mirror of https://github.com/prometheus/prometheus
35 lines
1.2 KiB
Go
35 lines
1.2 KiB
Go
// Copyright 2016 The Prometheus 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 value
|
|
|
|
import (
|
|
"math"
|
|
)
|
|
|
|
const (
|
|
// NormalNaN is a quiet NaN. This is also math.NaN().
|
|
NormalNaN uint64 = 0x7ff8000000000001
|
|
|
|
// StaleNaN is a signalling NaN, due to the MSB of the mantissa being 0.
|
|
// This value is chosen with many leading 0s, so we have scope to store more
|
|
// complicated values in the future. It is 2 rather than 1 to make
|
|
// it easier to distinguish from the NormalNaN by a human when debugging.
|
|
StaleNaN uint64 = 0x7ff0000000000002
|
|
)
|
|
|
|
// IsStaleNaN returns true when the provided NaN value is a stale marker.
|
|
func IsStaleNaN(v float64) bool {
|
|
return math.Float64bits(v) == StaleNaN
|
|
}
|