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// Copyright 2017 Google Inc. All Rights Reserved.
// This file is available under the Apache license.
package datum
import (
"encoding/json"
"fmt"
"math"
"sync/atomic"
"time"
)
// Float describes a floating point value at a given timestamp.
type Float struct {
BaseDatum
Valuebits uint64
}
// ValueString returns the value of the Float as a string.
func (d *Float) ValueString() string {
return fmt.Sprintf("%g", d.Get())
}
// Set sets value of the Float at the timestamp ts.
func (d *Float) Set(v float64, ts time.Time) {
atomic.StoreUint64(&d.Valuebits, math.Float64bits(v))
d.stamp(ts)
}
// Get returns the floating-point value.
func (d *Float) Get() float64 {
return math.Float64frombits(atomic.LoadUint64(&d.Valuebits))
}
// MarshalJSON returns a JSON encoding of the Float.
func (d *Float) MarshalJSON() ([]byte, error) {
j := struct {
Value float64
Time int64
}{d.Get(), atomic.LoadInt64(&d.Time)}
return json.Marshal(j)
}
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