Return to ismpz.cc CVS log

Up to [local] / OpenXM_contrib / gmp / cxx

Annotation of OpenXM_contrib/gmp/cxx/ismpz.cc, Revision 1.1.1.1

1.1       ohara       1: /* operator>> -- C++-style input of mpz_t.
                      2:
                      3: Copyright 2001, 2002 Free Software Foundation, Inc.
                      4:
                      5: This file is part of the GNU MP Library.
                      6:
                      7: The GNU MP Library is free software; you can redistribute it and/or modify
                      8: it under the terms of the GNU Lesser General Public License as published by
                      9: the Free Software Foundation; either version 2.1 of the License, or (at your
                     10: option) any later version.
                     11:
                     12: The GNU MP Library is distributed in the hope that it will be useful, but
                     13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     15: License for more details.
                     16:
                     17: You should have received a copy of the GNU Lesser General Public License
                     18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: MA 02111-1307, USA. */
                     21:
                     22: #include <cctype>
                     23: #include <iostream>
                     24: #include <string>
                     25: #include "gmp.h"
                     26: #include "gmp-impl.h"
                     27:
                     28: using namespace std;
                     29:
                     30:
                     31: istream &
                     32: operator>> (istream &i, mpz_ptr z)
                     33: {
                     34:   int base;
                     35:   char c = 0;
                     36:   string s;
                     37:   bool ok = false, zero, showbase;
                     38:
                     39:   i.get(c); // start reading
                     40:
                     41:   if (i.flags() & ios::skipws) // skip initial whitespace
                     42:     while (isspace(c) && i.get(c))
                     43:       ;
                     44:
                     45:   if (c == '-' || c == '+') // sign
                     46:     {
                     47:       if (c == '-') // mpz_set_str doesn't accept '+'
                     48:        s = "-";
                     49:       i.get(c);
                     50:
                     51:       while (isspace(c) && i.get(c)) // skip whitespace
                     52:        ;
                     53:     }
                     54:
                     55:   base = __gmp_istream_set_base(i, c, zero, showbase); // select the base
                     56:   __gmp_istream_set_digits(s, i, c, ok, base);         // read the number
                     57:
                     58:   if (i.good()) // last character read was non-numeric
                     59:     i.putback(c);
                     60:   else if (i.eof() && (ok || zero)) // stopped just before eof
                     61:     i.clear();
                     62:
                     63:   if (ok)
                     64:     mpz_set_str(z, s.c_str(), base); // extract the number
                     65:   else if (zero)
                     66:     mpz_set_ui(z, 0);
                     67:   else
                     68:     i.setstate(ios::failbit); // read failed
                     69:
                     70:   return i;
                     71: }