implove iterator func

iter.go

@@ -4,18 +4,33 @@ package linq
 
 import "iter"
 
+// All returns an iterator function
 func (e Enumerable[T]) All() iter.Seq2[T, error] {
-	return iterAll(e())
-}
+	er := e()
+	return func(yield func(T, error) bool) {
+		for {
+			v, err := er.Next()
+			if err != nil {
+				if isEOC(err) {
+					return
+				}
+				yield(v, err)
+				return
+			}
 
-func (e OrderedEnumerable[T]) All() iter.Seq2[T, error] {
-	return iterAll(e())
+			if !yield(v, nil) {
+				return
+			}
+		}
+	}
 }
 
-func iterAll[T any, E Enumerator[T]](e E) iter.Seq2[T, error] {
+// All returns an iterator function
+func (e OrderedEnumerable[T]) All() iter.Seq2[T, error] {
+	er := e()
 	return func(yield func(T, error) bool) {
 		for {
-			v, err := e.Next()
+			v, err := er.Next()
 			if err != nil {
 				if isEOC(err) {
 					return

iter_bench_test.go

@@ -9,9 +9,7 @@ import (
 	"github.com/makiuchi-d/linq/v2"
 )
 
-var src = linq.Where(
-	linq.Range(0, 10000),
-	func(v int) (bool, error) { return v%2 == 0, nil })
+var src = linq.Range(0, 100000)
 
 func BenchmarkFor(b *testing.B) {
 	for i := 0; i < b.N; i++ {