1 // Copyright 2018, OpenCensus Authors
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
7 // http://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
17 // LabelValue represents the value of a label.
18 // The zero value represents a missing label value, which may be treated
19 // differently to an empty string value by some back ends.
20 type LabelValue struct {
21 Value string // string value of the label
22 Present bool // flag that indicated whether a value is present or not
25 // NewLabelValue creates a new non-nil LabelValue that represents the given string.
26 func NewLabelValue(val string) LabelValue {
27 return LabelValue{Value: val, Present: true}