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42.go
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42.go
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package main
import . "fmt"
type Enumerable interface {
Range(interface{}) interface{}
}
type List struct { int; *List }
func main() {
Range([]int{0, 2, 4, 6, 8}, print_cell)
Range([]int{0, 2, 4, 6, 8}, func(i, v interface{}) {
Printf("%v: %v\n", i, v)
})
Range(NewList(0, 2, 4, 6, 8), print_cell)
s := Range(NewList(0, 2, 4, 6, 8), make([]int, 0, 5))
Range(s, print_cell)
}
func print_cell(i, v int) {
Printf("%v: %v\n", i, v)
}
func NewList(s ...int) (r *List) {
for i := len(s) - 1; i > -1; i-- {
r = &List{ s[i], r }
}
return
}
func (l *List) Range(f interface{}) (r interface{}) {
switch f := f.(type) {
case func(int, int):
for i := 0; l != nil; l = l.List {
f(i, l.int)
i++
}
case []int:
for i := 0; l != nil && i < cap(f); l = l.List {
if len(f) - 1 < i {
f = append(f, l.int)
} else {
(f)[i] = l.int
}
i++
}
r = f
}
return
}
func Range(s, f interface{}) (r interface {}) {
switch s := s.(type) {
case Enumerable:
r = s.Range(f)
case []int:
switch f := f.(type) {
case func(int, int):
for i, v := range s {
f(i, v)
}
case func(interface{}, interface{}):
for i, v := range s {
f(i, v)
}
}
}
return
}