// Package number // 使用随机数时需要先 调用 rand.seed()函数 package number import ( "fmt" "golang.org/x/exp/constraints" "math" "math/rand" "strconv" ) func Range[T constraints.Integer](start, end, step T) []T { if step == 0 { panic("step can't be 0") } l := int((end-start+1)/step + 1) if l < 0 { l = 0 - l } r := make([]T, 0, l) for i := start; ; { r = append(r, i) i = i + step if (step > 0 && i > end) || (step < 0 && i < end) { break } } return r } // Rand 都为闭区间 [start,end] func Rand[T constraints.Integer](start, end T) T { end++ return T(rand.Int63n(int64(end-start))) + start } func Min[T constraints.Integer | constraints.Float](a ...T) T { min := a[0] for _, t := range a { if min > t { min = t } } return min } func Max[T constraints.Integer | constraints.Float](a ...T) T { max := a[0] for _, t := range a { if max < t { max = t } } return max } func Sum[T constraints.Integer | constraints.Float](a ...T) T { s := T(0) for _, t := range a { s += t } return s } func Add[T constraints.Integer | constraints.Float](i, j T) T { return i + j } func Sub[T constraints.Integer | constraints.Float](i, j T) T { return i - j } func ToString[T constraints.Integer | constraints.Float](n T) string { return fmt.Sprintf("%v", n) } func IntToString[T constraints.Integer](i T) string { return strconv.FormatInt(int64(i), 10) } func Abs[T constraints.Integer | constraints.Float](n T) T { if n >= 0 { return n } return -n } func Mul[T constraints.Integer | constraints.Float](i, j T) T { return i * j } func Divide[T constraints.Integer | constraints.Float](i, j T) T { return i / j } func CalTotalPage[T constraints.Integer](totalRows, size T) T { return T(math.Ceil(float64(totalRows) / float64(size))) } type Counter[T constraints.Integer] func() T func Counters[T constraints.Integer]() func() T { var count T return func() T { count++ return count } }