add helper function for converting basic type (knative#193)

* add helper function for converting basic type

Co-authored-by: fm <mingfu@alauda.cn>

pointer/pointer.go

@@ -0,0 +1,33 @@
+/*
+Copyright 2021 The Katanomi Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package pointer
+
+// Bool is a helper routine that allocates a new bool value
+// to store v and returns a pointer to it.
+func Bool(v bool) *bool { return &v }
+
+// Int is a helper routine that allocates a new int value
+// to store v and returns a pointer to it.
+func Int(v int) *int { return &v }
+
+// Int64 is a helper routine that allocates a new int64 value
+// to store v and returns a pointer to it.
+func Int64(v int64) *int64 { return &v }
+
+// String is a helper routine that allocates a new string value
+// to store v and returns a pointer to it.
+func String(v string) *string { return &v }

pointer/pointer_test.go

@@ -0,0 +1,47 @@
+/*
+Copyright 2021 The Katanomi Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package pointer
+
+import (
+	"testing"
+
+	. "github.com/onsi/gomega"
+)
+
+func TestBool(t *testing.T) {
+	g := NewGomegaWithT(t)
+	input := true
+	g.Expect(Bool(input)).To(Equal(&input))
+}
+
+func TestInt(t *testing.T) {
+	g := NewGomegaWithT(t)
+	input := int(0)
+	g.Expect(Int(input)).To(Equal(&input))
+}
+
+func TestInt64(t *testing.T) {
+	g := NewGomegaWithT(t)
+	input := int64(0)
+	g.Expect(Int64(input)).To(Equal(&input))
+}
+
+func TestString(t *testing.T) {
+	g := NewGomegaWithT(t)
+	input := ""
+	g.Expect(String(input)).To(Equal(&input))
+}