Changes from Version 1 of StaticVsDynamicArraysExample

Author:

jcc7 (IP: 68.97.93.38)

Timestamp:

11/12/05 04:26:00 (18 years ago)

Comment:

--

StaticVsDynamicArraysExample

@@ +1 @@
+= Static vs dynamic arrays =
+
+''Part of'' ArraysCategory
+
+== Description ==
+
+Shows the use of static and dynamic arrays, when references are copied and duplication is needed.
+
+== Example ==
+
+{{{
+#!d
+import std.c.stdio;
+import std.string;
+
+int main(char[][] args)
+{
+    int[] a = new int[4];
+    static int[4] a1 = [10, 20, 30, 40];
+    int[4] b, c;
+    int[] d, e;
+
+    // initialize the vector a with the values from a1 (i = 0..2, j = a1[0] .. a1[2])
+    foreach (int i, int j; a1)
+        a[i] = j / 10;
+    printf("a1[2] = %d\n", a1[2]);
+    // copy the vector a1 in the vector b
+    b[] = a1;
+    printf("\tb[2] = %d\n", b[2]);
+    // duplicate the vector a1 in the vector b (not needed for static arrays)
+    c[] = a1.dup;
+    printf("\tc[2] = %d\n", c[2]);
+    printf("a[2] = %d\n", a[2]);
+    // copy the vector a in the vector c (d is dynamic, so only the reference is copied)
+    d = a[];
+    printf("\td[2] = %d\n", d[2]);
+    // duplicate the vector a in the vector c (in this case it makes difference)
+    e = a[].dup;
+    printf("\te[2] = %d\n", e[2]);
+    // now a1[2] is modified
+    a1[2] = 0;
+
+    printf("a1[2] = %d\n", a1[2]);
+    // b is not modified
+    printf("\tb[2] = %d\n", b[2]);
+    // neither is c
+    printf("\tc[2] = %d\n", c[2]);
+    // now a[2] is modified
+    a[2] = 0;
+
+    printf("a[2] = %d\n", a[2]);
+    // d IS modified, because it is just a reference
+    printf("\td[2] = %d\n", d[2]);
+    // e IS NOT modified, because it is a copy
+    printf("\te[2] = %d\n", e[2]);
+    return 0;
+}
+}}}
+
+== Source ==
+
+|| Link || http://www.dsource.org/tutorials/index.php?show_example=149 ||
+|| Posted by || Anonymous ||