diff --git a/include/boost/unordered/concurrent_flat_map.hpp b/include/boost/unordered/concurrent_flat_map.hpp
index 3f2bb793..3679df58 100644
--- a/include/boost/unordered/concurrent_flat_map.hpp
+++ b/include/boost/unordered/concurrent_flat_map.hpp
@@ -766,6 +766,25 @@ namespace boost {
 
       hasher hash_function() const { return table_.hash_function(); }
       key_equal key_eq() const { return table_.key_eq(); }
+
+      /// Equality
+      ///
+      
+      template <class Key, class Hash, class KeyEqual, class Allocator>
+      friend bool operator==(
+        concurrent_flat_map<Key, Hash, KeyEqual, Allocator> const& lhs,
+        concurrent_flat_map<Key, Hash, KeyEqual, Allocator> const& rhs)
+      {
+        return lhs.table_ == rhs.table_;
+      }
+
+      template <class Key, class Hash, class KeyEqual, class Allocator>
+      friend bool operator!=(
+        concurrent_flat_map<Key, Hash, KeyEqual, Allocator> const& lhs,
+        concurrent_flat_map<Key, Hash, KeyEqual, Allocator> const& rhs)
+      {
+        return !(lhs == rhs);
+      }
     };
   } // namespace unordered
 } // namespace boost
diff --git a/include/boost/unordered/detail/foa/concurrent_table.hpp b/include/boost/unordered/detail/foa/concurrent_table.hpp
index 7eee515e..1b9ade9c 100644
--- a/include/boost/unordered/detail/foa/concurrent_table.hpp
+++ b/include/boost/unordered/detail/foa/concurrent_table.hpp
@@ -697,13 +697,13 @@ public:
     boost::ignore_unused<super2>();
 
     auto      lck=exclusive_access(*this,x);
-    size_type s=unprotected_size();
+    size_type s=super::size();
     x.super2::for_all_elements( /* super2::for_all_elements -> unprotected */
       [&,this](group_type* pg,unsigned int n,element_type* p){
         typename merge_table_type::erase_on_exit e{x,pg,n,p};
         if(!unprotected_emplace(type_policy::move(*p)))e.rollback();
       });
-    return size_type{unprotected_size()-s};
+    return size_type{super::size()-s};
   }
 
   template<typename Hash2,typename Pred2>
@@ -773,6 +773,17 @@ public:
     return x.erase_if(std::forward<Predicate>(pr));
   }
 
+  friend bool operator==(const concurrent_table& x,const concurrent_table& y)
+  {
+    auto lck=exclusive_access(x,y);
+    return static_cast<const super&>(x)==static_cast<const super&>(y);
+  }
+
+  friend bool operator!=(const concurrent_table& x,const concurrent_table& y)
+  {
+    return !(x==y);
+  }
+
 private:
   using mutex_type=cacheline_protected<rw_spinlock>;
   using multimutex_type=multimutex<mutex_type,128>; // TODO: adapt 128 to the machine
@@ -806,14 +817,14 @@ private:
     return exclusive_lock_guard{mutexes};
   }
 
-  inline exclusive_bilock_guard exclusive_access(
+  static inline exclusive_bilock_guard exclusive_access(
     const concurrent_table& x,const concurrent_table& y)
   {
     return {x.mutexes,y.mutexes};
   }
 
   template<typename Hash2,typename Pred2>
-  inline exclusive_bilock_guard exclusive_access(
+  static inline exclusive_bilock_guard exclusive_access(
     const concurrent_table& x,
     const concurrent_table<TypePolicy,Hash2,Pred2,Allocator>& y)
   {
@@ -1079,9 +1090,7 @@ private:
     auto        hash=this->hash_for(k);
     auto        pos0=this->position_for(hash);
 
