--- /dev/null
+/* operator>> -- C++-style input of mpz_t.
+
+Copyright 2001, 2003 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; 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.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
+
+#include <cctype>
+#include <iostream>
+#include <string>
+#include "gmp.h"
+#include "gmp-impl.h"
+
+using namespace std;
+
+
+// For g++ libstdc++ parsing see num_get<chartype,initer>::_M_extract_int in
+// include/bits/locale_facets.tcc.
+
+istream &
+operator>> (istream &i, mpz_ptr z)
+{
+ char c = 0;
+ i.get(c); // start reading
+
+ if (i.flags() & ios::skipws) // skip initial whitespace
+ {
+#if HAVE_STD__LOCALE
+ const ctype<char>& ct = use_facet< ctype<char> >(i.getloc());
+#define cxx_isspace(c) (ct.is(ctype_base::space,(c)))
+#else
+#define cxx_isspace(c) isspace(c)
+#endif
+
+ while (cxx_isspace(c) && i.get(c))
+ ;
+ }
+
+ return __gmpz_operator_in_nowhite (i, z, c);
+}