/usr/include/CGAL/gmpxx.h is in libcgal-dev 4.2-5ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 3 of the License,
// or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
//
//
// Author(s) : Sylvain Pion
// This file gathers the necessary adaptors so that the following
// C++ number types that come with GMP can be used by CGAL :
// - mpz_class (see #include <CGAL/mpz_class.h>)
// - mpq_class (see #include <CGAL/mpq_class.h>)
// - mpf_class support is commented out until to_interval() is implemented.
// It is probably not very useful with CGAL anyway.
// Note that GMP++ use the expression template mechanism, which makes things
// a little bit complicated in order to make square(x+y) work for example.
// Reading gmpxx.h shows that ::__gmp_expr<T, T> is the mp[zqf]_class proper,
// while ::__gmp_expr<T, U> is the others "expressions".
#ifndef CGAL_GMPXX_H
#define CGAL_GMPXX_H
#include <CGAL/number_type_basic.h>
#include <cstring> // needed by GMP 4.1.4 since <gmpxx.h> misses it.
#include <gmpxx.h>
#include <utility>
#include <CGAL/mpz_class.h>
#include <CGAL/mpq_class.h>
#include <CGAL/gmpxx_coercion_traits.h>
namespace CGAL {
template < typename T, typename U >
class Algebraic_structure_traits< ::__gmp_expr<T,U> >
: public Algebraic_structure_traits< ::__gmp_expr<T,T> >{};
template < typename T, typename U >
class Real_embeddable_traits< ::__gmp_expr<T,U> >
: public Real_embeddable_traits< ::__gmp_expr<T,T> >{};
} //namespace CGAL
#endif // CGAL_GMPXX_H
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