If a value for key in asv is present and is of the desired type, return it.
Otherwise return null.
The returned value is not copied, and is only valid as long as the value for key in asv is not removed or
altered. Copy it, for instance with g_boxed_copy, if you need to keep it for longer.
| asv |
A GHashTable where the keys are strings and the values are GValues |
| key |
The key to look up |
| type |
The type that the key's value should have, which must be derived from BOXED |
|
the value of |