Add default value for consistency

[malaterre]

No description provided.

[jriesmeier]

What do you mean by "for consistency"? The getOFString() method of derived classes do not use a default value for this parameter.

[malaterre]

@jriesmeier I got inspired by the other calls:

% git grep 'pos = 0'
[...]
dcmdata/include/dcmtk/dcmdata/dcelem.h:    virtual OFCondition getUint8(Uint8 &val, const unsigned long pos = 0);
dcmdata/include/dcmtk/dcmdata/dcelem.h:    virtual OFCondition getSint16(Sint16 &val, const unsigned long pos = 0);
dcmdata/include/dcmtk/dcmdata/dcelem.h:    virtual OFCondition getUint16(Uint16 &val, const unsigned long pos = 0);
dcmdata/include/dcmtk/dcmdata/dcelem.h:    virtual OFCondition getSint32(Sint32 &val, const unsigned long pos = 0);
dcmdata/include/dcmtk/dcmdata/dcelem.h:    virtual OFCondition getUint32(Uint32 &val, const unsigned long pos = 0);
dcmdata/include/dcmtk/dcmdata/dcelem.h:    virtual OFCondition getFloat32(Float32 &val, const unsigned long pos = 0);
dcmdata/include/dcmtk/dcmdata/dcelem.h:    virtual OFCondition getSint64(Sint64 &val, const unsigned long pos = 0);
dcmdata/include/dcmtk/dcmdata/dcelem.h:    virtual OFCondition getUint64(Uint64 &val, const unsigned long pos = 0);
dcmdata/include/dcmtk/dcmdata/dcelem.h:    virtual OFCondition getFloat64(Float64 &val, const unsigned long pos = 0);
dcmdata/include/dcmtk/dcmdata/dcelem.h:    virtual OFCondition getTagVal(DcmTagKey &val, const unsigned long pos = 0);

[jriesmeier]

I guess this is for historical reasons. In the beginning (~1993), there was no support for OFString (nowadays, std::string), so you always got the complete element value when calling DcmElement::get(char * & val) ...

In any case, we would need to check what the implications of having a default value for the pos parameter of the DcmElement::getOFString() method.