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Change only a specific Default Parameter on a function
2019 Community Moderator ElectionUse of 'const' for function parametersUse 'class' or 'typename' for template parameters?Why can templates only be implemented in the header file?Why do we need virtual functions in C++?Where to put default parameter value in C++?Why does changing 0.1f to 0 slow down performance by 10x?QInputDialog Parameter DefaultsAre the days of passing const std::string & as a parameter over?Qt: How to call a set to a toString, return in get function and testing a boolCan`t overload the operator << for a my own class
I'm using qt
and I am trying to use the QInputDialog::getText()
function to get input from the user, from the Documentation the definition of the function is:
QString QInputDialog::getText(QWidget * parent, const QString & title, const QString & label, QLineEdit::EchoMode mode = QLineEdit::Normal, const QString & text = QString(), bool * ok = 0, Qt::WindowFlags flags = 0, Qt::InputMethodHints inputMethodHints = Qt::ImhNone)
and here is my code:
bool ok=0;
newAddress = QInputDialog::getText(0,"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)"
,&ok);
but I get the Error:
error: no matching function for call to 'QInputDialog::getText(int, const char [29], const char [80], bool*)'
,&ok);
^
but when I pass in all the arguments before the *ok
argument like:
bool ok=0;
newAddress = QInputDialog::getText(0,"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)"
,QLineEdit::Normal,
QString(),&ok);
it works.
I really don't understand why cant I just change the default parameter I want and leave the rest as default?.
c++ qt qt5
add a comment |
I'm using qt
and I am trying to use the QInputDialog::getText()
function to get input from the user, from the Documentation the definition of the function is:
QString QInputDialog::getText(QWidget * parent, const QString & title, const QString & label, QLineEdit::EchoMode mode = QLineEdit::Normal, const QString & text = QString(), bool * ok = 0, Qt::WindowFlags flags = 0, Qt::InputMethodHints inputMethodHints = Qt::ImhNone)
and here is my code:
bool ok=0;
newAddress = QInputDialog::getText(0,"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)"
,&ok);
but I get the Error:
error: no matching function for call to 'QInputDialog::getText(int, const char [29], const char [80], bool*)'
,&ok);
^
but when I pass in all the arguments before the *ok
argument like:
bool ok=0;
newAddress = QInputDialog::getText(0,"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)"
,QLineEdit::Normal,
QString(),&ok);
it works.
I really don't understand why cant I just change the default parameter I want and leave the rest as default?.
c++ qt qt5
add a comment |
I'm using qt
and I am trying to use the QInputDialog::getText()
function to get input from the user, from the Documentation the definition of the function is:
QString QInputDialog::getText(QWidget * parent, const QString & title, const QString & label, QLineEdit::EchoMode mode = QLineEdit::Normal, const QString & text = QString(), bool * ok = 0, Qt::WindowFlags flags = 0, Qt::InputMethodHints inputMethodHints = Qt::ImhNone)
and here is my code:
bool ok=0;
newAddress = QInputDialog::getText(0,"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)"
,&ok);
but I get the Error:
error: no matching function for call to 'QInputDialog::getText(int, const char [29], const char [80], bool*)'
,&ok);
^
but when I pass in all the arguments before the *ok
argument like:
bool ok=0;
newAddress = QInputDialog::getText(0,"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)"
,QLineEdit::Normal,
QString(),&ok);
it works.
I really don't understand why cant I just change the default parameter I want and leave the rest as default?.
c++ qt qt5
I'm using qt
and I am trying to use the QInputDialog::getText()
function to get input from the user, from the Documentation the definition of the function is:
QString QInputDialog::getText(QWidget * parent, const QString & title, const QString & label, QLineEdit::EchoMode mode = QLineEdit::Normal, const QString & text = QString(), bool * ok = 0, Qt::WindowFlags flags = 0, Qt::InputMethodHints inputMethodHints = Qt::ImhNone)
and here is my code:
bool ok=0;
newAddress = QInputDialog::getText(0,"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)"
,&ok);
but I get the Error:
error: no matching function for call to 'QInputDialog::getText(int, const char [29], const char [80], bool*)'
,&ok);
^
but when I pass in all the arguments before the *ok
argument like:
bool ok=0;
newAddress = QInputDialog::getText(0,"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)"
,QLineEdit::Normal,
QString(),&ok);
it works.
I really don't understand why cant I just change the default parameter I want and leave the rest as default?.
c++ qt qt5
c++ qt qt5
edited 19 hours ago
Makhele Sabata
asked yesterday
Makhele SabataMakhele Sabata
8916
8916
add a comment |
add a comment |
3 Answers
3
active
oldest
votes
When you pass a value for a particular parameter that has a default argument, you have to pass values for all the default parameters before it. Otherwise, the value you have passed will be taken as the value for the first default parameter.
