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     ! 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: }