Merge pull request #236 from nmvalera/master

Add cast methods ToUintSlice

Author: sagikazarmark

cast.go

@@ -169,6 +169,12 @@ func ToIntSlice(i interface{}) []int {
 	return v
 }
 
+// ToUintSlice casts an interface to a []uint type.
+func ToUintSlice(i interface{}) []uint {
+	v, _ := ToUintSliceE(i)
+	return v
+}
+
 // ToFloat64Slice casts an interface to a []float64 type.
 func ToFloat64Slice(i interface{}) []float64 {
 	v, _ := ToFloat64SliceE(i)

cast_test.go

@@ -693,6 +693,9 @@ func TestToFloat64SliceE(t *testing.T) {
 		{[]string{"1.2", "3.2"}, []float64{1.2, 3.2}, false},
 		{[2]string{"2", "3"}, []float64{2, 3}, false},
 		{[2]string{"1.2", "3.2"}, []float64{1.2, 3.2}, false},
+		{[]int32{1, 3}, []float64{1.0, 3.0}, false},
+		{[]int64{1, 3}, []float64{1.0, 3.0}, false},
+		{[]bool{true, false}, []float64{1.0, 0.0}, false},
 		// errors
 		{nil, nil, true},
 		{testing.T{}, nil, true},
@@ -717,6 +720,47 @@ func TestToFloat64SliceE(t *testing.T) {
 	}
 }
 
+func TestToUintSliceE(t *testing.T) {
+	c := qt.New(t)
+
+	tests := []struct {
+		input  interface{}
+		expect []uint
+		iserr  bool
+	}{
+		{[]uint{1, 3}, []uint{1, 3}, false},
+		{[]interface{}{1, 3}, []uint{1, 3}, false},
+		{[]string{"2", "3"}, []uint{2, 3}, false},
+		{[]int{1, 3}, []uint{1, 3}, false},
+		{[]int32{1, 3}, []uint{1, 3}, false},
+		{[]int64{1, 3}, []uint{1, 3}, false},
+		{[]float32{1.0, 3.0}, []uint{1, 3}, false},
+		{[]float64{1.0, 3.0}, []uint{1, 3}, false},
+		{[]bool{true, false}, []uint{1, 0}, false},
+		// errors
+		{nil, nil, true},
+		{testing.T{}, nil, true},
+		{[]string{"foo", "bar"}, nil, true},
+	}
+
+	for i, test := range tests {
+		errmsg := qt.Commentf("i = %d", i) // assert helper message
+
+		v, err := ToUintSliceE(test.input)
+		if test.iserr {
+			c.Assert(err, qt.IsNotNil)
+			continue
+		}
+
+		c.Assert(err, qt.IsNil)
+		c.Assert(v, qt.DeepEquals, test.expect, errmsg)
+
+		// Non-E test
+		v = ToUintSlice(test.input)
+		c.Assert(v, qt.DeepEquals, test.expect, errmsg)
+	}
+}
+
 func TestToSliceE(t *testing.T) {
 	c := qt.New(t)
 

caste.go

@@ -615,9 +615,6 @@ func ToUint64E(i interface{}) (uint64, error) {
 	case string:
 		v, err := strconv.ParseUint(trimZeroDecimal(s), 0, 0)
 		if err == nil {
-			if v < 0 {
-				return 0, errNegativeNotAllowed
-			}
 			return v, nil
 		}
 		return 0, fmt.Errorf("unable to cast %#v of type %T to uint64", i, i)
@@ -1329,6 +1326,11 @@ func ToIntSliceE(i interface{}) ([]int, error) {
 	return toSliceE(i, ToIntE)
 }
 
+// ToUintSliceE casts an interface to a []uint type.
+func ToUintSliceE(i interface{}) ([]uint, error) {
+	return toSliceE(i, ToUintE)
+}
+
 // ToFloat64SliceE casts an interface to a []float64 type.
 func ToFloat64SliceE(i interface{}) ([]float64, error) {
 	return toSliceE(i, ToFloat64E)