56 lines
906 B
Go
56 lines
906 B
Go
package ranges
|
|
|
|
import (
|
|
"surdeus.su/core/gods/iters"
|
|
cnts "golang.org/x/exp/constraints"
|
|
)
|
|
|
|
|
|
type Range[V cnts.Ordered] struct {
|
|
start, step, end V
|
|
}
|
|
|
|
// Returns the new Range strucucture with corresponding start, step and end.
|
|
// If the values can never reach the end then the function will return nil.
|
|
func New[V cnts.Ordered](start, step, end V) *Range[V] {
|
|
return &Range[V]{
|
|
start, step, end,
|
|
}
|
|
}
|
|
|
|
func (r *Range[V]) Chan() iters.PairChan[int, V] {
|
|
|
|
less := func(a, b V) bool {
|
|
return a < b
|
|
}
|
|
more := func(a, b V) bool {
|
|
return a > b
|
|
}
|
|
|
|
var compare func(a, b V) bool
|
|
start, step, end := r.start, r.step, r.end
|
|
if start < end {
|
|
compare = less
|
|
} else {
|
|
compare = more
|
|
}
|
|
|
|
c := make(iters.PairChan[int, V])
|
|
go func(){
|
|
|
|
|
|
j := 0
|
|
for i := start ; compare(i, end) ; i += step {
|
|
c <- iters.Pair[int, V]{
|
|
K:j,
|
|
V:i,
|
|
}
|
|
j++
|
|
}
|
|
|
|
close(c)
|
|
}()
|
|
|
|
return c
|
|
}
|
|
|