Templates question

Kofr

this is a function prototype

template<class ReturnType> 
ReturnType getValue(const QString &t_tableName, const QString &t_columnName)

Here I am calling it getValue<QString>("user", "name");

that is the error I get

error: no matching function for call to 'PersistantStorageSyncWorker::getValue(const char [5], const char [5]) const' 
return getValue<QString>("user", "name"); 
^

What do I need to fix to make it work propertly?

jsulm

@Kofr Works for me. What compiler do you use?
You could try to pass QString instances explicitly as parameters.
Also is template<class ReturnType> ReturnType getValue(const QString &t_tableName, const QString &t_columnName) defined in PersistantStorageSyncWorker namespace?

koahnig

@Kofr

Did you note that there is a difference in 'const' within your post?

@Kofr said in Templates question:

this is a function prototype

template<class ReturnType> 
ReturnType getValue(const QString &t_tableName, const QString &t_columnName)

Assuming that this is part of your class declaration, you would need:

template<class ReturnType> 
ReturnType getValue(const QString &t_tableName, const QString &t_columnName) const;

Also this could make a difference, but do not think that it is required.

return getValue<QString>( QStringLiteral("user"), QStringLiteral("name"));

Kofr

the problem was with constantness