Custom opCmp for struct array sort

[New]

Hello,

Thanks for cleaning up the code, I was getting a bit annoyed with the all the invariants, but I did not know how to get rid of them.

I tried your version but still the opCmp is not called  :(

I will try on D.learn

thanks very much



bearophile Wrote:

> New:
> > When I sort these paths, in the case of symlinks I want to ignore the right hand side and I just use the path before the "=" sign.
> 
> This may work (D1), I have cleaned up your code some:
> 
> import std.string: find, cmp;
> import std.stdio: writefln;
> 
> struct Path {
>     string thePath;
> 
>     int opCmp(Path other) {
>         int pos;
>         string a, b;
> 
>         pos = find(this.thePath, "=");
>         if (pos > -1)
>             a = this.thePath[0 .. pos];
>         else
>             a = this.thePath;
> 
>         pos = find(other.thePath, "=");
>         if (pos > -1)
>             b = other.thePath[0 .. pos];
>         else
>             b = other.thePath;
> 
>         return cmp(a, b);
>     }
> }
> 
> void main() {
>     string[][Path] contents = [
>         Path("/002=/other_dir"): ["aa","bb","cc","dd"],
>         Path("/001"): ["aa","bb","cc","dd"],
>         Path("/002=/hello") : ["aa","bb","cc","dd"]
>     ];
> 
>     foreach (item; contents.keys.sort)
>         writefln(item.thePath);
> }
> 
> Note that you may not need it, because the part before = is on the left, so just sorting the strings may give you the order you need, without using any opCmp.
> 
> For other similar questions the D.learn newsgroup is fitter.
> 
> Bye,
> bearophile