/usr/include/kml/base/referent.h is in libkml-dev 1.3.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#ifndef KML_BASE_REFERENT_H__
#define KML_BASE_REFERENT_H__
// This file contains the implementation of the Referent class which holds
// the reference counter used by boost::intrusive_ptr. The Referent class
// is a base class of all KML DOM Elements and also the base TempFile
// class. Neither the Referent class nor the methods here are part of the
// libkml public API.
namespace kmlbase {
// This class implements the reference count used by boost::intrusive_ptr.
class Referent {
public:
// The constructor only constructs the Referent object. The reference
// count is incremented if and when the Referent-derived object is assigned
// to a boost::intrusive_ptr.
Referent() : ref_count_(0) {}
virtual ~Referent() {}
// This method is used by intrusive_ptr_add_ref() to increment the reference
// count of a given Referent-derived object.
void add_ref() {
++ref_count_;
}
// This method is used by intrusive_ptr_release() to decrement the reference
// count of a given Referent-derived object.
int release() {
return --ref_count_;
}
// This is for debugging purposes only.
int get_ref_count() const {
return ref_count_;
}
private:
int ref_count_;
};
// These declarations are for the implementation of the functions used within
// boost::intrusive_ptr to manage Referent-derived objects.. See referent.cc
// and boost/intrusive_ptr.hpp.
void intrusive_ptr_add_ref(kmlbase::Referent* r);
void intrusive_ptr_release(kmlbase::Referent* r);
} // end namespace kmlbase
#endif // KML_BASE_REFERENT_H__
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