/usr/include/apt-pkg/vendor.h is in libapt-pkg-dev 1.0.1ubuntu2.19.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | #ifndef PKGLIB_VENDOR_H
#define PKGLIB_VENDOR_H
#include <string>
#include <vector>
#include <map>
#include <apt-pkg/macros.h>
#ifndef APT_8_CLEANER_HEADERS
using std::string;
#endif
// A class representing a particular software provider.
class APT_DEPRECATED Vendor
{
   public:
   struct Fingerprint
   {
      std::string Print;
      std::string Description;
   };
   protected:
   std::string VendorID;
   std::string Origin;
   std::map<std::string, std::string> Fingerprints;
   public:
   Vendor(std::string VendorID, std::string Origin,
          std::vector<struct Fingerprint *> *FingerprintList);
   virtual const std::string& GetVendorID() const { return VendorID; };
   virtual const std::string LookupFingerprint(std::string Print) const;
   virtual bool CheckDist(std::string Dist);
   virtual ~Vendor(){};
};
#endif
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