mirror of
https://github.com/prometheus/prometheus.git
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40 lines
1.2 KiB
Go
40 lines
1.2 KiB
Go
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/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package conversion
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import (
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"fmt"
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"reflect"
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)
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// EnforcePtr ensures that obj is a pointer of some sort. Returns a reflect.Value
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// of the dereferenced pointer, ensuring that it is settable/addressable.
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// Returns an error if this is not possible.
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func EnforcePtr(obj interface{}) (reflect.Value, error) {
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v := reflect.ValueOf(obj)
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if v.Kind() != reflect.Ptr {
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if v.Kind() == reflect.Invalid {
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return reflect.Value{}, fmt.Errorf("expected pointer, but got invalid kind")
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}
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return reflect.Value{}, fmt.Errorf("expected pointer, but got %v type", v.Type())
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}
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if v.IsNil() {
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return reflect.Value{}, fmt.Errorf("expected pointer, but got nil")
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}
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return v.Elem(), nil
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}
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