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Clarify IPv4 vs IPv6 semantics of multicast::outbound_interface #1702

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Clarify IPv4 vs IPv6 semantics of multicast::outbound_interface #1702

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4 changes: 4 additions & 0 deletions include/asio/ip/multicast.hpp
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Expand Up @@ -85,6 +85,10 @@ typedef asio::ip::detail::socket_option::multicast_request<
/**
* Implements the IPPROTO_IP/IP_MULTICAST_IF socket option.
*
* For IPv4, the outbound interface may be specified using an IPv4 address.
* For IPv6, an interface index must be used, since an IPv6 address does not
* uniquely identify a network interface.
*
* @par Examples
* Setting the option:
* @code
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