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53 lines
979 B
53 lines
979 B
package typeutil
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import (
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"time"
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"golang.org/x/exp/constraints"
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)
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// Keys returns a slice of the keys of the map. based with go 1.18 generics
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func Keys[K comparable, V any](m map[K]V) []K {
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r := make([]K, 0, len(m))
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for k := range m {
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r = append(r, k)
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}
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return r
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}
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func IntToBool[T constraints.Signed](a T) bool {
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switch a {
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case 0, -1:
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return false
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}
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return true
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}
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func Reverse[T any](s []T) []T {
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h := make([]T, len(s))
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for i := 0; i < len(s); i++ {
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h[i] = s[len(s)-i-1]
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}
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return h
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}
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func TimeStamp(stamp int64) time.Time {
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s := time.Unix(stamp, 0)
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if s.Local().Year() > 9999 {
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return time.Date(9999, 12, 13, 23, 59, 59, 0, time.Local)
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}
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return s
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}
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func TimeEpoch(epoch int64) time.Time {
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maxTime := int64(99633311740000000)
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if epoch > maxTime {
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return time.Date(2049, 1, 1, 1, 1, 1, 1, time.Local)
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}
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t := time.Date(1601, 1, 1, 0, 0, 0, 0, time.Local)
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d := time.Duration(epoch)
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for i := 0; i < 1000; i++ {
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t = t.Add(d)
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}
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return t
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}
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