How i can get fields of derived classes in runtime? This not works

import std.traits;
import std.experimental.logger;


class A {
	int a,b;
	this(){}
	void fields(){
		log(FieldNameTuple!this);	
	}
}

class B : A{
	int c;
	this(){}
}

void main(){
	B b = new B();
	b.fields();
}

On 16/09/2016 3:07 AM, Ram_B wrote:
> How i can get fields of derived classes in runtime? This not works
>
> import std.traits;
> import std.experimental.logger;
>
>
> class A {
>     int a,b;
>     this(){}
>     void fields(){
>         log(FieldNameTuple!this);
>     }
> }
>
> class B : A{
>     int c;
>     this(){}
> }
>
> void main(){
>     B b = new B();
>     b.fields();
> }

A few weeks ago I wrote an article for TWID that covers this very subject.
Sadly because of a bug in dmd it doesn't work for all cases perfectly.

http://arsdnet.net/this-week-in-d/2016-aug-28.html

On Thursday, 15 September 2016 at 15:07:09 UTC, Ram_B wrote:
> How i can get fields of derived classes in runtime? This not works

What about something like this:

import std.traits;
import std.stdio;

class A {
	int a,b;
	this(){}
	void fields(this T)(){
        writeln(FieldNameTuple!(T));
        foreach(Class; TransitiveBaseTypeTuple!(T)) {
            writeln(FieldNameTuple!(Class));
        }
	}
}

class B : A{
	int c;
	this(){}
}

class C : B{
	int d;
	this(){}
}
void main(){
	C c = new C();
	c.fields();
}

On Thursday, 15 September 2016 at 15:56:56 UTC, Gary Willoughby wrote:
> On Thursday, 15 September 2016 at 15:07:09 UTC, Ram_B wrote:
>> How i can get fields of derived classes in runtime? This not works
>
> What about something like this:
>
> import std.traits;
> import std.stdio;
>
> class A {
> 	int a,b;
> 	this(){}
> 	void fields(this T)(){
>         writeln(FieldNameTuple!(T));
>         foreach(Class; TransitiveBaseTypeTuple!(T)) {
>             writeln(FieldNameTuple!(Class));
>         }
> 	}
> }
>
> class B : A{
> 	int c;
> 	this(){}
> }
>
> class C : B{
> 	int d;
> 	this(){}
> }
> void main(){
> 	C c = new C();
> 	c.fields();
> }

Thanks very much! :3

On Thursday, 15 September 2016 at 15:56:56 UTC, Gary Willoughby wrote:
> On Thursday, 15 September 2016 at 15:07:09 UTC, Ram_B wrote:
>> How i can get fields of derived classes in runtime? This not works
>
> What about something like this:
>
> import std.traits;
> import std.stdio;
>
> class A {
> 	int a,b;
> 	this(){}
> 	void fields(this T)(){
>         writeln(FieldNameTuple!(T));
>         foreach(Class; TransitiveBaseTypeTuple!(T)) {
>             writeln(FieldNameTuple!(Class));
>         }
> 	}
> }
>
> class B : A{
> 	int c;
> 	this(){}
> }
>
> class C : B{
> 	int d;
> 	this(){}
> }
> void main(){
> 	C c = new C();
> 	c.fields();
> }

This works, but i can't use (get|has)Member
class A{
	int a, b;
    Array!string fields(this T)(){
        Array!string list;
        foreach(field; FieldNameTuple!(T)){
            list.insertBack(field);
        }
        foreach(Class; TransitiveBaseTypeTuple!(T)){
            foreach(field; FieldNameTuple!(Class)){
                list.insertBack(field);
            }
        }
        return list;
    }
	void t(this T)(){
		foreach(f; this.fields()){
			log(__traits(hasMember, T, f));		
		}
	}
}

class B : A{
	int c;
	this(){}
}

void main(){
	B b = new B();
	b.t();
}

test.d(33): Error: variable f cannot be read at compile time
test.d(33): Error: string expected as second argument of __traits hasMember instead of __error
test.d(46): Error: template instance test.A.t!(B) error instantiating

On Thursday, 15 September 2016 at 22:05:55 UTC, Ram_B wrote:
> test.d(33): Error: variable f cannot be read at compile time
> test.d(33): Error: string expected as second argument of __traits hasMember instead of __error
> test.d(46): Error: template instance test.A.t!(B) error instantiating

Maybe Array!(string) can't be use in compile-time code?

On Friday, 16 September 2016 at 08:01:18 UTC, Gary Willoughby wrote:
> On Thursday, 15 September 2016 at 22:05:55 UTC, Ram_B wrote:
>> test.d(33): Error: variable f cannot be read at compile time
>> test.d(33): Error: string expected as second argument of __traits hasMember instead of __error
>> test.d(46): Error: template instance test.A.t!(B) error instantiating
>
> Maybe Array!(string) can't be use in compile-time code?

Which type of array i may use to pass it to compile-time function?