:sig
bool DValue::is_reference() const

:params
return value : true when this node itself is a reference node

:see
0_DValue
2_DValue_reference_target
2_DValue_deref

:content
Reports whether the current node's direct type tag is the internal reference tag. Most read methods dereference automatically; this helper is mainly useful when handling reference-aware runtime state.

```cpp
if(value.is_reference()) print("reference");
```