/usr/include/apt-pkg/metaindex.h is in libapt-pkg-dev 0.8.16~exp12ubuntu10.21.
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 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57  | #ifndef PKGLIB_METAINDEX_H
#define PKGLIB_METAINDEX_H
#include <string>
#include <apt-pkg/pkgcache.h>
#include <apt-pkg/indexfile.h>
#ifndef APT_8_CLEANER_HEADERS
#include <apt-pkg/srcrecords.h>
#include <apt-pkg/pkgrecords.h>
#include <apt-pkg/vendor.h>
using std::string;
#endif
class pkgAcquire;
class pkgCacheGenerator;
class OpProgress;
class metaIndex
{
   protected:
   std::vector <pkgIndexFile *> *Indexes;
   const char *Type;
   std::string URI;
   std::string Dist;
   bool Trusted;
   public:
   
   // Various accessors
   virtual std::string GetURI() const {return URI;}
   virtual std::string GetDist() const {return Dist;}
   virtual const char* GetType() const {return Type;}
   // Interface for acquire
   virtual std::string ArchiveURI(std::string const& /*File*/) const = 0;
   virtual bool GetIndexes(pkgAcquire *Owner, bool const &GetAll=false) const = 0;
   
   virtual std::vector<pkgIndexFile *> *GetIndexFiles() = 0; 
   virtual bool IsTrusted() const = 0;
   metaIndex(std::string const &URI, std::string const &Dist, char const * const Type) :
		Indexes(NULL), Type(Type), URI(URI), Dist(Dist) {
   }
   virtual ~metaIndex() {
      if (Indexes == 0)
	 return;
      for (std::vector<pkgIndexFile *>::iterator I = (*Indexes).begin(); I != (*Indexes).end(); ++I)
	 delete *I;
      delete Indexes;
   }
};
#endif
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