add convenience methods for creating new maps, sets, and counters

crdt.go

@@ -301,6 +301,21 @@ func (m *CrdtMap) Commit() (*rpb.DtUpdateResp, error) {
 	return res, err
 }
 
+// Returns a new CRDT map
+func (m *CrdtMap) NewMap() *CrdtMap {
+	return m.crdt.NewMap()
+}
+
+// Returns a new CRDT set
+func (m *CrdtMap) NewSet() *CrdtSet {
+	return m.crdt.NewSet()
+}
+
+// Returns a new CRDT counter
+func (m *CrdtMap) NewCounter() *CrdtCounter {
+	return m.crdt.NewCounter()
+}
+
 // Crdt can manually take raw opts via Do() and execute Fetch() or Update(),
 // however, it is preferred to call the Counter(), Set(), or Map() methods
 // and work with each object through those interfaces.

crdt_test.go

@@ -307,3 +307,29 @@ func TestCrdtMap(t *testing.T) {
 		t.Fatal(err.Error())
 	}
 }
+
+func TestMapMethods(t *testing.T) {
+	crdt := &Crdt{}
+	mp := &CrdtMap{crdt: crdt}
+
+	mp1 := crdt.NewMap()
+	mp2 := mp.NewMap()
+	if mp1.crdt != mp2.crdt {
+		t.Error("CrdtMap.NewMap() did not attach to the correct CRDT struct")
+	}
+
+	st1 := crdt.NewSet()
+	st2 := mp.NewSet()
+
+	if st1.crdt != st2.crdt {
+		t.Error("CrdtMap.NewSet() did not attach to the correct CRDT struct")
+	}
+
+	ct1 := crdt.NewCounter()
+	ct2 := mp.NewCounter()
+
+	if ct1.crdt != ct2.crdt {
+		t.Error("CrdtMap.NewCounter() did not attach to the correct CRDT struct")
+	}
+
+}