pq.ccp

早期freebsd实现

// This may look like C code, but it is really -*- C++ -*-
/* 
Copyright (C) 1988 Free Software Foundation
    written by Doug Lea ([e-mail])

This file is part of the GNU C++ Library.  This library is free
software; you can redistribute it and/or modify it under the terms of
the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.  This 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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifdef __GNUG__
#pragma implementation
#endif
#include <builtin.h>
#include "<T>.PQ.h"



<T> <T>PQ::deq()
{
  <T> x = front();
  del_front();
  return x;
}

Pix <T>PQ::seek(<T&> item)
{
  for (Pix i = first(); i != 0 && !(<T>EQ((*this)(i), item)); next(i));
  return i;
}

int <T>PQ::owns(Pix idx)
{
  if (idx == 0) return 0;
  for (Pix i = first(); i; next(i)) if (i == idx) return 1;
  return 0;
}

void <T>PQ::clear()
{
  while (count != 0) del_front();
}

int <T>PQ::contains (<T&> item)
{
  return seek(item) != 0;
}


void <T>PQ::error(const char* msg)
{
  (*lib_error_handler)("PQ", msg);
}