-    // TODO: could be made more efficient (nonconcurrent scenario)
-    if(unprotected_visit(
-      group_shared{},k,pos0,hash,[](const value_type&){}))return false;
+    if(!this->find(k,pos0,hash))return false;
 
     if(BOOST_LIKELY(this->size_<this->ml)){
       this->unchecked_emplace_at(pos0,hash,std::forward<Args>(args)...);
diff --git a/include/boost/unordered/detail/foa/core.hpp b/include/boost/unordered/detail/foa/core.hpp
index 7e47568f..295f580f 100644
--- a/include/boost/unordered/detail/foa/core.hpp
+++ b/include/boost/unordered/detail/foa/core.hpp
@@ -1097,9 +1097,14 @@ static constexpr float mlf=0.875f;
 template<typename Group,typename Element>
 struct table_locator
 {
-  Group        *pg;
-  unsigned int  n;
-  Element      *p;
+  table_locator()=default;
+  table_locator(Group* pg_,unsigned int n_,Element* p_):pg{pg_},n{n_},p{p_}{}
+
+  explicit operator bool()const noexcept{return p!=nullptr;}
+
+  Group        *pg=nullptr;
+  unsigned int  n=0;
+  Element      *p=nullptr;
 };
 
 struct try_emplace_args_t{};
@@ -1425,6 +1430,52 @@ public:
     recover_slot(pc);
   }
 
+  template<typename Key>
+  BOOST_FORCEINLINE locator find(const Key& x)const
+  {
+    auto hash=hash_for(x);
+    return find(x,position_for(hash),hash);
+  }
+
+#if defined(BOOST_MSVC)
+/* warning: forcing value to bool 'true' or 'false' in bool(pred()...) */
+#pragma warning(push)
+#pragma warning(disable:4800)
+#endif
+
+  template<typename Key>
+  BOOST_FORCEINLINE locator find(
+    const Key& x,std::size_t pos0,std::size_t hash)const
+  {    
+    prober pb(pos0);
+    do{
+      auto pos=pb.get();
+      auto pg=arrays.groups+pos;
+      auto mask=pg->match(hash);
+      if(mask){
+        BOOST_UNORDERED_ASSUME(arrays.elements!=nullptr);
+        auto p=arrays.elements+pos*N;
+        prefetch_elements(p);
+        do{
+          auto n=unchecked_countr_zero(mask);
+          if(BOOST_LIKELY(bool(pred()(x,key_from(p[n]))))){
+            return {pg,n,p+n};
+          }
+          mask&=mask-1;
+        }while(mask);
+      }
+      if(BOOST_LIKELY(pg->is_not_overflowed(hash))){
+        return {};
+      }
+    }
+    while(BOOST_LIKELY(pb.next(arrays.groups_size_mask)));
+    return {};
+  }
+
+#if defined(BOOST_MSVC)
+#pragma warning(pop) /* C4800 */
+#endif
+
   void swap(table_core& x)
     noexcept(
       alloc_traits::propagate_on_container_swap::value||
@@ -1503,6 +1554,23 @@ public:
     rehash(std::size_t(std::ceil(float(n)/mlf)));
   }
 
+  friend bool operator==(const table_core& x,const table_core& y)
+  {
+    return
+      x.size()==y.size()&&
+      x.for_all_elements_while([&](element_type* p){
+        auto loc=y.find(key_from(*p));
+        return loc&&
+          const_cast<const value_type&>(type_policy::value_from(*p))==
+          const_cast<const value_type&>(type_policy::value_from(*loc.p));
+      });
+  }
+
+  friend bool operator!=(const table_core& x,const table_core& y)
+  {
+    return !(x==y);
+  }
+
   struct clear_on_exit
   {
     ~clear_on_exit(){x.clear();}
@@ -1683,34 +1751,36 @@ public:
   }
 
   template<typename F>
-  void for_all_elements_while(F f)const
+  bool for_all_elements_while(F f)const
   {
-    for_all_elements_while(arrays,f);
+    return for_all_elements_while(arrays,f);
   }
 
