/usr/include/sp/ISet.h is in libsp1-dev 1.3.4-1.2.1-47.3ubuntu1.
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 58  | // Copyright (c) 1994 James Clark
// See the file COPYING for copying permission.
#ifndef ISet_INCLUDED
#define ISet_INCLUDED
#include <stddef.h>
#include "Vector.h"
#include "Boolean.h"
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
template<class T> class ISetIter;
template<class T>
struct ISetRange {
  T min;
  T max;
};
  
template<class T>
class ISet {
public:
  ISet();
  ISet(const T *, size_t);
  ~ISet();
  Boolean contains(T) const;
  void remove(T);
  void add(T x) { addRange(x, x); }
  void addRange(T, T);
#if 0
  void add(const ISet<T> &);
#endif
  void check();
  void operator+=(T x) { addRange(x, x); }
  void clear();
  Boolean isSingleton() const {
    return r_.size() == 1 && r_[0].min == r_[0].max;
  }
  Boolean isEmpty() const { return r_.size() == 0; }
  void swap(ISet<T> &x) { r_.swap(x.r_); }
friend class ISetIter<T>;
private:
  Vector<ISetRange<T> > r_;
};
#ifdef SP_NAMESPACE
}
#endif
#endif /* not ISet_INCLUDED */
#ifdef SP_DEFINE_TEMPLATES
#include "ISet.cxx"
#endif
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