description

# Gauge constructor Null safety

Gauge(

1. String name,
2. String description,
3. double min,
4. double max

)

## Implementation

    Gauge(String name, String description, this.min, this.max)
        : _value = min,
          super(name, description) {
      // TODO: When NNBD is complete, delete the following two lines.
      ArgumentError.checkNotNull(min, 'min');
      ArgumentError.checkNotNull(max, 'max');
      if (!(min < max)) throw new ArgumentError('min must be less than max');
    }