March 17, 2005
# import std.stdio;
#
# void main()
# {
#     byte[] ascii = cast(byte[])"0000";
#     bit[] sms;
#     bit[] tmp;
#
#     writef("ASC:");
#     foreach(int i, bit bb; (cast(bit*)ascii.ptr)[0..32]) {
#         if (i && i%8 == 0) writef(" ");
#         writef("%d",bb);
#     }
#     writefln("");
#
#     foreach(int j, byte b; ascii) {
#         tmp = (cast(bit*)&b)[0..7];
#
#         writef("TMP:");
#         for(int k = 0; k < j; k++) writef("         ");
#         foreach(int i, bit b; tmp) writef("%d",b);
#         writefln("");
#
#         sms ~= tmp;
#
#         writef("SMS:");
#         foreach(int i, bit b; sms) {
#             if (i && i%7 == 0) writef("  ");
#             writef("%d",b);
#         }
#         writefln("");
#     }
#     writefln("");
# }

output:

ASC:00001100 00001100 00001100 00001100
TMP:0000110
SMS:0000110
TMP:         0000110
SMS:0000110  0010111
TMP:                  0000110
SMS:0000110  0010111  0010000
TMP:                           0000110
SMS:0000110  0010111  0010000  0100000

'tmp' is appended to 'sms' each time round the loop, but something is going very wrong.

Anyone got any ideas?

Regan
March 17, 2005
On Thu, 17 Mar 2005 13:48:23 +1300, Regan Heath wrote:

> # import std.stdio;
> #
> # void main()
> # {
> #     byte[] ascii = cast(byte[])"0000";
> #     bit[] sms;
> #     bit[] tmp;
> #
> #     writef("ASC:");
> #     foreach(int i, bit bb; (cast(bit*)ascii.ptr)[0..32]) {
> #         if (i && i%8 == 0) writef(" ");
> #         writef("%d",bb);
> #     }
> #     writefln("");
> #
> #     foreach(int j, byte b; ascii) {
> #         tmp = (cast(bit*)&b)[0..7];
> #
> #         writef("TMP:");
> #         for(int k = 0; k < j; k++) writef("         ");
> #         foreach(int i, bit b; tmp) writef("%d",b);
> #         writefln("");
> #
> #         sms ~= tmp;
> #
> #         writef("SMS:");
> #         foreach(int i, bit b; sms) {
> #             if (i && i%7 == 0) writef("  ");
> #             writef("%d",b);
> #         }
> #         writefln("");
> #     }
> #     writefln("");
> # }
> 
> output:
> 
> ASC:00001100 00001100 00001100 00001100
> TMP:0000110
> SMS:0000110
> TMP:         0000110
> SMS:0000110  0010111
> TMP:                  0000110
> SMS:0000110  0010111  0010000
> TMP:                           0000110
> SMS:0000110  0010111  0010000  0100000
> 
> 'tmp' is appended to 'sms' each time round the loop, but something is going very wrong.
> 
> Anyone got any ideas?
> 
> Regan

I think you found a bug. Here another way to show the same bug...
<code>
import std.stdio;
void displayb(char[] name, bit[] x)
{
    writef("%-5s: ", name);
    foreach(bit b; x)
        writef("%d",b);
    writefln("");
}

void main()
{
    bit[] a;
    bit[] b;

    a.length = 7;
    a[0] = 0;
    a[1] = 1;
    a[2] = 1;
    a[3] = 0;
    a[4] = 0;
    a[5] = 1;
    a[6] = 0;

    displayb("a", a);

    b ~= a;
    displayb("b1", b);

    b ~= a;
    displayb("b2", b);

    b.length = 0;
    b ~= a;
    displayb("b3", b);

    b.length = b.length + 7;
    for(int i = 0; i < a.length; i++)
        b[i+7] = a[i];
    displayb("b4", b);

}
<code>

-- 
Derek
Melbourne, Australia
17/03/2005 12:12:15 PM
March 25, 2005
Regan Heath wrote:

| # import std.stdio;
| #
| # void main()
| # {
| #     byte[] ascii = cast(byte[])"0000";
| #     bit[] sms;
| #     bit[] tmp;
| #
| #     writef("ASC:");
| #     foreach(int i, bit bb; (cast(bit*)ascii.ptr)[0..32]) {
| #         if (i && i%8 == 0) writef(" ");
| #         writef("%d",bb);
| #     }
| #     writefln("");
| #
| #     foreach(int j, byte b; ascii) {
| #         tmp = (cast(bit*)&b)[0..7];
| #
| #         writef("TMP:");
| #         for(int k = 0; k < j; k++) writef("         ");
| #         foreach(int i, bit b; tmp) writef("%d",b);
| #         writefln("");
| #
| #         sms ~= tmp;
| #
| #         writef("SMS:");
| #         foreach(int i, bit b; sms) {
| #             if (i && i%7 == 0) writef("  ");
| #             writef("%d",b);
| #         }
| #         writefln("");
| #     }
| #     writefln("");
| # }
|
| output:
|
| ASC:00001100 00001100 00001100 00001100
| TMP:0000110
| SMS:0000110
| TMP:         0000110
| SMS:0000110  0010111
| TMP:                  0000110
| SMS:0000110  0010111  0010000
| TMP:                           0000110
| SMS:0000110  0010111  0010000  0100000
|
| 'tmp' is appended to 'sms' each time round the loop, but something is
| going very wrong.
|
| Anyone got any ideas?

Added to DStress as
http://dstress.kuehne.cn/run/opCatAssign_09.d
http://dstress.kuehne.cn/run/opCatAssign_10.d

Thomas

Top | Discussion index | About this forum | D home