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diff --git a/vendor/gmp-6.3.0/cxx/ismpq.cc b/vendor/gmp-6.3.0/cxx/ismpq.cc
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+/* operator>> -- C++-style input of mpq_t.
+
+Copyright 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 either:
+
+ * 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.
+
+or
+
+ * 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.
+
+or both in parallel, as here.
+
+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 General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library. If not,
+see https://www.gnu.org/licenses/. */
+
+#include <cctype>
+#include <iostream>
+#include <string>
+#include "gmp-impl.h"
+
+using namespace std;
+
+
+istream &
+operator>> (istream &i, mpq_ptr q)
+{
+ if (! (i >> mpq_numref(q)))
+ return i;
+
+ char c = 0;
+ i.get(c); // start reading
+
+ if (c == '/')
+ {
+ // skip slash, read denominator
+ i.get(c);
+ return __gmpz_operator_in_nowhite (i, mpq_denref(q), c);
+ }
+ else
+ {
+ // no denominator, set 1
+ q->_mp_den._mp_size = 1;
+ q->_mp_den._mp_d[0] = 1;
+ if (i.good())
+ i.putback(c);
+ else if (i.eof())
+ i.clear(ios::eofbit);
+ }
+
+ return i;
+}