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utils.go
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utils.go
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// Copyright © 2023 Cisco Systems, Inc. and its affiliates.
// All rights reserved.
//
// 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 types
import "fmt"
// CoalesceComparable will return original if target is not set, and target if
// original is not set. If both are set then they must be the same otherwise an
// error is raised.
func CoalesceComparable[T comparable](original, target T) (T, error) {
var zero T
if original != zero && target != zero && original != target {
return zero, fmt.Errorf("%v does not match %v", original, target)
}
if original != zero {
return original, nil
}
return target, nil
}
// UnionSlices returns the union of the input slices.
func UnionSlices[T comparable](inputs ...[]T) []T {
seen := map[T]struct{}{}
result := []T{}
for _, i := range inputs {
for _, j := range i {
if _, ok := seen[j]; !ok {
seen[j] = struct{}{}
result = append(result, j)
}
}
}
return result
}
// ValueOrZero returns the value that the pointer ptr pointers to. It returns
// the zero value if ptr is nil.
func ValueOrZero[T any](ptr *T) T {
var t T
if ptr != nil {
t = *ptr
}
return t
}
func PointerTo[T any](value T) *T {
return &value
}