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Determine if an execution_context contains a specified
service type.
template< typename Service> friend bool has_service( execution_context & e);
This function is used to determine whether the execution_context contains a service
object corresponding to the given service type.
The execution_context object
that owns the service.
A boolean indicating whether the execution_context contains the
service.
Header: asio/execution_context.hpp
Convenience header: asio.hpp