So you have to do this:
newAddress = QInputDialog::getText(
0,
"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)",
QLineEdit::Normal,
QString(),
&ok);
You can leave out passing values for the parameters after bool *
parameter.
The C++ standard states in [dcl.fct.default]/1
Default arguments will be used in calls where trailing arguments are missing.
I worked with Python when i started learning programming, and it i had this functionality where you could pass the arguments by name. it would be nice if they had something like that in C++. Thanks for the answer I wasn't aware of the trailing arguments issue.
– Makhele Sabata
21 hours ago
You are welcome.
– P.W
21 hours ago
add a comment |
In C++ you can only use (one or multiple) default parameters at the end of the parameter list. If you omit parameters in the middle, the compiler has no way of knowing, which argument belongs to which parameter. Therefore you have to specify the default parameters QLineEdit::Normal and QString()
manually before passing &ok
.
In your not working case the compiler tries to match your bool pointer to the next type in the parameter list, which is QLineEdit::EchoMode
and therefore not compatible.
add a comment |
the error is beacuse of the optional paramteres:
QString QInputDialog::getText(
QWidget * parent,
const QString & title,
const QString & label,
QLineEdit::EchoMode mode = QLineEdit::Normal,
const QString& text = QString(),
bool * ok = 0,
Qt::WindowFlags flags = 0,
Qt::InputMethodHints inputMethodHints = Qt::ImhNone)
QInputDialog::getText(
0,
"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)",
--> QLineEdit::EchoMode ??
--> QString& text ??
&ok);
if you set one optional parameter, you have to set all the optional paramteters to the left of that, in your case QLineEdit::EchoMode and QString& text
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
When you pass a value for a particular parameter that has a default argument, you have to pass values for all the default parameters before it. Otherwise, the value you have passed will be taken as the value for the first default parameter.
So you have to do this:
newAddress = QInputDialog::getText(
0,
"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)",
QLineEdit::Normal,
QString(),
&ok);
You can leave out passing values for the parameters after bool *
parameter.
The C++ standard states in [dcl.fct.default]/1
Default arguments will be used in calls where trailing arguments are missing.
I worked with Python when i started learning programming, and it i had this functionality where you could pass the arguments by name. it would be nice if they had something like that in C++. Thanks for the answer I wasn't aware of the trailing arguments issue.
– Makhele Sabata
21 hours ago
You are welcome.
– P.W
21 hours ago
add a comment |
When you pass a value for a particular parameter that has a default argument, you have to pass values for all the default parameters before it. Otherwise, the value you have passed will be taken as the value for the first default parameter.
So you have to do this:
newAddress = QInputDialog::getText(
0,
"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)",
QLineEdit::Normal,
QString(),
&ok);
You can leave out passing values for the parameters after bool *
parameter.
The C++ standard states in [dcl.fct.default]/1
Default arguments will be used in calls where trailing arguments are missing.
I worked with Python when i started learning programming, and it i had this functionality where you could pass the arguments by name. it would be nice if they had something like that in C++. Thanks for the answer I wasn't aware of the trailing arguments issue.
– Makhele Sabata
21 hours ago
You are welcome.
– P.W
21 hours ago
add a comment |
When you pass a value for a particular parameter that has a default argument, you have to pass values for all the default parameters before it. Otherwise, the value you have passed will be taken as the value for the first default parameter.
So you have to do this:
newAddress = QInputDialog::getText(
0,
"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)",
QLineEdit::Normal,
QString(),
&ok);
You can leave out passing values for the parameters after bool *
parameter.
The C++ standard states in [dcl.fct.default]/1
Default arguments will be used in calls where trailing arguments are missing.
When you pass a value for a particular parameter that has a default argument, you have to pass values for all the default parameters before it. Otherwise, the value you have passed will be taken as the value for the first default parameter.
So you have to do this:
newAddress = QInputDialog::getText(
0,
"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)",
QLineEdit::Normal,
QString(),
&ok);
You can leave out passing values for the parameters after bool *
parameter.
The C++ standard states in [dcl.fct.default]/1
Default arguments will be used in calls where trailing arguments are missing.
edited 23 hours ago
answered yesterday
P.WP.W
16k31455
16k31455
I worked with Python when i started learning programming, and it i had this functionality where you could pass the arguments by name. it would be nice if they had something like that in C++. Thanks for the answer I wasn't aware of the trailing arguments issue.
– Makhele Sabata
21 hours ago
You are welcome.
– P.W
21 hours ago
add a comment |
I worked with Python when i started learning programming, and it i had this functionality where you could pass the arguments by name. it would be nice if they had something like that in C++. Thanks for the answer I wasn't aware of the trailing arguments issue.
– Makhele Sabata
21 hours ago
You are welcome.
– P.W
21 hours ago
I worked with Python when i started learning programming, and it i had this functionality where you could pass the arguments by name. it would be nice if they had something like that in C++. Thanks for the answer I wasn't aware of the trailing arguments issue.
