1 files changed, 85 insertions, 0 deletions
diff --git a/modules/codec/c++/schema.hpp b/modules/codec/c++/schema.hpp
index 37615c5..a992a84 100644
--- a/modules/codec/c++/schema.hpp
+++ b/modules/codec/c++/schema.hpp
@@ -135,6 +135,91 @@ struct Interface<Member<Function<Requests, Responses>,Names>...> {
 
 // NOLINTEND
 } // namespace schema
+
+template<typename T, typename Schema> 
+struct schema_has_member{
+	static_assert(
+		always_false<T, Schema>,
+		"Not supported schema case");
+};
+
+/**
+ * Checks if identical type exists in schema structure
+ */
+template<typename T, typename... Members>
+struct schema_has_member<T, schema::Struct<Members...>> {
+private:
+	template<size_t i>
+	static constexpr bool value_element() {
+		if constexpr ( i < sizeof...(Members) ){
+			using MT = typename parameter_pack_type<i, Members...>::type;
+			if constexpr ( std::is_same_v<T,MT> ) {
+				return true;
+			} else {
+				return value_element<i+1u>();
+			}
+		}
+		return false;
+	}
+public:
+	static constexpr bool value = value_element<0>();
+};
+
+/**
+ *
+ */
+template<string_literal Key, typename Schema>
+struct schema_has_key {
+	static_assert(
+		always_false<Schema>,
+		"Not supported schema case");
+};
+
+template<string_literal Key, typename... Members>
+struct schema_has_key<Key, schema::Struct<Members...>> {
+private:
+	template<size_t i>
+	static constexpr bool value_element() {
+		if constexpr ( i < sizeof...(Members) ){
+			using MT = typename parameter_pack_type<i, Members...>::type;
+
+			if constexpr ( Key == MT::KeyLiteral ) {
+				return true;
+			}else{
+				return value_element<i+1u>();
+			}
+		}
+		return false;
+	}
+public:
+	static constexpr bool value = value_element<0>();
+};
+
+template<string_literal Name, typename Iface>
+struct schema_member_index {
+	static_assert(
+		always_false<Iface>,
+		"Not supported schema case");
+};
+
+template<string_literal Name, typename... MemberVals, string_literal... MemberKeys >
+struct schema_member_index<Name, schema::Interface<schema::Member<MemberVals, MemberKeys>...>> {
+	static constexpr uint64_t value = parameter_key_pack_index<Name, MemberKeys...>::value;
+};
+
+template<string_literal Name, typename Iface>
+struct schema_member_type {
+	static_assert(
+		always_false<Iface>,
+		"Not supported schema case");
+};
+
+template<string_literal Name, typename... MemberVals, string_literal... MemberKeys >
+struct schema_member_type<Name, schema::Interface<schema::Member<MemberVals, MemberKeys>...>> {
+
+	using type = typename parameter_pack_type<schema_member_index<Name, schema::Interface<schema::Member<MemberVals,MemberKeys>...>>::value, MemberVals...>::type;
+};
+
 template <class T> struct is_struct {
 	constexpr static bool value = false;
 };