:sig
bool DValue::is_list() const

:params
return value : true when the value is an array with keys 0..n-1

:see
0_DValue
2_DValue_set_array
2_DValue_push

:content
Returns true for map-shaped values that represent a list. An empty map is a list only if it was explicitly put in list mode with `set_array()` or by list operations. Non-empty lists must have canonical numeric string keys from `0` through `size - 1`.

```cpp
DValue first; first = "first";
DValue items; items.set_array(); items.push(first);
if(items.is_list()) print(json_encode(items));
```