A type X meets the Protocol requirements if it satisfies the requirements of Destructible (C++ 2014 [destructible]), CopyConstructible (C++ 2014 [copyconstructible]), and CopyAssignable (C++ 2014 [copyassignable]), as well as the additional requirements listed below.
| expression | return type | assertion/note pre/post-conditions |
| X::endpoint | type meeting endpoint ([socket.reqmts.endpoint]) requirements |
In the table below, a denotes a (possibly const) value of type X.
| expression | return type | assertion/note pre/post-conditions |
| a.family() | int | Returns a value suitable for passing as the domain argument to POSIX socket (or equivalent). |
| a.type() | int | Returns a value suitable for passing as the type argument to POSIX socket (or equivalent). |
| a.protocol() | int | Returns a value suitable for passing as the protocol argument to POSIX socket (or equivalent). |