Class member Boost multiThreading recursion

dij (1)
Hi everybody, I have the following situation:
This code compiling and runing Ok:
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#include <iostream>

class ScanFolderTree
{
public:
  void ScanFolder(int iLevel)
  {
    std::cout << "iLevel = " << iLevel << std::endl;
    if (iLevel > 10) return;
    iLevel++;
    ScanFolder(iLevel);
  }
};

int main()
{
  ScanFolderTree sft;
  sft.ScanFolder(0);
  return 0;
}



iLevel = 0
iLevel = 1
iLevel = 2
iLevel = 3
iLevel = 4
iLevel = 5
iLevel = 6
iLevel = 7
iLevel = 8
iLevel = 9
iLevel = 10
iLevel = 11


The next version of above simple program compile
with error like this:
scanFsMltThrd.cpp: In member function ‘void ScanFolderTree::ScanFolder(int)’:
scanFsMltThrd.cpp:16:49: error: no matching function for call to ‘boost::thread_group::create_thread(<unresolved overloaded function type>, int&)’

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#include <iostream>
#include <boost/thread/thread.hpp>

class ScanFolderTree
{
public:
  void ScanFolder(int iLevel)
  {

    std::cout << "iLevel = " << iLevel << std::endl;
    if (iLevel > 10) return;
    iLevel++;
    //ScanFolder(iLevel);
    //thrds.create_thread(&ScanFolderTree::ScanFolder, iLevel);
    //thrds.create_thread(ScanFolder, iLevel);
    thrds.create_thread(this->ScanFolder, iLevel);
  }

  void JoinAll()
  {
    thrds.join_all();
  }

private:
boost::thread_group thrds;
};

int main()
{
  ScanFolderTree sft;
  sft.ScanFolder(0);
  sft.JoinAll();
  return 0;
}


Whoever has experience with this, thanks for any insight.
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