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Describe why win_iocp_operation inherits from OVERLAPPED.

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chris_kohlhoff 2005-12-09 05:15:06 +00:00
parent f2f91144bc
commit e17b093fd7
1 changed files with 4 additions and 0 deletions
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asio/include/asio/detail/win_iocp_operation.hpp
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@ -34,6 +34,10 @@ class win_iocp_demuxer_service;
// Base class for all IOCP operations. A function pointer is used instead of // Base class for all IOCP operations. A function pointer is used instead of
// virtual functions to avoid the associated overhead. // virtual functions to avoid the associated overhead.
//
// This class inherits from OVERLAPPED so that we can downcast to get back to
// the win_iocp_operation pointer from the LPOVERLAPPED out parameter of
// GetQueuedCompletionStatus.
struct win_iocp_operation struct win_iocp_operation
: public OVERLAPPED : public OVERLAPPED
{ {