Reset to empty.

void reset();
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Reset to contain the specified handler, freeing any current OVERLAPPED object.

template<
    typename ExecutionContext,
    typename Handler>
void reset(
    ExecutionContext & context,
    Handler && handler,
    typename constraint< is_convertible< ExecutionContext &, execution_context & >::value >::type  = 0);
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template<
    typename Executor,
    typename Handler>
void reset(
    const Executor & ex,
    Handler && handler,
    typename constraint< execution::is_executor< Executor >::value||is_executor< Executor >::value >::type  = 0);
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