• Ram_B (18/18) Sep 15 2016 How i can get fields of derived classes in runtime? This not works
• rikki cattermole (4/22) Sep 15 2016 A few weeks ago I wrote an article for TWID that covers this very subjec...
• Gary Willoughby (26/28) Sep 15 2016 What about something like this:
• Ram_B (3/31) Sep 15 2016 Thanks very much! :3
• Ram_B (36/64) Sep 15 2016 This works, but i can't use (get|has)Member
• Gary Willoughby (2/7) Sep 16 2016 Maybe Array!(string) can't be use in compile-time code?
• Ram_B (3/10) Sep 16 2016 Which type of array i may use to pass it to compile-time function?

Ram_B <zvolkzrus gmail.com> writes:

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();
}

rikki cattermole <rikki cattermole.co.nz> writes:

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

Gary Willoughby <dev nomad.so> writes:

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();
}

Ram_B <zvolkzrus gmail.com> writes:

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

Ram_B <zvolkzrus gmail.com> writes:

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

Gary Willoughby <dev nomad.so> writes:

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?

Ram_B <zvolkzrus gmail.com> writes:

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?