72 lines
1.2 KiB
Go
72 lines
1.2 KiB
Go
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package math
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type signed interface {
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~int | ~int8 | ~int16 | ~int32 | ~int64
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}
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type unsigned interface {
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~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr
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}
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type integer interface {
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signed | unsigned
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}
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type float interface {
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~float32 | ~float64
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}
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type ordered interface {
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integer | float | ~string
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}
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func Abs[T signed](i T) T {
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if i > 0 {
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return i
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}
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return -i
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}
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func Max[T ordered](i T, candidates ...T) T {
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for _, j := range candidates {
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if i < j {
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i = j
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}
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}
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return i
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}
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func Min[T ordered](i T, candidates ...T) T {
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for _, j := range candidates {
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if i > j {
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i = j
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}
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}
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return i
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}
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func PagerBox(first, last uint64, pos, count int64) (uint64, int64) {
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var start uint64
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if pos >= 0 {
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if int64(first) > pos {
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start = first
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} else {
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start = uint64(pos) + 1
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}
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} else {
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start = uint64(int64(last) + pos + 1)
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}
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switch {
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case count > 0:
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count = Min(count, int64(last-start)+1)
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case pos >= 0 && count < 0:
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count = Max(count, int64(first-start))
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case pos < 0 && count < 0:
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count = Max(count, int64(first-start)-1)
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}
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if count == 0 || (start < first && count <= 0) || (start > last && count >= 0) {
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return 0, 0
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}
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return start, count
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}
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