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digitalmars.D.learn - Structured binding declaration (like in C++)

reply Vindex <tech.vindex gmail.com> writes:
Is there a decomposition for tuples and other data structures?

For example,
```
auto t = tuple(1, "2");
auto (x, y) = t; // or auto (x, y) = t.expand;
```
Oct 13 2021
next sibling parent =?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:
On 10/13/21 1:02 PM, Vindex wrote:

 Is there a decomposition for tuples and other data structures?
 
 For example,
 ```
 auto t = tuple(1, "2");
 auto (x, y) = t; // or auto (x, y) = t.expand;
 ```


No, D does not have this (yet?).

I thought there was a special case for tuples with foreach but I can't 
remember it now. (?)

Ali
Oct 14 2021
prev sibling parent reply MoonlightSentinel <moonlightsentinel disroot.org> writes:
On Wednesday, 13 October 2021 at 20:02:05 UTC, Vindex wrote:

 Is there a decomposition for tuples and other data structures?


No, but you can emulate it, e.g. by using AliasSeq:

```d
import std.meta : AliasSeq;
import std.typecons : tuple;
import std.stdio : writeln;

void main() {
     int a;
     string b;
     AliasSeq!(a, b) = tuple(1, "hello");

     writeln("a = ", a);
     writeln("b = ", b);
}
```

https://run.dlang.io/is/aUEtSK
Oct 14 2021
parent Vindex <tech.vindex gmail.com> writes:
On Thursday, 14 October 2021 at 15:29:13 UTC, MoonlightSentinel 
wrote:

 On Wednesday, 13 October 2021 at 20:02:05 UTC, Vindex wrote:

 Is there a decomposition for tuples and other data structures?


 No, but you can emulate it, e.g. by using AliasSeq:

 ```d
 import std.meta : AliasSeq;
 import std.typecons : tuple;
 import std.stdio : writeln;

 void main() {
     int a;
     string b;
     AliasSeq!(a, b) = tuple(1, "hello");

     writeln("a = ", a);
     writeln("b = ", b);
 }
 ```

 https://run.dlang.io/is/aUEtSK


Thank you! This is a good variant of decision of the problem
Oct 14 2021