/usr/include/wx-3.0/wx/windowptr.h is in wx3.0-headers 3.0.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Name:        wx/windowptr.h
// Purpose:     smart pointer for holding wxWindow instances
// Author:      Vaclav Slavik
// Created:     2013-09-01
// Copyright:   (c) 2013 Vaclav Slavik
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_WINDOWPTR_H_
#define _WX_WINDOWPTR_H_
#include "wx/sharedptr.h"
// ----------------------------------------------------------------------------
// wxWindowPtr: A smart pointer with correct wxWindow destruction.
// ----------------------------------------------------------------------------
namespace wxPrivate
{
struct wxWindowDeleter
{
    void operator()(wxWindow *win)
    {
        win->Destroy();
    }
};
} // namespace wxPrivate
template<typename T>
class wxWindowPtr : public wxSharedPtr<T>
{
public:
    typedef T element_type;
    wxEXPLICIT wxWindowPtr(element_type* win)
        : wxSharedPtr<T>(win, wxPrivate::wxWindowDeleter())
    {
    }
    wxWindowPtr() {}
    wxWindowPtr(const wxWindowPtr& tocopy) : wxSharedPtr<T>(tocopy) {}
    wxWindowPtr& operator=(const wxWindowPtr& tocopy)
    {
        wxSharedPtr<T>::operator=(tocopy);
        return *this;
    }
    wxWindowPtr& operator=(element_type* win)
    {
        return operator=(wxWindowPtr(win));
    }
    void reset(T* ptr = NULL)
    {
        wxSharedPtr<T>::reset(ptr, wxPrivate::wxWindowDeleter());
    }
};
#endif // _WX_WINDOWPTR_H_
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