ismpznw.cc
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上传日期:2022-08-06
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- /* __gmpz_operator_in_nowhite -- C++-style input of mpz_t, no whitespace skip.
- 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 &
- __gmpz_operator_in_nowhite (istream &i, mpz_ptr z, char c)
- {
- int base;
- string s;
- bool ok = false, zero, showbase;
- if (c == '-' || c == '+') // sign
- {
- if (c == '-') // mpz_set_str doesn't accept '+'
- s = "-";
- i.get(c);
- }
- base = __gmp_istream_set_base(i, c, zero, showbase); // select the base
- __gmp_istream_set_digits(s, i, c, ok, base); // read the number
- if (i.good()) // last character read was non-numeric
- i.putback(c);
- else if (i.eof() && (ok || zero)) // stopped just before eof
- i.clear();
- if (ok)
- ASSERT_NOCARRY (mpz_set_str (z, s.c_str(), base)); // extract the number
- else if (zero)
- mpz_set_ui(z, 0);
- else
- i.setstate(ios::failbit); // read failed
- return i;
- }