golgotha/i4/inc/table.hh

/********************************************************************** <BR>
  This file is part of Crack dot Com's free source code release of
  Golgotha. <a href="http://www.crack.com/golgotha_release"> <BR> for
  information about compiling & licensing issues visit this URL</a> 
  <PRE> If that doesn't help, contact Jonathan Clark at 
  golgotha_source@usa.net (Subject should have "GOLG" in it) 
***********************************************************************/

//{{{ Table Template
//
//  Expanding Array Class
//
//$Id: table.hh,v 1.3 1997/09/29 04:29:52 oliy Exp $
//}}}

#ifndef I4_TABLE_HH
#define I4_TABLE_HH

#include "arch.hh"
#include "error/error.hh"
#include "memory/malloc.hh"

//#define I4_TABLE_NO_GROWTH

template <class T>
class i4_table
{
protected:
  T *entry;
  w16 used,entries;
#ifndef I4_TABLE_NO_GROWTH
  w16 grow;
#endif
public:

  int size() const { return used; }
  T& operator[](int i) const 
  //{{{
  {
    I4_ASSERT(i>=0 && i<used, "table::bad array reference");
    return entry[i]; 
  }
  //}}}

  i4_table(int entries, int grow = 0) : entries(entries), entry(0), used(0)
#ifndef I4_TABLE_NO_GROWTH
                                        ,grow(grow)
#endif
  //{{{
  {
    if (entries>0)
      entry = (T*)i4_malloc(sizeof(T)*entries,"table");

    I4_ASSERT(entry, "table::can't allocate entries");
  }
  //}}}

  ~i4_table() 
  //{{{
  {
    clear(); 
    i4_free(entry);
    entries = 0;
  }
  //}}}

  int add(T item,int ref = -1)
  //{{{
  {
    I4_ASSERT(item, "table::bad item add");

    if (ref<0)
      ref += used+1;

    I4_ASSERT(ref>=0 && ref<=used,"table::bad item referenced");

    if (used>=entries)
    {
#ifndef I4_TABLE_NO_GROWTH
      if (grow)
      {
        entries += grow;

        T* new_entry = (T*)i4_realloc(entry, sizeof(T *)*entries, "table");
        
        I4_ASSERT(new_entry, "table::out of memory");

        entry = new_entry;
      }
      else
#endif
        I4_ASSERT(0, "table::out of entries");
    }

    for (int i=used; i>ref; i--)
      entry[i] = entry[i-1];
    entry[ref] = item;
    used++;

    return ref;
  }
  //}}}

  int add_table(const i4_table& tab,int ref = -1)
  //{{{
  {
    if (ref<0)
      ref += used+1;

    I4_ASSERT(ref>=0 && ref<=used,"table::bad item referenced");

    if (used+tab.size() >= entries)
    {
#ifndef I4_TABLE_NO_GROWTH
      if (grow)
      {
        if (used+tab.size() >= entries+grow)
          entries = used+tab.size();
        else
          entries += grow;

        T* new_entry = (T*)i4_realloc(entry, sizeof(T *)*entries, "table");
        
        I4_ASSERT(new_entry, "table::out of memory");

        entry = new_entry;
      }
      else
#endif
        I4_ASSERT(0, "table::out of entries");
    }

    int i;

    for (i=used-1; i>ref; i--)
      entry[i+tab.size()] = entry[i];
    for (i=0; i<tab.size(); i++)
      entry[ref+i] = tab.entry[i];

    used+=tab.size();

    return ref;
  }
  //}}}

  void remove(int ref)
  //{{{
  {
    I4_ASSERT(ref>=0 && ref<used, "table::bad item deletion");

    used--;
    for (int i=ref; i<used; i++)
      entry[i] = entry[i+1];
  }
  //}}}

  void clear()
  //{{{
  {
    used = 0;
  }
  //}}}
};

#endif

//{{{ Emacs Locals
// Local Variables:
// folded-file: t
// End:
//}}}