   template<typename F>
   static auto for_all_elements_while(const arrays_type& arrays_,F f)
-    ->decltype(f(nullptr),void())
+    ->decltype(f(nullptr),bool())
   {
-    for_all_elements_while(
+    return for_all_elements_while(
       arrays_,[&](group_type*,unsigned int,element_type* p){return f(p);});
   }
 
   template<typename F>
   static auto for_all_elements_while(const arrays_type& arrays_,F f)
-    ->decltype(f(nullptr,0,nullptr),void())
+    ->decltype(f(nullptr,0,nullptr),bool())
   {
     auto p=arrays_.elements;
-    if(!p){return;}
-    for(auto pg=arrays_.groups,last=pg+arrays_.groups_size_mask+1;
-        pg!=last;++pg,p+=N){
-      auto mask=match_really_occupied(pg,last);
-      while(mask){
-        auto n=unchecked_countr_zero(mask);
-        if(!f(pg,n,p+n))return;
-        mask&=mask-1;
+    if(p){
+      for(auto pg=arrays_.groups,last=pg+arrays_.groups_size_mask+1;
+          pg!=last;++pg,p+=N){
+        auto mask=match_really_occupied(pg,last);
+        while(mask){
+          auto n=unchecked_countr_zero(mask);
+          if(!f(pg,n,p+n))return false;
+          mask&=mask-1;
+        }
       }
     }
+    return true;
   }
 
   arrays_type    arrays;
diff --git a/include/boost/unordered/detail/foa/table.hpp b/include/boost/unordered/detail/foa/table.hpp
index 1946bd9f..554e762a 100644
--- a/include/boost/unordered/detail/foa/table.hpp
+++ b/include/boost/unordered/detail/foa/table.hpp
@@ -404,8 +404,7 @@ public:
   template<typename Key>
   BOOST_FORCEINLINE iterator find(const Key& x)
   {
-    auto hash=this->hash_for(x);
-    return find_impl(x,this->position_for(hash),hash);
+    return make_iterator(super::find(x));
   }
 
   template<typename Key>
@@ -440,6 +439,13 @@ public:
     return std::size_t(s-x.size());
   }
 
+  friend bool operator==(const table& x,const table& y)
+  {
+    return static_cast<const super&>(x)==static_cast<const super&>(y);
+  }
+
+  friend bool operator!=(const table& x,const table& y){return !(x==y);}
+
 private:
   struct erase_on_exit
   {
@@ -458,55 +464,16 @@ private:
     return {l.pg,l.n,l.p};
   }
 
-#if defined(BOOST_MSVC)
-/* warning: forcing value to bool 'true' or 'false' in bool(pred()...) */
-#pragma warning(push)
-#pragma warning(disable:4800)
-#endif
-
-  template<typename Key>
-  BOOST_FORCEINLINE iterator find_impl(
-    const Key& x,std::size_t pos0,std::size_t hash)const
-  {    
-    prober pb(pos0);
-    do{
-      auto pos=pb.get();
-      auto pg=this->arrays.groups+pos;
-      auto mask=pg->match(hash);
-      if(mask){
-        BOOST_UNORDERED_ASSUME(this->arrays.elements!=nullptr);
-        auto p=this->arrays.elements+pos*N;
-        this->prefetch_elements(p);
-        do{
-          auto n=unchecked_countr_zero(mask);
-          if(BOOST_LIKELY(bool(this->pred()(x,this->key_from(p[n]))))){
-            return {pg,n,p+n};
-          }
-          mask&=mask-1;
-        }while(mask);
-      }
-      if(BOOST_LIKELY(pg->is_not_overflowed(hash))){
-        return {}; /* end() */
-      }
-    }
-    while(BOOST_LIKELY(pb.next(this->arrays.groups_size_mask)));
-    return {}; /* end() */
-  }
-
-#if defined(BOOST_MSVC)
-#pragma warning(pop) /* C4800 */
-#endif
-
   template<typename... Args>
   BOOST_FORCEINLINE std::pair<iterator,bool> emplace_impl(Args&&... args)
   {
     const auto &k=this->key_from(std::forward<Args>(args)...);
     auto        hash=this->hash_for(k);
     auto        pos0=this->position_for(hash);
-    auto        it=find_impl(k,pos0,hash);
+    auto        loc=super::find(k,pos0,hash);
 
