create receiver and bind fields

field.go

@@ -445,16 +445,7 @@ func groupFields(f []Field) [][]Field {
 	return groups
 }
 
-func bindFieldsReflect(structure any, values []Field) []Field {
-	receiver := reflect.ValueOf(structure)
-	if hasCircularReference(receiver) {
-		return values
-	}
-
-	if !acceptsFields(receiver.Type()) {
-		return values
-	}
-
+func bindFields(receiver reflect.Value, values []Field) []Field {
 	unmatched, try := filterFields(fieldHasCircRef, values)
 	groups := groupFields(try)
 	for _, g := range groups {
@@ -465,3 +456,42 @@ func bindFieldsReflect(structure any, values []Field) []Field {
 
 	return unmatched
 }
+
+func bindFieldsReflect(structure any, values []Field) []Field {
+	receiver := reflect.ValueOf(structure)
+	if hasCircularReference(receiver) {
+		return values
+	}
+
+	if !acceptsFields(receiver.Type()) {
+		return values
+	}
+
+	return bindFields(receiver, values)
+}
+
+func bindFieldsCreateReflect[T any](values []Field) (T, []Field) {
+	t := reflect.TypeFor[T]()
+	if hasCircularType(t) {
+		var r T
+		return r, values
+	}
+
+	if !acceptsFields(t) {
+		var r T
+		return r, values
+	}
+
+	receiver, ok := allocate(t, 1)
+	if !ok {
+		var r T
+		return r, values
+	}
+
+	unmatched := bindFields(receiver, values)
+	if len(unmatched) == len(values) {
+		receiver = reflect.Zero(t)
+	}
+
+	return receiver.Interface().(T), unmatched
+}

field_test.go

@@ -701,4 +701,40 @@ func TestField(t *testing.T) {
 			}
 		})
 	})
+
+	t.Run("bind fields create", func(t *testing.T) {
+		t.Run("circular type", func(t *testing.T) {
+			type s struct {
+				Foo int
+				Bar *s
+			}
+			_, u := bind.BindFieldsCreate[s](bind.NamedValue("foo", 42))
+			if len(u) != 1 {
+				t.Fatal()
+			}
+		})
+
+		t.Run("type does not accept fields", func(t *testing.T) {
+			_, u := bind.BindFieldsCreate[[]int](bind.NamedValue("foo", 42))
+			if len(u) != 1 {
+				t.Fatal()
+			}
+		})
+
+		t.Run("zero value when no fields were bound", func(t *testing.T) {
+			type s struct{ Foo int }
+			v, u := bind.BindFieldsCreate[*s](bind.NamedValue("bar", 42))
+			if len(u) != 1 || v != nil {
+				t.Fatal()
+			}
+		})
+
+		t.Run("create receiver", func(t *testing.T) {
+			type s struct{ Foo int }
+			v, u := bind.BindFieldsCreate[*s](bind.NamedValue("foo", 42))
+			if len(u) != 0 || v == nil || v.Foo != 42 {
+				t.Fatal()
+			}
+		})
+	})
 }

lib.go

@@ -65,8 +65,7 @@ func BindFields(structure any, values ...Field) []Field {
 }
 
 func BindFieldsCreate[T any](values ...Field) (T, []Field) {
-	var t T
-	return t, nil
+	return bindFieldsCreateReflect[T](values)
 }
 
 func AcceptsScalar[T any]() bool {