```d
#!opend test app
import std;
struct intutisive(alias Array,discrim...){
static Array array; alias array this;
//this(){
// array~=typeof(array[0]);
//}
auto opIndex(I)(I i){
static struct handle{
I i;
ref get()=>array[i]; alias get this;
string toString()=>get.to!string;
auto children(){
static struct kidhandle{
I i;
ref front()=>array[i];
void popFront(){i=front.sib;}
bool empty()=>i==0;
//void opOpAssign(string op:"~")(handle a){//I dont think
this works without a parent pointer
// a.sib=front.sib;
// front.sib=a.i;
//}
}
return kidhandle(get.kid);
}
void addchild(handle a){
a.sib=get.kid;
get.kid=cast(typeof(get.kid))a.i;
}
}
return handle(i);
}
auto length()=>array.length-1;
auto opSlice()=>iota(1,array.length).map!(i=>opIndex(i));
}
struct data{
string name;
ubyte kid;
ubyte sib;
}
intutisive!(data[]) foo;
unittest{
foo~=data("");
foo~=data("hi");
assert(foo[1].children.empty);
foo~=data("bye");
foo[1].kid=2;
assert(foo[1].children.front.name=="bye");
foo[].writeln;
//---
foo~=data("cow");
foo~=data("moo");
foo[].filter!(a=>a.name=="cow").front.addchild(
foo[].filter!(a=>a.name=="moo").front );
foo[].writeln;
}
```
https://www.youtube.com/watch?v=ShSGHb65f3M
I feel like im missing something. Maybe it cant fit cleanly into
ranges but idk.
