• "Simen kjaeraas" <simen.kjaras gmail.com> Jun 27 2010
• Philippe Sigaud <philippe.sigaud gmail.com> Jun 27 2010

"Simen kjaeraas" <simen.kjaras gmail.com> writes:

auto fn1 = ( string s ) {
	return s;
};

auto fn2 = ( string s ) {
	return map!fn1( [""] );
};

auto idirs = map!fn2( [""] );

The above code gives the following errors:
foo.d(114): Error: struct foo.main.Map!(fn2,string[]).Map inner struct
Map cannot be a field
foo.d(114): Error: struct foo.main.Map!(fn2,string[]).Map inner struct
Map cannot be a field

As far as I can see, this has to do with struct rules, but I can't see
how to fix it. Should I file this in bugzilla?

-- 
Simen

Philippe Sigaud <philippe.sigaud gmail.com> writes:

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On Sun, Jun 27, 2010 at 10:11, Simen kjaeraas <simen.kjaras gmail.com>wrote:

 auto fn1 = ( string s ) {
        return s;
 };

 auto fn2 = ( string s ) {
        return map!fn1( [""] );
 };

 auto idirs = map!fn2( [""] );

 The above code gives the following errors:
 foo.d(114): Error: struct foo.main.Map!(fn2,string[]).Map inner struct
 Map cannot be a field
 foo.d(114): Error: struct foo.main.Map!(fn2,string[]).Map inner struct
 Map cannot be a field

 As far as I can see, this has to do with struct rules, but I can't see
 how to fix it. Should I file this in bugzilla?


means the function you passed to (the outer) Map is not correct, be it a
template that has trouble instantiating, a type mismatch or some frame
pointer that got lost.
In your case, I guess there is a bug somewhere concerning the passing around
of delegates. If you get rid of delegates (which is not what you want, I
know), it works:

string fn1(string s) { return s;}
auto fn2(string s) { return map!fn1([""]);}

void main()
{
    auto idirs = map!fn2([""]); // works.
}

I tried defining fn1 inside fn2, but it does not work. Too bad.


Philippe

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<div class=3D"gmail_quote">On Sun, Jun 27, 2010 at 10:11, Simen kjaeraas <s=
pan dir=3D"ltr">&lt;<a href=3D"mailto:simen.kjaras gmail.com">simen.kjaras =
gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=
=3D"margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); p=
adding-left: 1ex;">
auto fn1 =3D ( string s ) {<br>
 =A0 =A0 =A0 =A0return s;<br>
};<br>
<br>
auto fn2 =3D ( string s ) {<br>
 =A0 =A0 =A0 =A0return map!fn1( [&quot;&quot;] );<br>
};<br>
<br>
auto idirs =3D map!fn2( [&quot;&quot;] );<br>
<br>
The above code gives the following errors:<br>
foo.d(114): Error: struct foo.main.Map!(fn2,string[]).Map inner struct<br>
Map cannot be a field<br>
foo.d(114): Error: struct foo.main.Map!(fn2,string[]).Map inner struct<br>
Map cannot be a field<br>
<br>
As far as I can see, this has to do with struct rules, but I can&#39;t see<=
br>
how to fix it. Should I file this in bugzilla?<br><br></blockquote><div><br=
I&#39;ve had this particular error dozens of time :-(=A0=A0 Most of the ti=


it a template that has trouble instantiating, a type mismatch or some frame=
 pointer that got lost.<br>
In your case, I guess there is a bug somewhere concerning the passing aroun=
d of delegates. If you get rid of delegates (which is not what you want, I =
know), it works:<br><br>string fn1(string s) { return s;}<br>auto fn2(strin=
g s) { return map!fn1([&quot;&quot;]);}<br>
<br>void main()<br>{<br>=A0=A0=A0 auto idirs =3D map!fn2([&quot;&quot;]); /=
/ works.<br>}<br><br>I tried defining fn1 inside fn2, but it does not work.=
 Too bad.<br><br><br>Philippe<br><br><br><br></div></div>

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