diff --git a/include/bitsery/details/serialization_common.h b/include/bitsery/details/serialization_common.h
index 6d5a441..462cee2 100644
--- a/include/bitsery/details/serialization_common.h
+++ b/include/bitsery/details/serialization_common.h
@@ -380,7 +380,7 @@ namespace bitsery {
             template <typename ... TArgs>
             explicit AdapterAndContextRef(Context& ctx, TArgs&& ... args)
                 : _adapter{std::forward<TArgs>(args)...},
-                  _context{ctx}
+                  _context(ctx)
             {
             }
 
diff --git a/include/bitsery/ext/inheritance.h b/include/bitsery/ext/inheritance.h
index f4c6655..5cd44ab 100644
--- a/include/bitsery/ext/inheritance.h
+++ b/include/bitsery/ext/inheritance.h
@@ -36,7 +36,7 @@ namespace bitsery {
         class InheritanceContext {
         public:
             explicit InheritanceContext(MemResourceBase* memResource = nullptr)
-                :_virtualBases{pointer_utils::StdPolyAlloc<const void*>{memResource}}
+                :_virtualBases{0, std::hash<const void*>{}, std::equal_to<const void*>{}, pointer_utils::StdPolyAlloc<const void*>{memResource}}
                 {}
             InheritanceContext(const InheritanceContext&) = delete;
             InheritanceContext&operator = (const InheritanceContext&) = delete;
diff --git a/include/bitsery/ext/utils/memory_resource.h b/include/bitsery/ext/utils/memory_resource.h
index 472965a..18b3f31 100644
--- a/include/bitsery/ext/utils/memory_resource.h
+++ b/include/bitsery/ext/utils/memory_resource.h
@@ -24,6 +24,7 @@
 #define BITSERY_EXT_MEMORY_RESOURCE_H
 
 #include "../../details/serialization_common.h"
+#include <cstddef>
 #include <new>
 
 namespace bitsery {
@@ -128,6 +129,40 @@ namespace bitsery {
             public:
                 using value_type = T;
 
+                using pointer = T*;
+                using const_pointer = const T*;
+                using reference = T&;
+                using const_reference = const T&;
+                using size_type = size_t;
+                using difference_type = ptrdiff_t;
+
+                size_t max_size() const noexcept {
+                    return std::numeric_limits<size_t>::max() / sizeof(value_type);
+                }
+
+                void construct(T *p, const T &val) {
+                    new((void *) p) T(val);
+                }
+
+                template<class U, class... Args>
+                void construct(U *p, Args &&... args) {
+                    new((void *) p) U(std::forward<Args>(args)...);
+                }
+
+                void destroy(T *p) {
+                    p->~T();
+                }
+
+                template<class U>
+                void destroy(U *p) {
+                    p->~U();
+                }
+
+                template<typename U>
+                struct rebind {
+                    using other = StdPolyAlloc<U>;
+                };
+
                 explicit constexpr StdPolyAlloc(MemResourceBase* memResource)
                     :_alloc{memResource} {}
                 explicit constexpr StdPolyAlloc(PolyAllocWithTypeId alloc) : _alloc{alloc} {}
diff --git a/include/bitsery/ext/utils/pointer_utils.h b/include/bitsery/ext/utils/pointer_utils.h
index f6f90da..6b65600 100644
--- a/include/bitsery/ext/utils/pointer_utils.h
+++ b/include/bitsery/ext/utils/pointer_utils.h
@@ -153,7 +153,7 @@ namespace bitsery {
             public:
                 explicit PointerLinkingContextSerialization(MemResourceBase* memResource = nullptr)
                     : _currId{0},
-                      _ptrMap{StdPolyAlloc<std::pair<const void* const, PLCInfoSerializer>>{memResource}} {}
+                      _ptrMap{0, std::hash<const void*>{}, std::equal_to<const void*>{}, StdPolyAlloc<std::pair<const void* const, PLCInfoSerializer>>{memResource}} {}
 
                 PointerLinkingContextSerialization(const PointerLinkingContextSerialization&) = delete;
 
@@ -198,7 +198,7 @@ namespace bitsery {
             public:
                 explicit PointerLinkingContextDeserialization(MemResourceBase* memResource = nullptr)
                     : _memResource{memResource},
-                    _idMap{StdPolyAlloc<std::pair<const size_t, PLCInfoDeserializer>>{memResource}} {}
+                    _idMap{0, std::hash<size_t>{}, std::equal_to<size_t>{}, StdPolyAlloc<std::pair<const size_t, PLCInfoDeserializer>>{memResource}} {}
 
                 PointerLinkingContextDeserialization(const PointerLinkingContextDeserialization&) = delete;
 
diff --git a/include/bitsery/ext/utils/polymorphism_utils.h b/include/bitsery/ext/utils/polymorphism_utils.h
index 6678230..a2cef4d 100644
--- a/include/bitsery/ext/utils/polymorphism_utils.h
+++ b/include/bitsery/ext/utils/polymorphism_utils.h
@@ -185,11 +185,8 @@ namespace bitsery {
 
             explicit PolymorphicContext(MemResourceBase* memResource = nullptr)
                 :_memResource{memResource},
-                _baseToDerivedMap{pointer_utils::StdPolyAlloc<std::pair<const BaseToDerivedKey,
-                std::shared_ptr<PolymorphicHandlerBase>>>{memResource}},
-                 _baseToDerivedArray{pointer_utils::StdPolyAlloc<std::pair<const size_t,
-                     std::vector<size_t, pointer_utils::StdPolyAlloc<size_t>>>>{memResource}}
-            {}
+                _baseToDerivedMap{0, BaseToDerivedKeyHashier{}, std::equal_to<BaseToDerivedKey>{}, pointer_utils::StdPolyAlloc<std::pair<const BaseToDerivedKey, std::shared_ptr<PolymorphicHandlerBase>>>{memResource}},
+                _baseToDerivedArray{0, std::hash<size_t>{}, std::equal_to<size_t>{}, pointer_utils::StdPolyAlloc<std::pair<const size_t, std::vector<size_t, pointer_utils::StdPolyAlloc<size_t>>>>{memResource}} {}
 
             PolymorphicContext(const PolymorphicContext& ) = delete;
             PolymorphicContext& operator = (const PolymorphicContext&) = delete;