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### Socket acceptor service requirements

A socket acceptor service must meet the requirements for an I/O object service, as well as the additional requirements listed below.

In the table below, `X` denotes a socket acceptor service class for protocol `Protocol`, `a` denotes a value of type `X`, `b` denotes a value of type `X::implementation_type`, `p` denotes a value of type `Protocol`, `n` denotes a value of type `X::native_type`, `e` denotes a value of type `Protocol::endpoint`, `ec` denotes a value of type `error_code`, `s` denotes a value meeting `SettableSocketOption` requirements, `g` denotes a value meeting `GettableSocketOption` requirements, `i` denotes a value meeting `IoControlCommand` requirements, `k` denotes a value of type `basic_socket<Protocol, SocketService>` where `SocketService` is a type meeting socket service requirements, `ah` denotes a value meeting `AcceptHandler` requirements, and `u` and `v` denote identifiers.

Table 26. SocketAcceptorService requirements

expression | return type | assertion/note pre/post-condition
--- | --- | ---
`X::native_type` |  | The implementation-defined native representation of a socket acceptor. Must satisfy the requirements of `CopyConstructible` types (C++ Std, 20.1.3), and the requirements of `Assignable` types (C++ Std, 23.1).
`a.construct(b);` |  | From IoObjectService requirements. post: `!a.is_open(b)`.
`a.destroy(b);` |  | From IoObjectService requirements. Implicitly cancels asynchronous operations, as if by calling `a.close(b, ec)`.

    a.open(b, p, ec);

`error_code`

pre: `!a.is_open(b)`.
post: `!!ec || a.is_open(b)`.

    a.assign(b, p, n, ec);

`error_code`

pre: `!a.is_open(b)`.
post: `!!ec || a.is_open(b)`.

    a.is_open(b);

`bool`

    const X& u = a;
    const X::implementation_type& v = b;
    u.is_open(v);

`bool`

    a.close(b, ec);

`error_code`

If `a.is_open()` is true, causes any outstanding asynchronous operations to complete as soon as possible. Handlers for cancelled operations shall be passed the error code `error::operation_aborted`.
post: `!a.is_open(b)`.

    a.native(b);

`X::native_type`

    a.cancel(b, ec);

`error_code`

pre: `a.is_open(b)`.
Causes any outstanding asynchronous operations to complete as soon as possible. Handlers for cancelled operations shall be passed the error code `error::operation_aborted`.

    a.set_option(b, s, ec);

`error_code`

pre: `a.is_open(b)`.

    a.get_option(b, g, ec);

`error_code`

pre: `a.is_open(b)`.

    const X& u = a;
    const X::implementation_type& v = b;
    u.get_option(v, g, ec);

`error_code`

pre: `a.is_open(b)`.

    a.io_control(b, i, ec);

`error_code`

pre: `a.is_open(b)`.

    const typename Protocol::endpoint& u = e;
    a.bind(b, u, ec);

`error_code`

pre: `a.is_open(b)`.

    a.local_endpoint(b, ec);

`Protocol::endpoint`

pre: `a.is_open(b)`.

    const X& u = a;
    const X::implementation_type& v = b;
    u.local_endpoint(v, ec);

`Protocol::endpoint`

pre: `a.is_open(b)`.

    a.accept(b, k, &e, ec);

`error_code`

pre: `a.is_open(b) && !k.is_open()`.
post: `k.is_open()`

    a.accept(b, k, 0, ec);

`error_code`

pre: `a.is_open(b) && !k.is_open()`.
post: `k.is_open()`

    a.async_accept(b, k, &e, ah);

pre: `a.is_open(b) && !k.is_open()`.
Initiates an asynchronous accept operation that is performed via the `io_service` object `a.io_service()` and behaves according to asynchronous operation requirements.
The program must ensure the objects `k` and `e` are valid until the handler for the asynchronous operation is invoked.

    a.async_accept(b, k, 0, ah);

pre: `a.is_open(b) && !k.is_open()`.
Initiates an asynchronous accept operation that is performed via the `io_service` object `a.io_service()` and behaves according to asynchronous operation requirements.
The program must ensure the object `k` is valid until the handler for the asynchronous operation is invoked.