Mixing
Error when using overloaded output to stream operator <<
I wrote the function overload to display text in textEdit as in a stream, but I can’t understated how to use it now. Since functions is compiled but not compiled when used it.
//*.h
class MainWin : public QWidget
{
Q_OBJECT
public:
explicit MainWin(QWidget *parent = nullptr);
~MainWin();
friend MainWin *operator<<(MainWin *out,const QString &str);
private:
void showInConsole(const QString &str);
Ui::MainWin *ui;
};
//*.cpp
MainWin *operator<<(MainWin *out,const QString &str)
{
out.showInConsole(str);
return out;
}
Compilation function is successful.
But when trying to write and use an next code:
//main.cpp
MainWin *mW = new MainWin;
mW << "Some text";//<< QString("Some text") the same
It gives me the error:
CurrentSession.cpp:45: error: invalid operands of types 'MainWin*' and
'const char [4]' to binary 'operator<<'
mW << "str";
^
c++ qt
asked Jan 2 at 3:13
VladVlad
84
add a comment |
I wrote the function overload to display text in textEdit as in a stream, but I can’t understated how to use it now. Since functions is compiled but not compiled when used it.
//*.h
class MainWin : public QWidget
{
Q_OBJECT
public:
explicit MainWin(QWidget *parent = nullptr);
~MainWin();
friend MainWin *operator<<(MainWin *out,const QString &str);
private:
void showInConsole(const QString &str);
Ui::MainWin *ui;
};
//*.cpp
MainWin *operator<<(MainWin *out,const QString &str)
{
out.showInConsole(str);
return out;
}
Compilation function is successful.
But when trying to write and use an next code:
//main.cpp
MainWin *mW = new MainWin;
mW << "Some text";//<< QString("Some text") the same
It gives me the error:
CurrentSession.cpp:45: error: invalid operands of types 'MainWin*' and
'const char [4]' to binary 'operator<<'
mW << "str";
^
c++ qt
asked Jan 2 at 3:13
VladVlad
84
usemW << QString("Some text");
– eyllanesc
Jan 2 at 3:16
Or defineMainWin* operator<<(MainWin *out, const char* cstr)
– aybassiouny
Jan 2 at 3:20
2
Related: https://stackoverflow.com/questions/6171630/why-isnt-operator-overloading-for-pointers-allowed-to-work
– super
Jan 2 at 4:28
It should beout->showInConsole(str);
– tunglt
Jan 2 at 9:11
add a comment |
I wrote the function overload to display text in textEdit as in a stream, but I can’t understated how to use it now. Since functions is compiled but not compiled when used it.
//*.h
class MainWin : public QWidget
{
Q_OBJECT
public:
explicit MainWin(QWidget *parent = nullptr);
~MainWin();
friend MainWin *operator<<(MainWin *out,const QString &str);
private:
void showInConsole(const QString &str);
Ui::MainWin *ui;
};
//*.cpp
MainWin *operator<<(MainWin *out,const QString &str)
{
out.showInConsole(str);
return out;
}
Compilation function is successful.
But when trying to write and use an next code:
//main.cpp
MainWin *mW = new MainWin;
mW << "Some text";//<< QString("Some text") the same
It gives me the error:
CurrentSession.cpp:45: error: invalid operands of types 'MainWin*' and
'const char [4]' to binary 'operator<<'
mW << "str";
^
c++ qt
asked Jan 2 at 3:13
VladVlad
84
I wrote the function overload to display text in textEdit as in a stream, but I can’t understated how to use it now. Since functions is compiled but not compiled when used it.
//*.h
class MainWin : public QWidget
{
Q_OBJECT
public:
explicit MainWin(QWidget *parent = nullptr);
~MainWin();
friend MainWin *operator<<(MainWin *out,const QString &str);
private:
void showInConsole(const QString &str);
Ui::MainWin *ui;
};
//*.cpp
MainWin *operator<<(MainWin *out,const QString &str)
{
out.showInConsole(str);
return out;
}
Compilation function is successful.
But when trying to write and use an next code:
//main.cpp
MainWin *mW = new MainWin;
mW << "Some text";//<< QString("Some text") the same
It gives me the error:
CurrentSession.cpp:45: error: invalid operands of types 'MainWin*' and
'const char [4]' to binary 'operator<<'
mW << "str";
^
c++ qt
c++ qt
asked Jan 2 at 3:13
VladVlad
84
asked Jan 2 at 3:13
VladVlad
84
edited Jan 2 at 3:57
Vlad
asked Jan 2 at 3:13
VladVlad
84
asked Jan 2 at 3:13
VladVlad
84
asked Jan 2 at 3:13
VladVlad
84
84
usemW << QString("Some text");
– eyllanesc
Jan 2 at 3:16
Or defineMainWin* operator<<(MainWin *out, const char* cstr)
– aybassiouny
Jan 2 at 3:20
2
Related: https://stackoverflow.com/questions/6171630/why-isnt-operator-overloading-for-pointers-allowed-to-work
– super
Jan 2 at 4:28
It should beout->showInConsole(str);
– tunglt
Jan 2 at 9:11
add a comment |
usemW << QString("Some text");
– eyllanesc
Jan 2 at 3:16
Or defineMainWin* operator<<(MainWin *out, const char* cstr)
– aybassiouny
Jan 2 at 3:20
2
Related: https://stackoverflow.com/questions/6171630/why-isnt-operator-overloading-for-pointers-allowed-to-work
– super
Jan 2 at 4:28
It should beout->showInConsole(str);
– tunglt
Jan 2 at 9:11
use
mW << QString("Some text");– eyllanesc
Jan 2 at 3:16
use
mW << QString("Some text");– eyllanesc
Jan 2 at 3:16
Or define
MainWin* operator<<(MainWin *out, const char* cstr)– aybassiouny
Jan 2 at 3:20
Or define
MainWin* operator<<(MainWin *out, const char* cstr)– aybassiouny
Jan 2 at 3:20
2
2
Related: https://stackoverflow.com/questions/6171630/why-isnt-operator-overloading-for-pointers-allowed-to-work
– super
Jan 2 at 4:28
Related: https://stackoverflow.com/questions/6171630/why-isnt-operator-overloading-for-pointers-allowed-to-work
– super
Jan 2 at 4:28
It should be
out->showInConsole(str);– tunglt
Jan 2 at 9:11
It should be
out->showInConsole(str);– tunglt
Jan 2 at 9:11
add a comment |
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use
mW << QString("Some text");– eyllanesc
Jan 2 at 3:16
Or define
MainWin* operator<<(MainWin *out, const char* cstr)– aybassiouny
Jan 2 at 3:20
2
Related: https://stackoverflow.com/questions/6171630/why-isnt-operator-overloading-for-pointers-allowed-to-work
– super
Jan 2 at 4:28
It should be
out->showInConsole(str);– tunglt
Jan 2 at 9:11