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| SourceGroup (const IPvX& source_addr, const IPvX& group_addr) | SourceGroup | 
Constructor for a source and a group address.
Parameters:
| source_addr | the source address. | 
| group_addr | the group address. | 
| const IPvX&  source_addr () | source_addr | 
[const]
Get the source address.
Returns: the source address.
| const IPvX&  group_addr () | group_addr | 
[const]
Get the group address.
Returns: the group address.