[Insight-users] What is the connection between 'SetFileName' and 'itkSetStringMacro'?

[daniel mark]

Hello all:

I have the following code:

typedef   itk::ImageFileReader< InputImageType >  ReaderType;
ReaderType::Pointer   reader = ReaderType::New();
reader->SetFileName( argv[1] );

#ifndef __itkImageFileReader_h
#define __itkImageFileReader_h

  /** Specify the file to read. This is forwarded to the IO instance. */
  itkSetStringMacro(FileName);
  itkGetStringMacro(FileName);

#endif // __itkImageFileReader_h

I try to find where the definition of SetFileName is.

Finally, I got this:

#define itkSetStringMacro(name) virtual void Set##name (const char*
_arg) { if ( _arg && (_arg == this->m_##name) ) { return;} if (_arg) {
this->m_##name = _arg; } else { this->m_##name = ""; }
this->Modified(); }


The above snippet is totally out of my mind.

Can anyone give me what is going on here?
or
Point me to some places where I can find related C++ syntax.

Thank you
-Daniel