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0

I use QHash for a small program.

CompleterData.h

#include <QMap>
#include <QList>
#include <QHash>
#include <QPair>
#include <QVariant>

class CompleterData


public:
 enum class Type
 
 Header, 
 SecondHeader, 
 Data, 
 LastUsed 
 ;

 CompleterData() = default;

 QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> data();
 void setData( QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> &p_data );
 void addData( CompleterData::Type &p_type, QList<QPair<QString, QVariant>> &p_rowData );

private:
 QHash <CompleterData::Type, QList<QPair<QString, QVariant>>> m_data;
;

CompleterData.cpp

QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> CompleterData::data()

 return m_data;


void CompleterData::addData( CompleterData::Type &p_type, QList<QPair<QString, QVariant>> &p_rowData )

 m_data.insert( p_type, p_rowData );


void CompleterData::setData( QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> &p_data )

 m_data = p_data;

I get this error by compiling

Where do I have error in this case. I know this kind of error is posted here so many times, but each case has it own reason and even for this simple case I still can not find the reason why? I use VS 2017.

qt visual-studio-2017 qhash

share|improve this question

asked Mar 8 at 8:06

gnasegnase

11714

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  CompleterData::Type is a scoped enum, and there is no implicit conversion to integer for it. The same is true for non scoped enum types. qHash doesn't know how to calculate hash of your key type.
  
  – vahancho
  Mar 8 at 8:13
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @vahancho: how should I change in this case?
  
  – gnase
  Mar 8 at 8:14
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Two choices: 1) Declare Type enum as non scoped, i.e. enum Type, 2) Declare your hash table as QHash <int, QList<QPair<QString, QVariant>>> and explicitly convert CompleterData::Type to int when you insert a pair into the container, i.e. m_data.insert(static_cast<int>(p_type), p_rowData );. The is a room for improvements in your code, but it's another topic.
  
  – vahancho
  Mar 8 at 8:20
  

  
  
  
  

add a comment | 

0

I use QHash for a small program.

CompleterData.h

#include <QMap>
#include <QList>
#include <QHash>
#include <QPair>
#include <QVariant>

class CompleterData


public:
 enum class Type
 
 Header, 
 SecondHeader, 
 Data, 
 LastUsed 
 ;

 CompleterData() = default;

 QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> data();
 void setData( QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> &p_data );
 void addData( CompleterData::Type &p_type, QList<QPair<QString, QVariant>> &p_rowData );

private:
 QHash <CompleterData::Type, QList<QPair<QString, QVariant>>> m_data;
;

CompleterData.cpp

QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> CompleterData::data()

 return m_data;


void CompleterData::addData( CompleterData::Type &p_type, QList<QPair<QString, QVariant>> &p_rowData )

 m_data.insert( p_type, p_rowData );


void CompleterData::setData( QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> &p_data )

 m_data = p_data;

I get this error by compiling

Where do I have error in this case. I know this kind of error is posted here so many times, but each case has it own reason and even for this simple case I still can not find the reason why? I use VS 2017.

qt visual-studio-2017 qhash

share|improve this question

asked Mar 8 at 8:06

gnasegnase

11714

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  CompleterData::Type is a scoped enum, and there is no implicit conversion to integer for it. The same is true for non scoped enum types. qHash doesn't know how to calculate hash of your key type.
  
  – vahancho
  Mar 8 at 8:13
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @vahancho: how should I change in this case?
  
  – gnase
  Mar 8 at 8:14
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Two choices: 1) Declare Type enum as non scoped, i.e. enum Type, 2) Declare your hash table as QHash <int, QList<QPair<QString, QVariant>>> and explicitly convert CompleterData::Type to int when you insert a pair into the container, i.e. m_data.insert(static_cast<int>(p_type), p_rowData );. The is a room for improvements in your code, but it's another topic.
  
  – vahancho
  Mar 8 at 8:20
  

  
  
  
  

add a comment | 

I use QHash for a small program.

CompleterData.h

#include <QMap>
#include <QList>
#include <QHash>
#include <QPair>
#include <QVariant>

class CompleterData


public:
 enum class Type
 
 Header, 
 SecondHeader, 
 Data, 
 LastUsed 
 ;

 CompleterData() = default;

 QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> data();
 void setData( QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> &p_data );
 void addData( CompleterData::Type &p_type, QList<QPair<QString, QVariant>> &p_rowData );

private:
 QHash <CompleterData::Type, QList<QPair<QString, QVariant>>> m_data;
;

CompleterData.cpp

QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> CompleterData::data()

 return m_data;


void CompleterData::addData( CompleterData::Type &p_type, QList<QPair<QString, QVariant>> &p_rowData )

 m_data.insert( p_type, p_rowData );


void CompleterData::setData( QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> &p_data )

 m_data = p_data;

I get this error by compiling

Where do I have error in this case. I know this kind of error is posted here so many times, but each case has it own reason and even for this simple case I still can not find the reason why? I use VS 2017.

qt visual-studio-2017 qhash

share|improve this question

asked Mar 8 at 8:06

gnasegnase

11714

#include <QMap>
#include <QList>
#include <QHash>
#include <QPair>
#include <QVariant>

class CompleterData


public:
 enum class Type
 
 Header, 
 SecondHeader, 
 Data, 
 LastUsed 
 ;

 CompleterData() = default;

 QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> data();
 void setData( QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> &p_data );
 void addData( CompleterData::Type &p_type, QList<QPair<QString, QVariant>> &p_rowData );

private:
 QHash <CompleterData::Type, QList<QPair<QString, QVariant>>> m_data;
;

QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> CompleterData::data()

 return m_data;


void CompleterData::addData( CompleterData::Type &p_type, QList<QPair<QString, QVariant>> &p_rowData )

 m_data.insert( p_type, p_rowData );


void CompleterData::setData( QHash < CompleterData::Type, QList<QPair<QString, QVariant>>> &p_data )

 m_data = p_data;

share|improve this question

asked Mar 8 at 8:06

gnasegnase

11714

share|improve this question

asked Mar 8 at 8:06

gnasegnase

11714

asked Mar 8 at 8:06

gnasegnase

11714

asked Mar 8 at 8:06

gnasegnase

11714