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##### basic_waitable_timer::basic_waitable_timer (2 of 7 overloads)

Constructor.

    template<
        typename ExecutionContext>
    basic_waitable_timer(
        ExecutionContext & context,
        typename enable_if< is_convertible< ExecutionContext &, execution_context & >::value >::type *  = 0);

This constructor creates a timer without setting an expiry time. The `expires_at()` or `expires_after()` functions must be called to set an expiry time before the timer can be waited on.

###### Parameters

context

  An execution context which provides the I/O executor that the timer will use, by default, to dispatch handlers for any asynchronous operations performed on the timer.