-    if(it!=end()){
-      return {it,false};
+    if(loc){
+      return {make_iterator(loc),false};
     }
     if(BOOST_LIKELY(this->size_<this->ml)){
       return {
diff --git a/include/boost/unordered/unordered_flat_map.hpp b/include/boost/unordered/unordered_flat_map.hpp
index a7b6482b..8a844dd3 100644
--- a/include/boost/unordered/unordered_flat_map.hpp
+++ b/include/boost/unordered/unordered_flat_map.hpp
@@ -695,35 +695,26 @@ namespace boost {
       hasher hash_function() const { return table_.hash_function(); }
 
       key_equal key_eq() const { return table_.key_eq(); }
-    };
 
-    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
-    bool operator==(
-      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
-      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
-    {
-      if (&lhs == &rhs) {
-        return true;
+      /// Equality
+      ///
+      
+      template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+      friend bool operator==(
+        unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+        unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
+      {
+        return lhs.table_ == rhs.table_;
       }
 
-      return (lhs.size() == rhs.size()) && ([&] {
-        for (auto const& kvp : lhs) {
-          auto pos = rhs.find(kvp.first);
-          if ((pos == rhs.end()) || (*pos != kvp)) {
-            return false;
-          }
-        }
-        return true;
-      })();
-    }
-
-    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
-    bool operator!=(
-      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
-      unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
-    {
-      return !(lhs == rhs);
-    }
+      template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+      friend bool operator!=(
+        unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+        unordered_flat_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
+      {
+        return !(lhs == rhs);
+      }
+    };
 
     template <class Key, class T, class Hash, class KeyEqual, class Allocator>
     void swap(unordered_flat_map<Key, T, Hash, KeyEqual, Allocator>& lhs,
diff --git a/include/boost/unordered/unordered_flat_set.hpp b/include/boost/unordered/unordered_flat_set.hpp
index 4562b1e5..b9ded1ff 100644
--- a/include/boost/unordered/unordered_flat_set.hpp
+++ b/include/boost/unordered/unordered_flat_set.hpp
@@ -492,35 +492,26 @@ namespace boost {
       hasher hash_function() const { return table_.hash_function(); }
 
       key_equal key_eq() const { return table_.key_eq(); }
-    };
 
-    template <class Key, class Hash, class KeyEqual, class Allocator>
-    bool operator==(
-      unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& lhs,
-      unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& rhs)
-    {
-      if (&lhs == &rhs) {
-        return true;
+      /// Equality
+      ///
+      
+      template <class Key, class Hash, class KeyEqual, class Allocator>
+      friend bool operator==(
+        unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+        unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& rhs)
+      {
+        return lhs.table_ == rhs.table_;
       }
 
-      return (lhs.size() == rhs.size()) && ([&] {
-        for (auto const& key : lhs) {
-          auto pos = rhs.find(key);
-          if ((pos == rhs.end()) || (key != *pos)) {
-            return false;
-          }
-        }
-        return true;
-      })();
-    }
-
-    template <class Key, class Hash, class KeyEqual, class Allocator>
-    bool operator!=(
-      unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& lhs,
-      unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& rhs)
-    {
-      return !(lhs == rhs);
-    }
+      template <class Key, class Hash, class KeyEqual, class Allocator>
+      friend bool operator!=(
+        unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+        unordered_flat_set<Key, Hash, KeyEqual, Allocator> const& rhs)
+      {
+        return !(lhs == rhs);
+      }
+    };
 
     template <class Key, class Hash, class KeyEqual, class Allocator>
     void swap(unordered_flat_set<Key, Hash, KeyEqual, Allocator>& lhs,
diff --git a/include/boost/unordered/unordered_node_map.hpp b/include/boost/unordered/unordered_node_map.hpp
index 6c598354..513eab95 100644
--- a/include/boost/unordered/unordered_node_map.hpp
+++ b/include/boost/unordered/unordered_node_map.hpp
@@ -847,35 +847,26 @@ namespace boost {
       hasher hash_function() const { return table_.hash_function(); }
 
       key_equal key_eq() const { return table_.key_eq(); }
-    };
 
