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34 lines
1.2 KiB
34 lines
1.2 KiB
// Copyright 2016 The Prometheus 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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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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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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package value |
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import ( |
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"math" |
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) |
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const ( |
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// NormalNaN is a quiet NaN. This is also math.NaN(). |
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NormalNaN uint64 = 0x7ff8000000000001 |
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// StaleNaN is a signaling NaN, due to the MSB of the mantissa being 0. |
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// This value is chosen with many leading 0s, so we have scope to store more |
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// complicated values in the future. It is 2 rather than 1 to make |
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// it easier to distinguish from the NormalNaN by a human when debugging. |
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StaleNaN uint64 = 0x7ff0000000000002 |
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) |
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// IsStaleNaN returns true when the provided NaN value is a stale marker. |
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func IsStaleNaN(v float64) bool { |
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return math.Float64bits(v) == StaleNaN |
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}
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