Boost C++ Libraries

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Object handle service requirements

An object handle service must meet the requirements for a handle service, as well as the additional requirements listed below.

In the table below, X denotes an object handle service class, a denotes a value of type X, b denotes a value of type X::implementation_type, ec denotes a value of type error_code, and wh denotes a value meeting WaitHandler requirements.

Table 19. ObjectHandleService requirements

expression

return type

assertion/note
pre/post-condition

a.wait(b, ec);

error_code

pre: a.is_open(b).

Synchronously waits for the object represented by handle b to become signalled.

a.async_wait(b, wh);

void

pre: a.is_open(b).

Initiates an asynchronous operation to wait for the object represented by handle b to become signalled. The operation is performed via the io_service object a.get_io_service() and behaves according to asynchronous operation requirements.



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