panic: unsupported key type *foo

[jeremy-giaco]

Apparently it is not currently possible to add a reference to a struct as a key in the hashmap. This is valid in the native map, sync.Map, etc.

In this example, i create an "Attribute" and "Value" struct, then try to create a map of key: *Attribute, value:*Value...
https://play.golang.org/p/m2RkogzD-82

Error returned is: panic: unsupported key type *main.Attribute

[jeremy-giaco]

Of note, i could use the "Attribute.ID" in my example as the key of the hashmap, then use the *Value as the value, but since in my code I am already looking up the attribute by Name, i have no desire to dereference it in order to get it's ID before interogating the map for values of a certain Attribute/Value combination.

Also of note, I'm pretty new to Go, and don't really know what i'm doing, lol.

[tigrato]

@jeremy-giaco the issue is triggered when trying to compute the hash for the key. This lib supports the following keys

hashmap/util.go

Line 44 in c93d96c

func getKeyHash(key interface{}) uintptr {

sync.Map uses the internal map hash function which dereferences the pointer and uses memory value to compute the hash which this lib does not support

[kant777]

still not supported?