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/*
* CENA C++ Utilities
*
* by Stephane Chatty
*
* Copyright 1990, 1991, 1992
* Laboratoire de Recherche en Informatique (LRI)
* Centre d'Etudes de la Navigation Aerienne (CENA)
*
* plain and generic arrays (orginal C version by Michel Beaudouin-Lafon)
*
* $Id$
* $CurLog$
*/
#include "Array.h"
#include <memory.h>
#include <stdio.h>
/*?class CcuArray
\typ{CcuArray}s are dynamic arrays whose lower bound is 0. For a
\typ{CcuArray} with size \var{size}, the valid indices are \var{0, \ldots, size -- 1.}
Their elements are of type \typ{CcuArrayItem*}. Methods are provided for
initialization, data storage and retrieval, and a few other utilities.
?*/
CcuArrayItem* CcuArray::InvalidCell = 0;
/*?
Initialize a \typ{CcuArray} with size \var{size}.
Entries are initialized to \var{value}.
?*/
CcuArray :: CcuArray (int size, CcuArrayItem* value)
{
if (size > 0) {
Data = new CcuArrayItem* [size];
register CcuArrayItem** p = Data;
for (register int i = 0; i < size; ++i, ++p)
*p = value;
} else {
Data = 0;
size = 0;
}
Length = size;
}
/*?nodoc?*/
CcuArray :: CcuArray (const CcuArray& a)
: Length (a.Length)
{
if (Length == 0) {
Data = 0;
} else {
Data = new CcuArrayItem* [Length];
register CcuArrayItem** p;
register CcuArrayItem** q;
register int i;
for (p = Data, q = a.Data, i = Length ; i--; ++p, ++q)
*p = *q;
}
}
/*?nodoc?*/
CcuArray :: ~CcuArray ()
{
/* Free the data */
Clean ();
}
/*
* Empty the array.
*/
/*?hidden?*/
void
CcuArray :: Clean ()
{
if (Data)
#ifndef CPLUS_BUG4
delete [] Data;
#else
delete [Length] Data;
#endif
Data = 0;
Length = 0;
}
/*?
Set all entries to \var{value}.
?*/
void
CcuArray :: Reset (CcuArrayItem* value)
{
register CcuArrayItem** p;
register int i;
for (p = Data, i = Length ; i--; ++p)
*p = value;
}
/*?
Copy the contents of the array \var{from} into this array.
The old contents, if any, are freed, and new memory is allocated for the copy.
?*/
CcuArray&
CcuArray :: operator = (const CcuArray& from)
{
if (this != &from) {
Clean ();
Length = from.Length;
if (Length > 0 && from.Data) {
Data = new CcuArrayItem* [Length];
memcpy (Data, from.Data, Length * sizeof (CcuArrayItem*));
} else
Data = 0;
}
return *this;
}
/*?
Change the size of the array to \var{size}. The new entries, if any,
are set to \var{value}.
This function reallocates the contents of the array.
?*/
void
CcuArray :: Resize (int size, CcuArrayItem* value)
{
if (size <= 0) {
Clean ();
return;
}
CcuArrayItem** NewData = new CcuArrayItem* [size];
/* if the new sequence is longer, copy and fill end, else just copy */
if (size > Length) {
if (Length)
memcpy (NewData, Data, Length * sizeof (CcuArrayItem*));
register CcuArrayItem** pfil = NewData + Length;
for (register int i = size - Length; i--; *pfil++ = value)
;
} else
memcpy (NewData, Data, size * sizeof (CcuArrayItem*));
/* free old data and set new array */
Clean ();
Data = NewData;
Length = size;
}
/*?
Return the address of the \var{i}th element.
?*/
CcuArrayItem**
CcuArray :: operator + (register int i) const
{
if (Check (i))
return Data+i;
else {
fprintf (stderr, "Index %d out of array bounds: size was %d\n", i, Length);
return &InvalidCell;
}
}
/*?
Get a reference to the \var{i}-th entry, so that this entry can be read or written.
If \var{i} is outside the bounds,
the operator returns a reference to a static variable which initially contains 0.
?*/
CcuArrayItem*&
CcuArray :: operator [] (register int i) const
{
if (Check (i))
return Data [i];
else {
fprintf (stderr, "Index %d out of array bounds: size was %d\n", i, Length);
return InvalidCell;
}
}
#ifdef DOC
/*?class CcuArrayOf
The generic class \typ{CcuArrayOf} is a derived class of \typ{CcuArray} that provides
arrays of pointers to class objects. When parameterized by the class \typ{ITEM},
the following functions are redefined:
?*/
/*?nextdoc?*/
CcuArrayOf :: CcuArrayOf (int size, ITEM* value = 0)
{
}
/*?nextdoc?*/
void
CcuArrayOf :: Reset (ITEM* value = 0)
{
}
/*?nextdoc?*/
void
CcuArrayOf :: Resize (int size, ITEM* value = 0)
{
}
/*?nextdoc?*/
ITEM*&
CcuArrayOf :: operator [] (int i) const
{
}
/*?
These functions are equivalent to their homonyms in the class \typ{CcuArray},
except that they are customized in order to manipulate pointers to \typ{ITEM}
instead of \typ{void*}.
?*/
ITEM**
CcuArrayOf :: operator + (int i) const
{
}
#endif /* DOC */
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