array.c

四皇后问题

/*
	Little Smalltalk
		Array creation

		timothy a. budd 10/84

	builds a new instance of class array.
	called mostly by the driver to construct array constants.
*/
/*
	The source code for the Little Smalltalk System may be freely
	copied provided that the source of all files is acknowledged
	and that this condition is copied with each file.

	The Little Smalltalk System is distributed without responsibility
	for the performance of the program and without any guarantee of
	maintenance.

	All questions concerning Little Smalltalk should be addressed to:

		Professor Tim Budd
		Department of Computer Science
		Oregon State University
		Corvallis, Oregon
		97331
		USA
*/
# include <stdio.h>
# include "object.h"

class *Array = (class *) 0;
class *ArrayedCollection = (class *) 0;

extern object *o_nil, *o_empty, *o_acollection;
extern int started;		/* gets set after reading std prelude */

/* new_iarray - internal form of new array */
object *new_iarray(size)
int size;
{	object *new;

	if (size < 0) cant_happen(2);
	new = new_obj(Array, size, 0);
	if (! started) {
		sassign(new->super_obj, o_acollection);
		}
	else if (ArrayedCollection)
		sassign(new->super_obj, new_inst(ArrayedCollection));
	return(new);
}

/* new_array - create a new array */
object *new_array(size, initial)
int size, initial;
{	int i;
	object *new;

	if (size == 0) return(o_empty);
	new = new_iarray(size);
	if (initial) {
		for (i = 0; i < size; i++)
			sassign(new->inst_var[ i ], o_nil);
		}
	return(new);
}