• Jonathan Marler (18/18) Jan 09 2015 import std.stdio;
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (12/29) Jan 09 2015 Broken documentation presumable because the feature changed later on.

"Jonathan Marler" <johnnymarler gmail.com> writes:

import std.stdio;
import std.typecons;
void main()
{
   alias TL = Tuple!(int, long, float);
   foreach (i, T; TL)
     writefln("TL[%d] = %s", i, typeid(T));
}

Why is this not working?

D:\dmd2\windows\bin\..\..\src\phobos\std\typecons.d(419): Error: 
need 'this' for '_expand_field_0' of type 'int'
D:\dmd2\windows\bin\..\..\src\phobos\std\typecons.d(419): Error: 
need 'this' for '_expand_field_1' of type 'long'
D:\dmd2\windows\bin\..\..\src\phobos\std\typecons.d(419): Error: 
need 'this' for '_expand_field_2' of type 'float'

Tried to compile using dmd 2.066 and dmd 2.067.  Code taken 
directly from dlang website here (http://dlang.org/tuple.html). 
Thanks.

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 01/09/2015 10:42 AM, Jonathan Marler wrote:
 import std.stdio;
 import std.typecons;
 void main()
 {
    alias TL = Tuple!(int, long, float);
    foreach (i, T; TL)
      writefln("TL[%d] = %s", i, typeid(T));
 }

 Why is this not working?

 D:\dmd2\windows\bin\..\..\src\phobos\std\typecons.d(419): Error: need
 'this' for '_expand_field_0' of type 'int'
 D:\dmd2\windows\bin\..\..\src\phobos\std\typecons.d(419): Error: need
 'this' for '_expand_field_1' of type 'long'
 D:\dmd2\windows\bin\..\..\src\phobos\std\typecons.d(419): Error: need
 'this' for '_expand_field_2' of type 'float'

 Tried to compile using dmd 2.066 and dmd 2.067.  Code taken directly
 from dlang website here (http://dlang.org/tuple.html). Thanks.

Broken documentation presumable because the feature changed later on. 
The code works if you we std.typetuple.TypeTuple:

import std.stdio;
import std.typetuple;

void main()
{
   alias TL = TypeTuple!(int, long, float);
   foreach (i, T; TL)
       writefln("TL[%d] = %s", i, typeid(T));
}

Ali