/usr/include/qgis/qgsfeature_p.h is in libqgis-dev 2.18.17+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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                      qgsfeature_p.h
                     ---------------
Date                 : May-2015
Copyright            : (C) 2015 by Nyall Dawson
email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef QGSFEATURE_PRIVATE_H
#define QGSFEATURE_PRIVATE_H
/// @cond PRIVATE
//
//  W A R N I N G
//  -------------
//
// This file is not part of the QGIS API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
/***************************************************************************
 * This class is considered CRITICAL and any change MUST be accompanied with
 * full unit tests in testqgsfeature.cpp.
 * See details in QEP #17
 ****************************************************************************/
#include "qgsfield.h"
#include "qgsgeometry.h"
class QgsFeaturePrivate : public QSharedData
{
  public:
    explicit QgsFeaturePrivate( QgsFeatureId id )
        : fid( id )
        , geometry( nullptr )
        , ownsGeometry( false )
        , valid( false )
    {
    }
    QgsFeaturePrivate( const QgsFeaturePrivate& other )
        : QSharedData( other )
        , fid( other.fid )
        , attributes( other.attributes )
        , geometry( other.ownsGeometry && other.geometry ? new QgsGeometry( *other.geometry ) : other.geometry )
        , ownsGeometry( other.ownsGeometry )
        , valid( other.valid )
        , fields( other.fields )
    {
    }
    ~QgsFeaturePrivate()
    {
      if ( ownsGeometry )
        delete geometry;
    }
    //! feature id
    QgsFeatureId fid;
    /** Attributes accessed by field index */
    QgsAttributes attributes;
    /** Pointer to geometry in binary WKB format
       This is usually set by a call to OGRGeometry::exportToWkb()
     */
    QgsGeometry *geometry;
    /** Indicator if the mGeometry is owned by this QgsFeature.
        If so, this QgsFeature takes responsibility for the mGeometry's destruction.
     */
    bool ownsGeometry;
    //! Flag to indicate if this feature is valid
    bool valid;
    //! Optional field map for name-based attribute lookups
    QgsFields fields;
};
/// @endcond
#endif //QGSFEATURE_PRIVATE_H
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