Re: key membership in multi-dimensional assoc. array
On Thursday, 15 June 2023 at 02:21:16 UTC, Steven Schveighoffer
wrote:
Not in as short code. You could write a helper though:
```d
auto deepIn(V, K, Keys...)(V[K] aa, Keys keys) if (Keys.length
> 0)
{
auto v = keys[0] in aa;
static if(keys.length == 1)
return v;
else
return v ? deepIn(*v, keys[1 .. $]) : null;
}
if(auto v = cubelist.deepIn(xKey, yKey, zKey)) { // v now
points at the value
}
```
-Steve
Thanks Steve.
Re: key membership in multi-dimensional assoc. array
On 6/14/23 9:47 PM, Paul wrote:
I found I can check for key membership in a multi-D aa...
```d
byte zKey = someval;
byte[byte][byte][byte] cubelist;
foreach(byte xK, yzcubelist; cubelist) {
foreach(byte yK, zcubelist; yzcubelist) {
foreach(byte zK, val; zcubelist) {
```
with this expression...
```d
if(zKey in cubelist[xK][yK])
```
Is there a way to check for membership in the x & y dimensions?
```d
if(yKey in cubelist[xK] ??? [zK])
```
*Thanks in advance for any ideas or solutions.*
Not in as short code. You could write a helper though:
```d
auto deepIn(V, K, Keys...)(V[K] aa, Keys keys) if (Keys.length > 0)
{
auto v = keys[0] in aa;
static if(keys.length == 1)
return v;
else
return v ? deepIn(*v, keys[1 .. $]) : null;
}
if(auto v = cubelist.deepIn(xKey, yKey, zKey)) { // v now points at the
value
}
```
-Steve
Re: key membership in multi-dimensional assoc. array
On Thursday, 15 June 2023 at 01:47:45 UTC, Paul wrote:
I found I can check for key membership in a multi-D aa...
```d
byte zKey = someval;
byte[byte][byte][byte] cubelist;
foreach(byte xK, yzcubelist; cubelist) {
foreach(byte yK, zcubelist; yzcubelist) {
foreach(byte zK, val; zcubelist) {
```
with this expression...
```d
if(zKey in cubelist[xK][yK])
```
Is there a way to check for membership in the x & y dimensions?
```d
if(yKey in cubelist[xK] ??? [zK])
```
*Thanks in advance for any ideas or solutions.*
`&&`
key membership in multi-dimensional assoc. array
I found I can check for key membership in a multi-D aa...
```d
byte zKey = someval;
byte[byte][byte][byte] cubelist;
foreach(byte xK, yzcubelist; cubelist) {
foreach(byte yK, zcubelist; yzcubelist) {
foreach(byte zK, val; zcubelist) {
```
with this expression...
```d
if(zKey in cubelist[xK][yK])
```
Is there a way to check for membership in the x & y dimensions?
```d
if(yKey in cubelist[xK] ??? [zK])
```
*Thanks in advance for any ideas or solutions.*
