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Endpoint requirements

An endpoint must meet the requirements of CopyConstructible types (C++ Std, 20.1.3), and the requirements of Assignable types (C++ Std, 23.1).

In the table below, X denotes an endpoint class, a denotes a value of type X, s denotes a size in bytes, and u denotes an identifier.

Table10.Endpoint requirements

expression

type

assertion/note
pre/post-conditions

X::protocol_type

type meeting protocol requirements

X u;

X();

a.protocol();

protocol_type

a.data();

a pointer

Returns a pointer suitable for passing as the address argument to POSIX functions such as accept(), getpeername(), getsockname() and recvfrom(). The implementation shall perform a reinterpret_cast on the pointer to convert it to sockaddr*.

const X& u = a; u.data();

a pointer

Returns a pointer suitable for passing as the address argument to POSIX functions such as connect(), or as the dest_addr argument to POSIX functions such as sendto(). The implementation shall perform a reinterpret_cast on the pointer to convert it to const sockaddr*.

a.size();

size_t

Returns a value suitable for passing as the address_len argument to POSIX functions such as connect(), or as the dest_len argument to POSIX functions such as sendto(), after appropriate integer conversion has been performed.

a.resize(s);

post: a.size() == s
Passed the value contained in the address_len argument to POSIX functions such as 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 POSIX functions such as accept(), getpeername(), getsockname() and recvfrom(), after appropriate integer conversion has been performed.



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