Hello all,

I found source code for an old game written in D, I'm talking circa 2004 here. It seems like it was written against D v0.110 according to the documentation I found.

My project is to modernise it, maybe make it multiplatform, or even compile to wasm and browser based. But first, I'm trying to compile it as is and I found something odd.

>  private void calcIndex(in float z, out int idx, out float ofs) {
>    idx = slice.length + 99999;
>    for (int i = 1; i < slice.length; i++) {
>      if (z < slice[i].depth) {
>        idx = i - 1;
>        ofs = (z - slice[idx].depth) / (slice[idx + 1].depth - slice[idx].depth);
>        break;
>      }
>    }
>    if (idx < 0) {
>      idx = 0;
>      ofs = 0;
>    } else if (idx >= slice.length - 1) {
>      idx = slice.length - 2;
>      ofs = 0.99;
>    }
>    if (ofs !>= 0)
>      ofs = 0;
>    else if (ofs >= 1)
>      ofs = 0.99;
>  }

Trying to compile this, it complains about:

> Error: template argument expected following !

This is from the line with "if (ofs !>= 0)".

Would anyone know what this operator was for back in v0.110? I'm assuming it's been removed some time ago...

Thanks, Remi.

On Saturday, 11 July 2020 at 09:37:42 UTC, Remi wrote:
>
> This is from the line with "if (ofs !>= 0)".
>

Not greater than or equal to?

On Saturday, 11 July 2020 at 09:47:36 UTC, aberba wrote:
> On Saturday, 11 July 2020 at 09:37:42 UTC, Remi wrote:
>>
>> This is from the line with "if (ofs !>= 0)".
>>
>
> Not greater than or equal to?

Just a guess by the way

On Saturday, 11 July 2020 at 09:37:42 UTC, Remi wrote:
> Hello all,
>
> I found source code for an old game written in D, I'm talking circa 2004 here. It seems like it was written against D v0.110 according to the documentation I found.
>
> My project is to modernise it, maybe make it multiplatform, or even compile to wasm and browser based. But first, I'm trying to compile it as is and I found something odd.
>
>>  [...]
>
> Trying to compile this, it complains about:
>
>> [...]
>
> This is from the line with "if (ofs !>= 0)".
>
> Would anyone know what this operator was for back in v0.110? I'm assuming it's been removed some time ago...
>
> Thanks, Remi.

It's lesser, i.e "<". The code in itself looks like a wrap(0.0,0.99).
Maybe 0.99 and not 1 is because of FP comparison ?

On 11/07/2020 9:37 PM, Remi wrote:
> 
> This is from the line with "if (ofs !>= 0)".
> 
> Would anyone know what this operator was for back in v0.110? I'm assuming it's been removed some time ago...

https://digitalmars.com/d/1.0/operatoroverloading.html#Binary

After hunting for dmd 0.110, it looks like it just means a < b for integrals. For floats it checks for NaN instead.

http://ftp.digitalmars.com/dmd.110.zip

On 7/11/2020 2:37 AM, Remi wrote:
> This is from the line with "if (ofs !>= 0)".
> 
> Would anyone know what this operator was for back in v0.110? I'm assuming it's been removed some time ago...


Here's a truth table for it:

    https://www.digitalmars.com/ctg/ctgNumerics.html#comparisons

and !>= means "unordered or less than".

Unordered means if one of the operands is a NaN. So, you can rewrite it as:

    if (std.math.isNaN(ofs) || ofs < 0)

On Saturday, 11 July 2020 at 10:14:05 UTC, Walter Bright wrote:

> Here's a truth table for it:
>
>     https://www.digitalmars.com/ctg/ctgNumerics.html#comparisons
> [...]

I checked some of the articles there and it seems some were not ported to the new website.

This one especially on memory management is very well articulated.

https://digitalmars.com/d/2.0/memory.html#realtime

On Saturday, 11 July 2020 at 10:14:05 UTC, Walter Bright wrote:
> On 7/11/2020 2:37 AM, Remi wrote:
>> This is from the line with "if (ofs !>= 0)".
>> 
>> Would anyone know what this operator was for back in v0.110? I'm assuming it's been removed some time ago...
>
>
> Here's a truth table for it:
>
>     https://www.digitalmars.com/ctg/ctgNumerics.html#comparisons
>
> and !>= means "unordered or less than".
>
> Unordered means if one of the operands is a NaN. So, you can rewrite it as:
>
>     if (std.math.isNaN(ofs) || ofs < 0)

That's great thanks! I didn't think of checking in that original docs, duh! It now compiles the game code but not some dependencies, I'll need to resolve issues regarding the std it seems as I think that changed since then.

On Saturday, 11 July 2020 at 10:42:20 UTC, Remi wrote:
> That's great thanks! I didn't think of checking in that original docs, duh! It now compiles the game code but not some dependencies, I'll need to resolve issues regarding the std it seems as I think that changed since then.

Undead package contains code from old phobos for such cases.

On Saturday, 11 July 2020 at 14:58:31 UTC, Kagamin wrote:
> On Saturday, 11 July 2020 at 10:42:20 UTC, Remi wrote:
>> That's great thanks! I didn't think of checking in that original docs, duh! It now compiles the game code but not some dependencies, I'll need to resolve issues regarding the std it seems as I think that changed since then.
>
> Undead package contains code from old phobos for such cases.

I did indeed get most of the code to compile with undead! Thanks for the pointer! I'm now trying to find docs on the "bit" type.