A type X meets the Endpoint requirements if it satisfies the requirements of Destructible (C++ 2014 [destructible]), DefaultConstructible (C++ 2014 [defaultconstructible]), CopyConstructible (C++ 2014 [copyconstructible]), and CopyAssignable (C++ 2014 [copyassignable]), as well as the additional requirements listed below.
In the table below, a denotes a (possibly const) value of type X, and u denotes an identifier.
| expression | type | assertion/note pre/post-conditions |
| X::protocol_type | type meeting Protocol ([socket.reqmts.protocol]) requirements | |
| a.protocol() | protocol_type |
In the table below, a denotes a (possibly const) value of type X, b denotes a value of type X, and s denotes a (possibly const) value of a type that is convertible to size_t and denotes a size in bytes.
| expression | type | assertion/note pre/post-conditions |
| a.data() | const void* | Returns a pointer suitable for passing as the address argument to functions such as POSIX connect, or as the dest_addr argument to functions such as POSIX sendto. The implementation shall perform a static_cast on the pointer to convert it to const sockaddr*. |
| b.data() | void* | Returns a pointer suitable for passing as the address argument to functions such as POSIX accept, getpeername, getsockname and recvfrom. The implementation shall perform a static_cast on the pointer to convert it to sockaddr*. |
| a.size() | size_t | Returns a value suitable for passing as the address_len argument to functions such as POSIX connect, or as the dest_len argument to functions such as POSIX sendto, after appropriate integer conversion has been performed. |
| b.resize(s) |
pre: s >= 0 post: a.size() == s Passed the value contained in the address_len argument to functions such as POSIX accept, getpeername, getsockname, and recvfrom, after successful completion of the function. Permitted to throw an exception if the protocol associated with the endpoint object a does not support the specified size. | |
| a.capacity() | size_t | Returns a value suitable for passing as the address_len argument to functions such as POSIX accept, getpeername, getsockname, and recvfrom, after appropriate integer conversion has been performed. |