changes to using static opertaor()

Author: cjdb

libcxx/include/__algorithm/fold.h

@@ -63,8 +63,8 @@ concept __indirectly_binary_left_foldable =
 
 struct __fold_left_with_iter {
   template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Tp, __indirectly_binary_left_foldable<_Tp, _Ip> _Fp>
-  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr auto
-  operator()(_Ip __first, _Sp __last, _Tp __init, _Fp __f) const {
+  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI static constexpr auto
+  operator()(_Ip __first, _Sp __last, _Tp __init, _Fp __f) {
     using _Up = decay_t<invoke_result_t<_Fp&, _Tp, iter_reference_t<_Ip>>>;
 
     if (__first == __last) {
@@ -80,8 +80,8 @@ struct __fold_left_with_iter {
   }
 
   template <input_range _Rp, class _Tp, __indirectly_binary_left_foldable<_Tp, iterator_t<_Rp>> _Fp>
-  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Rp&& __r, _Tp __init, _Fp __f) const {
-    auto __result = (*this)(ranges::begin(__r), ranges::end(__r), std::move(__init), std::ref(__f));
+  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI static constexpr auto operator()(_Rp&& __r, _Tp __init, _Fp __f) {
+    auto __result = operator()(ranges::begin(__r), ranges::end(__r), std::move(__init), std::ref(__f));
 
     using _Up = decay_t<invoke_result_t<_Fp&, _Tp, range_reference_t<_Rp>>>;
     return fold_left_with_iter_result<borrowed_iterator_t<_Rp>, _Up>{
@@ -95,13 +95,13 @@ inline constexpr auto fold_left_with_iter = __fold_left_with_iter();
 
 struct __fold_left {
   template <input_iterator _Ip, sentinel_for<_Ip> _Sp, class _Tp, __indirectly_binary_left_foldable<_Tp, _Ip> _Fp>
-  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr auto
-  operator()(_Ip __first, _Sp __last, _Tp __init, _Fp __f) const {
+  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI static constexpr auto
+  operator()(_Ip __first, _Sp __last, _Tp __init, _Fp __f) {
     return fold_left_with_iter(std::move(__first), std::move(__last), std::move(__init), std::ref(__f)).result;
   }
 
   template <input_range _Rp, class _Tp, __indirectly_binary_left_foldable<_Tp, iterator_t<_Rp>> _Fp>
-  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Rp&& __r, _Tp __init, _Fp __f) const {
+  _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI static constexpr auto operator()(_Rp&& __r, _Tp __init, _Fp __f) {
     return fold_left_with_iter(ranges::begin(__r), ranges::end(__r), std::move(__init), std::ref(__f)).result;
   }
 };

libcxx/modules/std/algorithm.inc

@@ -16,7 +16,7 @@ export namespace std {
     using std::ranges::in_in_result;
     using std::ranges::in_out_out_result;
     using std::ranges::in_out_result;
-    // using std::ranges::in_value_result;
+    using std::ranges::in_value_result;
     using std::ranges::min_max_result;
     // using std::ranges::out_value_result;
   } // namespace ranges
@@ -48,6 +48,12 @@ export namespace std {
   } // namespace ranges
 #endif
 
+  // [alg.fold], fold
+  namespace ranges {
+    using std::ranges::fold_left;
+    using std::ranges::fold_left_with_iter;
+  } // namespace ranges
+
   // [alg.foreach], for each
   using std::for_each;