neo-go/pkg/wire/util/fixed8/fixed8.go

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2019-02-25 22:44:14 +00:00
package fixed8
import (
"errors"
"fmt"
"strconv"
)
const (
decimals = 100000000
)
var errInvalidString = errors.New("Fixed8 must satisfy following regex \\d+(\\.\\d{1,8})?")
// Fixed8 represents a fixed-point number with precision 10^-8.
type Fixed8 int64
// String implements the Stringer interface.
func (f Fixed8) String() string {
val := f.Value()
return strconv.FormatFloat(val, 'f', -1, 64)
}
// Value returns the original value representing the Fixed8.
func (f Fixed8) Value() float64 {
return float64(f) / float64(decimals)
}
func (f Fixed8) Add(val Fixed8) Fixed8 {
a := int64(f.Value())
b := int64(val.Value())
c := a + b
return FromInt(c)
}
func (f Fixed8) Sub(val Fixed8) Fixed8 {
a := int64(f.Value())
b := int64(val.Value())
c := a - b
return FromInt(c)
}
func FromInt(val int64) Fixed8 {
return Fixed8(val * decimals)
}
func FromFloat(val float64) Fixed8 {
return Fixed8(val * decimals)
}
func FromString(val string) (Fixed8, error) {
res, err := strconv.ParseFloat(val, 64)
if err != nil {
return 0, fmt.Errorf("Failed at parsing string %s", val)
}
return FromFloat(res), nil
}