114 lines
2.7 KiB
C++
114 lines
2.7 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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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/assert.hpp"
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#include <ostream>
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using cruft::stream::null_ostream;
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using cruft::stream::bits;
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///////////////////////////////////////////////////////////////////////////////
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cruft::stream::scoped::flags::flags (std::ios_base &_ios):
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m_ios (_ios),
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m_state (_ios.flags ())
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{ ; }
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//-----------------------------------------------------------------------------
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cruft::stream::scoped::flags::~flags ()
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{
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m_ios.flags (m_state);
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}
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///////////////////////////////////////////////////////////////////////////////
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cruft::stream::scoped::precision::precision (std::ios_base &_ios):
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m_ios (_ios),
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m_state (_ios.precision ())
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{ ; }
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//-----------------------------------------------------------------------------
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cruft::stream::scoped::precision::~precision ()
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{
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m_ios.precision (m_state);
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}
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///////////////////////////////////////////////////////////////////////////////
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cruft::stream::scoped::width::width (std::ios_base &_ios):
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m_ios (_ios),
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m_state (_ios.width ())
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{ ; }
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//-----------------------------------------------------------------------------
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cruft::stream::scoped::width::~width ()
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{
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m_ios.width (m_state);
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}
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///////////////////////////////////////////////////////////////////////////////
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std::ostream&
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null_ostream::put (char)
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{
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return *this;
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}
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//-----------------------------------------------------------------------------
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bool
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null_ostream::good (void) const
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{
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return !bad () && !eof () && !fail ();
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}
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//-----------------------------------------------------------------------------
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bool null_ostream::bad (void) const { return false; }
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bool null_ostream::eof (void) const { return false; }
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bool null_ostream::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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cruft::stream::operator<< (std::ostream &os, cruft::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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