Changes from Version 1 of CharArrayRefExample

Author:

jcc7 (IP: 192.149.244.9)

Timestamp:

04/26/06 16:02:24 (18 years ago)

Comment:

created example

CharArrayRefExample

@@ +1 @@
+= Character Array Reference =
+
+''Part of'' ArraysCategory
+
+== Description ==
+
+Shows how an array can reference another array.
+
+== Example ==
+
+{{{
+#!d
+import std.stdio;
+
+void main()
+{
+    char[] a = new char[20];
+    char[] b = a[0..10];
+    char[] c = a[10..20];
+
+
+    a[] = ' ';      /* Fill with spaces so that I can print the array elements. */
+
+    writefln("(before)   a[11]: %s   a[15]: %s   c[1]: %s   c[5]: %s", a[11], a[15], c[1], c[5]);
+
+    b.length = 15;      /* always resized in place because it is sliced
+                           from a[] which has enough memory for 15 chars */
+    b[11] = 'x';    /* a[11] and c[1] are also affected */
+
+    writefln("(after)    a[11]: %s   a[15]: %s   c[1]: %s   c[5]: %s", a[11], a[15], c[1], c[5]);
+
+    a.length = 1;
+    a.length = 20;      /* no net change to memory layout */
+
+    c.length = 12;      /* always does a copy because c[] is not at the
+                           start of a gc allocation block */
+    c[5] = 'y';    /* does not affect contents of a[] or b[] */
+
+    a.length = 25;      /* may or may not do a copy */
+    a[3] = 'z';    /* may or may not affect b[3] which still overlaps
+                          the old a[3] */
+}
+}}}
+
+
+
+== Output ==
+{{{
+(before)   a[11]:     a[15]:     c[1]:     c[5]:
+(after)    a[11]: x   a[15]:     c[1]: x   c[5]:
+}}}
+
+== Source ==
+Based on the example code from http://www.digitalmars.com/d/arrays.html, "Setting Dynamic Array Length" section.
+