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