[Bug libstdc++/120465] Incorrect value_type for std::flat_map

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120465

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2025-05-28
     Ever confirmed|0                           |1
   Target Milestone|---                         |15.2
                 CC|                            |ppalka at gcc dot gnu.org

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
--- a/libstdc++-v3/include/std/flat_map
+++ b/libstdc++-v3/include/std/flat_map
@@ -895,7 +895,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        {
          auto __guard = _M_make_clear_guard();
          auto __zv = views::zip(_M_cont.keys, _M_cont.values);
-         auto __sr = ranges::remove_if(__zv, __pred);
+         auto __sr = ranges::remove_if(__zv, __pred,
+                                       [](const auto& e) {
+                                         return const_reference(e);
+                                       });
          auto __erased = __sr.size();
          erase(end() - __erased, end());
          __guard._M_disable();