added QueryableOpinion interface

Author: berb

pkg/subjectivelogic/Opinion.go

@@ -37,6 +37,17 @@ type Opinion struct {
 	baseRate    float64
 }
 
+/*
+An interface to query binomial opinions from subjective logic.
+Provided to increase compatibility with other SL implementations.
+*/
+type QueryableOpinion interface {
+	GetBelief() float64
+	GetDisbelief() float64
+	GetUncertainty() float64
+	GetBaseRate() float64
+}
+
 /*
 NewOpinion takes four float64 values and outputs an *Opinion as well as an Error.
 In case a valid Opinion can be formed, it will be returned and the error will be nil.