Danny Robson
67d567b5c3
Allows one to print a given number of bits from an integral value easily using streams.
76 lines
2.0 KiB
C++
76 lines
2.0 KiB
C++
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2010 Danny Robson <danny@nerdcruft.net>
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*/
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#include "stream.hpp"
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#include "debug.hpp"
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using util::stream::null;
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using util::stream::bits;
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//-----------------------------------------------------------------------------
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std::ostream&
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null::put (char)
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{ return *this; }
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//-----------------------------------------------------------------------------
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bool
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null::good (void) const
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{ return !bad () && !eof () && !fail (); }
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//-----------------------------------------------------------------------------
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bool null::bad (void) const { return false; }
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bool null::eof (void) const { return false; }
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bool null::fail (void) const { return false; }
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//-----------------------------------------------------------------------------
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bits::bits (uintmax_t _value, unsigned _count):
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value (_value),
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count (_count)
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{
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CHECK_LE (count, sizeof(value) * 8);
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}
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//-----------------------------------------------------------------------------
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std::ostream&
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operator<< (std::ostream &os, util::stream::bits b) {
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char digits[sizeof (b.value) * 8 + 1] = { 0 };
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char *cursor = std::end (digits) - 1;
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uintmax_t bits = b.value;
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unsigned count = b.count;
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while (count) {
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CHECK_GE (cursor, digits);
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--cursor;
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*cursor = (bits & 0x01) ? '1' : '0';
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bits >>= 1;
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count -= 1;
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}
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os << cursor << "/" << b.count;
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return os;
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}
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