func (t *MockTracer) Extract(format interface{}, carrier interface{}) (opentracing.SpanContext, error) {
	extractor, ok := t.extractors[format]
	if !ok {
		return nil, opentracing.ErrUnsupportedFormat
	}
	return extractor.Extract(carrier)
}
func (t *MockTracer) Extract(format interface{}, carrier interface{}) (opentracing.SpanContext, error) {
	extractor, ok := t.extractors[format]
	if !ok {
		return nil, opentracing.ErrUnsupportedFormat
	}
	return extractor.Extract(carrier)
}
func ( t * MockTracer ) Extract ( format interface { } , carrier interface { } ) ( opentracing . SpanContext , error ) { extractor , ok := t . extractors [ format ] if ! ok { return nil , opentracing . ErrUnsupportedFormat } return extractor . Extract ( carrier ) }
// Extract belongs to the Tracer interface.
Extract belongs to the Tracer interface .