'const Year'
swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:456:1: note: candidate template ignored: could not match 'pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2385:1: note: candidate template ignored: could not match '__compressed_pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(__compressed_pair<_T1, _T2>& __x, __compressed_pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2874:1: note: candidate template ignored: could not match 'unique_ptr<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(unique_ptr<_Tp, _Dp>& __x, unique_ptr<_Tp, _Dp>& __y) _NOEXCEPT {__x.swap(__y);}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:4861:1: note: candidate template ignored: could not match 'shared_ptr<type-parameter-0-0>' against 'const Year'
swap(shared_ptr<_Tp>& __x, shared_ptr<_Tp>& __y) _NOEXCEPT
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:5150:1: note: candidate template ignored: could not match 'weak_ptr<type-parameter-0-0>' against 'const Year'
swap(weak_ptr<_Tp>& __x, weak_ptr<_Tp>& __y) _NOEXCEPT
^
In file included from TempFile.cpp:8:
In file included from ./TempFile.h:10:
In file included from ./Year.h:10:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/vector:265:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__bit_reference:15:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3679:21: error: no matching function for call to 'swap'
swap(*__x1, *__x2);
^~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/type_traits:3530:1: note: candidate template ignored: substitution failure [with _Tp = const Year]
swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value &&
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:218:1: note: candidate template ignored: could not match '_Tp [_Np]' against 'const Year'
swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/utility:456:1: note: candidate template ignored: could not match 'pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2385:1: note: candidate template ignored: could not match '__compressed_pair<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(__compressed_pair<_T1, _T2>& __x, __compressed_pair<_T1, _T2>& __y)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:2874:1: note: candidate template ignored: could not match 'unique_ptr<type-parameter-0-0, type-parameter-0-1>' against 'const Year'
swap(unique_ptr<_Tp, _Dp>& __x, unique_ptr<_Tp, _Dp>& __y) _NOEXCEPT {__x.swap(__y);}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:4861:1: note: candidate template ignored: could not match 'shared_ptr<type-parameter-0-0>' against 'const Year'
swap(shared_ptr<_Tp>& __x, shared_ptr<_Tp>& __y) _NOEXCEPT
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/memory:5150:1: note: candidate template ignored: could not match 'weak_ptr<type-parameter-0-0>' against 'const Year'
swap(weak_ptr<_Tp>& __x, weak_ptr<_Tp>& __y) _NOEXCEPT
^
In file included from TempFile.cpp:8:
In file included from ./TempFile.h:10:
In file included from ./Year.h:10:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/vector:265:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__bit_reference:15:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3729:5: error: no matching function for call to '__sort3'
__sort3<_Compare>(__first, __first+1, __j, __comp);
^~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3866:20: note: in instantiation of function template specialization 'std::__1::__insertion_sort_3<TempFile::absteigend &, const Year *>' requested here
_VSTD::__insertion_sort_3<_Compare>(__first, __last, __comp);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:4037:5: note: in instantiation of function template specialization 'std::__1::__sort<TempFile::absteigend &, const Year *>' requested here
__sort<_Comp_ref>(__first, __last, __comp);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:4071:12: note: in instantiation of function template specialization 'std::__1::sort<const Year *, TempFile::absteigend &>' requested here
_VSTD::sort<_Tp*, _Comp_ref>(__first.base(), __last.base(), __comp);
^
TempFile.cpp:102:10: note: in instantiation of function template specialization 'std::__1::sort<const Year, TempFile::absteigend>' requested here
std::sort(_years.begin(), _years.end(), temp_absteigend);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3598:1: note: candidate template ignored: substitution failure [with _Compare = TempFile::absteigend &, _ForwardIterator = const Year *]
__sort3(_ForwardIterator __x, _ForwardIterator __y, _ForwardIterator __z, _Compare __c)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3739:22: error: no viable overloaded '='
*__j = _VSTD::move(*__k);
~~~~ ^ ~~~~~~~~~~~~~~~~~
./Year.h:13:7: note: candidate function (the implicit copy assignment operator) not viable: 'this' argument has type 'const Year', but method is not marked const
class Year {
^
In file included from TempFile.cpp:8:
In file included from ./TempFile.h:10:
In file included from ./Year.h:10:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/vector:265:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__bit_reference:15:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/algorithm:3742:18: error: no viable overloaded '='
*__j = _VSTD::move(__t);
~~~~ ^ ~~~~~~~~~~~~~~~~
./Year.h:13:7: note: candidate function (the implicit copy assignment operator) not viable: 'this' argument has type 'const Year', but method is not marked const
class Year {
^
1 个解决方案
#1
5
TempFile::sort_descending() is marked const, while you're trying to modify the _years member via std::sort.
TempFile:: sort_down()是标记const，当您试图通过std来修改_years成员::sort。
Removing the const specifier from the function's signature or making _years a mutable will solve this problem.
从函数的签名中删除const说明符或使_years为可变将解决这个问题。
#1
5
TempFile::sort_descending() is marked const, while you're trying to modify the _years member via std::sort.
TempFile:: sort_down()是标记const，当您试图通过std来修改_years成员::sort。
Removing the const specifier from the function's signature or making _years a mutable will solve this problem.
从函数的签名中删除const说明符或使_years为可变将解决这个问题。