diff --git a/library/include/larra/impl/public_cast.hpp b/library/include/larra/impl/public_cast.hpp
new file mode 100644
index 0000000..111909a
--- /dev/null
+++ b/library/include/larra/impl/public_cast.hpp
@@ -0,0 +1,34 @@
+#pragma once
+#include <cstddef>
+#include <type_traits>
+
+namespace larra::xmpp::impl {
+
+template <typename T, std::size_t I = 0>
+struct PublicCastTag {
+  friend constexpr auto MagicGetPrivateMember(PublicCastTag);
+};
+
+template <auto ptr, std::size_t I = 0>
+struct PublicCast {};
+
+template <typename T, typename R, R T::* ptr, std::size_t I>
+struct PublicCast<ptr, I> {
+  friend constexpr auto MagicGetPrivateMember(PublicCastTag<T, I>) {
+    return ptr;
+  }
+};
+
+template <typename T, typename R, typename... Args, R (T::*ptr)(Args...), std::size_t I>
+struct PublicCast<ptr, I> {
+  friend constexpr auto MagicGetPrivateMember(PublicCastTag<T, I>) {
+    return ptr;
+  }
+};
+
+template <typename T, std::size_t I = 0>
+constexpr auto GetPrivateMember(const T&) {
+  return MagicGetPrivateMember(PublicCastTag<std::decay_t<T>, I>{});
+};
+
+}  // namespace larra::xmpp::impl
diff --git a/library/include/larra/utils.hpp b/library/include/larra/utils.hpp
index bca4277..1141b7b 100644
--- a/library/include/larra/utils.hpp
+++ b/library/include/larra/utils.hpp
@@ -83,9 +83,9 @@ struct FieldsDescription {
    * \param value new value for field
    * \return an object of type std::decay_t<Self> with data from T with fields from \ref self and the \ref value of the field \ref ptr
    */
-  template <typename Self, typename Value, typename Type>  // NOLINTNEXTLINE
-  constexpr auto With(Type(T::* ptr), Self&& self, Value&& value) const -> std::decay_t<Self>
-    requires(std::is_constructible_v<T, impl::GetTypeT<Fs>...> && std::constructible_from<std::decay_t<Self>, T> &&
+  template <typename Self, typename Value, typename Type>
+  constexpr auto With(Type(T::* ptr), Self&& self, Value&& value) const
+    requires(std::is_constructible_v<T, impl::GetTypeT<Fs>...> && std::is_constructible_v<std::decay_t<Self>, T> &&
              std::is_constructible_v<Type, decltype(value)> && impl::SetConcept<Self, Type, Fs...>)
   {
     return std::decay_t<Self>{utempl::Unpack(this->tuple, [&](auto... fs) -> T {