CODEWITHSUNDEEP
c++qtoverloading
Joe Jankowiak
Joe Jankowiak

Reputation: 1159

QT QtConcurrent run with overloaded class function

I have a class that I use to compress files into different formats. I'm trying to use QtConcurrent to run the compression in the background. With this I have two functions:

  1. Takes file path as a string and compression format
  2. Takes a vector of file paths and compression format

Issue is I'm getting issues with QtConcurrent not knowing which overloaded function to use. I read this stackoverflow which showed using static_cast to explicitly state which method to use. I'm getting stuck with the syntax though since my functions are class functions and not static methods. Can I even use static_cast for this considering these are not static methods?

How I'm calling run:

CompressFile compressor(&m_sysLog); 
QVector<QString> files;     
CompressFormat format((CompressFormat)pMsgCast->get_format()); 
QtConcurrent::run(&compressor, &CompressFile::compress, files, format);

Header for compression class

class CompressFile : public QObject
{
    Q_OBJECT
public:

...

bool compress(QString strFileName, CompressFormat format);            
bool compress(QVector<QString> strFileList, CompressFormat format);

...
}

If I remove one of the compress functions it compiles so I know I've narrowed my issue down to this.

FileCompressor.cpp:100:74: note: types ‘T (Class::)(Param1, Param2, Param3, Param4, Param5)const’ and ‘bool (CompressFile::)(QString, CompressFormat)’ have incompatible cv-qualifiers FileCompressor.cpp:100:74: note: could not resolve address from overloaded function ‘& CompressFile::compress’

Upvotes: 1

Views: 357

Answers (1)

G.M.
G.M.

Reputation: 12909

As per the comment, you can use a static_cast to disambiguate between the various overloads...

QtConcurrent::run(&compressor,
                  static_cast<bool(CompressFile::*)(QVector<QString>, CompressFormat)>(&CompressFile::compress),
                  files,
                  format);

Upvotes: 2

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