-    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
-    bool operator==(
-      unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
-      unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
-    {
-      if (&lhs == &rhs) {
-        return true;
+      /// Equality
+      ///
+      
+      template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+      friend bool operator==(
+        unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+        unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
+      {
+        return lhs.table_ == rhs.table_;
       }
 
-      return (lhs.size() == rhs.size()) && ([&] {
-        for (auto const& kvp : lhs) {
-          auto pos = rhs.find(kvp.first);
-          if ((pos == rhs.end()) || (*pos != kvp)) {
-            return false;
-          }
-        }
-        return true;
-      })();
-    }
-
-    template <class Key, class T, class Hash, class KeyEqual, class Allocator>
-    bool operator!=(
-      unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
-      unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
-    {
-      return !(lhs == rhs);
-    }
+      template <class Key, class T, class Hash, class KeyEqual, class Allocator>
+      friend bool operator!=(
+        unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& lhs,
+        unordered_node_map<Key, T, Hash, KeyEqual, Allocator> const& rhs)
+      {
+        return !(lhs == rhs);
+      }
+    };
 
     template <class Key, class T, class Hash, class KeyEqual, class Allocator>
     void swap(unordered_node_map<Key, T, Hash, KeyEqual, Allocator>& lhs,
diff --git a/include/boost/unordered/unordered_node_set.hpp b/include/boost/unordered/unordered_node_set.hpp
index 2e2a9dd4..3758802e 100644
--- a/include/boost/unordered/unordered_node_set.hpp
+++ b/include/boost/unordered/unordered_node_set.hpp
@@ -631,35 +631,26 @@ namespace boost {
       hasher hash_function() const { return table_.hash_function(); }
 
       key_equal key_eq() const { return table_.key_eq(); }
-    };
 
-    template <class Key, class Hash, class KeyEqual, class Allocator>
-    bool operator==(
-      unordered_node_set<Key, Hash, KeyEqual, Allocator> const& lhs,
-      unordered_node_set<Key, Hash, KeyEqual, Allocator> const& rhs)
-    {
-      if (&lhs == &rhs) {
-        return true;
+      /// Equality
+      ///
+
+      template <class Key, class Hash, class KeyEqual, class Allocator>
+      friend bool operator==(
+        unordered_node_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+        unordered_node_set<Key, Hash, KeyEqual, Allocator> const& rhs)
+      {
+        return lhs.table_ == rhs.table_;
       }
 
-      return (lhs.size() == rhs.size()) && ([&] {
-        for (auto const& key : lhs) {
-          auto pos = rhs.find(key);
-          if ((pos == rhs.end()) || (key != *pos)) {
-            return false;
-          }
-        }
-        return true;
-      })();
-    }
-
-    template <class Key, class Hash, class KeyEqual, class Allocator>
-    bool operator!=(
-      unordered_node_set<Key, Hash, KeyEqual, Allocator> const& lhs,
-      unordered_node_set<Key, Hash, KeyEqual, Allocator> const& rhs)
-    {
-      return !(lhs == rhs);
-    }
+      template <class Key, class Hash, class KeyEqual, class Allocator>
+      friend bool operator!=(
+        unordered_node_set<Key, Hash, KeyEqual, Allocator> const& lhs,
+        unordered_node_set<Key, Hash, KeyEqual, Allocator> const& rhs)
+      {
+        return !(lhs == rhs);
+      }
+    };
 
     template <class Key, class Hash, class KeyEqual, class Allocator>
     void swap(unordered_node_set<Key, Hash, KeyEqual, Allocator>& lhs,