• =?UTF-8?B?TcOhcmNpbw==?= Martins (46/46) Oct 23 2019 Hi!
• Dennis (7/9) Oct 23 2019 An alias refers just to a symbol, in this case a member function
• Dennis (6/8) Oct 23 2019 Wait, but that's only because the local alias and member function

=?UTF-8?B?TcOhcmNpbw==?= Martins <marcioapm gmail.com> writes:

Hi!

Consider this simplified program:
```
import std.stdio;

struct X {
     void method(int x) {
         writeln("method called");
     }
}


void main() {
     X x;

     foreach (member; __traits(allMembers, X)) {
         alias method = __traits(getMember, x, member);
         method(1);
     }
}
```

Output:
test.d(15): Error: need this for method of type void(int x)



This one as well:
```
import std.stdio;

struct X {
     void method(int x) {
         writeln("method(int) called");
     }
}


struct Y {
     void method(ref X x) {
         foreach (member; __traits(allMembers, X)) {
             alias method = __traits(getMember, x, member);
             method(1);
         }
     }
}


void main() {
     Y y;
     X x;
     y.method(x);
}
```

Output:
```test.d(14): Error: this for method needs to be type X not type 
Y```


This is a bug, right? If not, why, and how can I get around it 
and call `method`?

Dennis <dkorpel gmail.com> writes:

On Wednesday, 23 October 2019 at 11:40:09 UTC, Márcio Martins 
wrote:
 This is a bug, right? If not, why, and how can I get around it 
 and call `method`?

An alias refers just to a symbol, in this case a member function 
of struct X.
The fact that you polled it on instance 'x' is not something an 
alias keeps track of.
You can change `method(1)` into `x.method(1)` and it should work.

Dennis <dkorpel gmail.com> writes:

On Wednesday, 23 October 2019 at 11:48:29 UTC, Dennis wrote:
 You can change `method(1)` into `x.method(1)` and it should 
 work.

Wait, but that's only because the local alias and member function 
have the same name 'method'.
I think you just have to keep the method name as a string instead 
of an alias and use ` __traits(getMember, x, member)(3);` the 
moment you want to call it.