func DataCentreHostFilter(dataCentre string) HostFilter {
	return HostFilterFunc(func(host *HostInfo) bool {
		return host.DataCenter() == dataCentre
	})
}
DataCentreHostFilter filters all hosts such that they are in the same data centre
as the supplied data centre.
package gocql
type HostFilter interface {
	Accept(host *HostInfo) bool
}
type HostFilterFunc func(host *HostInfo) bool
func (fn HostFilterFunc) Accept(host *HostInfo) bool {
	return fn(host)
}
func AcceptAllFilter() HostFilter {
	return HostFilterFunc(func(host *HostInfo) bool {
		return true
	})
}
func DenyAllFilter() HostFilter {
	return HostFilterFunc(func(host *HostInfo) bool {
		return false
	})
}