– Makhele Sabata
21 hours ago
I worked with Python when i started learning programming, and it i had this functionality where you could pass the arguments by name. it would be nice if they had something like that in C++. Thanks for the answer I wasn't aware of the trailing arguments issue.
– Makhele Sabata
21 hours ago
You are welcome.
– P.W
21 hours ago
You are welcome.
– P.W
21 hours ago
add a comment |
In C++ you can only use (one or multiple) default parameters at the end of the parameter list. If you omit parameters in the middle, the compiler has no way of knowing, which argument belongs to which parameter. Therefore you have to specify the default parameters QLineEdit::Normal and QString()
manually before passing &ok
.
In your not working case the compiler tries to match your bool pointer to the next type in the parameter list, which is QLineEdit::EchoMode
and therefore not compatible.
add a comment |
In C++ you can only use (one or multiple) default parameters at the end of the parameter list. If you omit parameters in the middle, the compiler has no way of knowing, which argument belongs to which parameter. Therefore you have to specify the default parameters QLineEdit::Normal and QString()
manually before passing &ok
.
In your not working case the compiler tries to match your bool pointer to the next type in the parameter list, which is QLineEdit::EchoMode
and therefore not compatible.
add a comment |
In C++ you can only use (one or multiple) default parameters at the end of the parameter list. If you omit parameters in the middle, the compiler has no way of knowing, which argument belongs to which parameter. Therefore you have to specify the default parameters QLineEdit::Normal and QString()
manually before passing &ok
.
In your not working case the compiler tries to match your bool pointer to the next type in the parameter list, which is QLineEdit::EchoMode
and therefore not compatible.
In C++ you can only use (one or multiple) default parameters at the end of the parameter list. If you omit parameters in the middle, the compiler has no way of knowing, which argument belongs to which parameter. Therefore you have to specify the default parameters QLineEdit::Normal and QString()
manually before passing &ok
.
In your not working case the compiler tries to match your bool pointer to the next type in the parameter list, which is QLineEdit::EchoMode
and therefore not compatible.
answered yesterday
AlbertMAlbertM
352210
352210
add a comment |
add a comment |
the error is beacuse of the optional paramteres:
QString QInputDialog::getText(
QWidget * parent,
const QString & title,
const QString & label,
QLineEdit::EchoMode mode = QLineEdit::Normal,
const QString& text = QString(),
bool * ok = 0,
Qt::WindowFlags flags = 0,
Qt::InputMethodHints inputMethodHints = Qt::ImhNone)
QInputDialog::getText(
0,
"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)",
--> QLineEdit::EchoMode ??
--> QString& text ??
&ok);
if you set one optional parameter, you have to set all the optional paramteters to the left of that, in your case QLineEdit::EchoMode and QString& text
add a comment |
the error is beacuse of the optional paramteres:
QString QInputDialog::getText(
QWidget * parent,
const QString & title,
const QString & label,
QLineEdit::EchoMode mode = QLineEdit::Normal,
const QString& text = QString(),
bool * ok = 0,
Qt::WindowFlags flags = 0,
Qt::InputMethodHints inputMethodHints = Qt::ImhNone)
QInputDialog::getText(
0,
"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)",
--> QLineEdit::EchoMode ??
--> QString& text ??
&ok);
if you set one optional parameter, you have to set all the optional paramteters to the left of that, in your case QLineEdit::EchoMode and QString& text
add a comment |
the error is beacuse of the optional paramteres:
QString QInputDialog::getText(
QWidget * parent,
const QString & title,
const QString & label,
QLineEdit::EchoMode mode = QLineEdit::Normal,
const QString& text = QString(),
bool * ok = 0,
Qt::WindowFlags flags = 0,
Qt::InputMethodHints inputMethodHints = Qt::ImhNone)
QInputDialog::getText(
0,
"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)",
--> QLineEdit::EchoMode ??
--> QString& text ??
&ok);
if you set one optional parameter, you have to set all the optional paramteters to the left of that, in your case QLineEdit::EchoMode and QString& text
the error is beacuse of the optional paramteres:
QString QInputDialog::getText(
QWidget * parent,
const QString & title,
const QString & label,
QLineEdit::EchoMode mode = QLineEdit::Normal,
const QString& text = QString(),
bool * ok = 0,
Qt::WindowFlags flags = 0,
Qt::InputMethodHints inputMethodHints = Qt::ImhNone)
QInputDialog::getText(
0,
"Enter an Address to Validate",
"Adress: comma separated (e.g Address line 1, Address line 2, City, Postal Code)",
--> QLineEdit::EchoMode ??
--> QString& text ??
&ok);
if you set one optional parameter, you have to set all the optional paramteters to the left of that, in your case QLineEdit::EchoMode and QString& text
answered yesterday
ΦXocę 웃 Пepeúpa ツΦXocę 웃 Пepeúpa ツ
33.8k113965
33.8k113965
add a comment |
add a comment |
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