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/usr/include/xbase64/xbmindex.h is in libxbase64-dev 3.1.2-0ubutu1.

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#ifndef xbMultiIndex_h
#define xbMultiIndex_h

#include <xbase64/xbase64.h>

class xbMultiIndex: public xbIndex
{
  public:
    xbMultiIndex(xbDbf* dbf): xbIndex(dbf) {}
    virtual ~xbMultiIndex() {}
    virtual xbShort CreateIndex(const char * filename, const char* tag, 
         const char* expr, xbShort unique, xbShort overwrite)=0;
};
#endif