diff --git a/headers/meta.hpp/meta_fwd.hpp b/headers/meta.hpp/meta_fwd.hpp
index c8c1b25..34981a0 100644
--- a/headers/meta.hpp/meta_fwd.hpp
+++ b/headers/meta.hpp/meta_fwd.hpp
@@ -40,6 +40,7 @@ namespace meta_hpp
 
 namespace meta_hpp
 {
+    class base_info;
     class class_info;
     class ctor_info;
     class data_info;
@@ -53,6 +54,7 @@ namespace meta_hpp
 
 namespace meta_hpp
 {
+    template < typename Base > class base_;
     template < typename Class > class class_;
     template < typename... Args > class ctor_;
     class data_;
@@ -70,6 +72,7 @@ namespace meta_hpp
 
     class arithmetic_type;
     class array_type;
+    class base_type;
     class class_type;
     class ctor_type;
     class enum_type;
@@ -92,6 +95,7 @@ namespace meta_hpp
     template < typename K, typename V >
     using info_map = std::map<K, V, std::less<>>;
 
+    using base_info_map = info_map<type_id, base_info>;
     using class_info_map = info_map<std::string, class_info>;
     using ctor_info_map = info_map<type_id, ctor_info>;
     using data_info_map = info_map<std::string, data_info>;
diff --git a/headers/meta.hpp/meta_infos.hpp b/headers/meta.hpp/meta_infos.hpp
index 9ac7f25..d4be547 100644
--- a/headers/meta.hpp/meta_infos.hpp
+++ b/headers/meta.hpp/meta_infos.hpp
@@ -8,6 +8,7 @@
 
 #include "meta_fwd.hpp"
 
+#include "meta_infos/base_info.hpp"
 #include "meta_infos/class_info.hpp"
 #include "meta_infos/ctor_info.hpp"
 #include "meta_infos/data_info.hpp"
diff --git a/headers/meta.hpp/meta_infos/base_info.hpp b/headers/meta.hpp/meta_infos/base_info.hpp
new file mode 100644
index 0000000..9f812b5
--- /dev/null
+++ b/headers/meta.hpp/meta_infos/base_info.hpp
@@ -0,0 +1,93 @@
+/*******************************************************************************
+ * This file is part of the "https://github.com/blackmatov/meta.hpp"
+ * For conditions of distribution and use, see copyright notice in LICENSE.md
+ * Copyright (C) 2021, by Matvey Cherevko (blackmatov@gmail.com)
+ ******************************************************************************/
+
+#pragma once
+
+#include "_infos_fwd.hpp"
+
+#include "data_info.hpp"
+
+namespace meta_hpp
+{
+    class base_info final {
+    public:
+        base_info() = default;
+
+        void merge(const base_info& other);
+        explicit operator bool() const noexcept;
+
+        const base_type& type() const noexcept;
+    public:
+        template < typename F >
+        void visit(F&& f) const;
+
+        template < typename F >
+        void each_data(F&& f) const;
+
+        data_info get_data_by_name(std::string_view name) const noexcept;
+    private:
+        template < typename Base > friend class base_;
+
+        template < typename Base, typename Derived >
+        explicit base_info(typename_arg_t<Base>, typename_arg_t<Derived>);
+    private:
+        struct state;
+        std::shared_ptr<state> state_;
+    };
+}
+
+namespace meta_hpp
+{
+    struct base_info::state final {
+        base_type type;
+        data_info_map datas;
+    };
+}
+
+namespace meta_hpp
+{
+    inline void base_info::merge(const base_info& other) {
+        (void)other;
+        ///TODO: implme
+    }
+
+    inline base_info::operator bool() const noexcept {
+        return !!state_;
+    }
+
+    inline const base_type& base_info::type() const noexcept {
+        return state_->type;
+    }
+}
+
+namespace meta_hpp
+{
+    template < typename F >
+    void base_info::visit(F&& f) const {
+        each_data(f);
+    }
+
+    template < typename F >
+    void base_info::each_data(F&& f) const {
+        for ( auto&& name_info : state_->datas ) {
+            std::invoke(f, name_info.second);
+        }
+    }
+
+    inline data_info base_info::get_data_by_name(std::string_view name) const noexcept {
+        return detail::find_or_default(state_->datas, name);
+    }
+}
+
+namespace meta_hpp
+{
+    template < typename Base, typename Derived >
+    base_info::base_info(typename_arg_t<Base>, typename_arg_t<Derived>)
+    : state_{std::make_shared<state>(state{
+        base_type{typename_arg<Base>, typename_arg<Derived>},
+        {}
+    })} {}
+}
diff --git a/headers/meta.hpp/meta_infos/class_info.hpp b/headers/meta.hpp/meta_infos/class_info.hpp
index 00d9e49..90d2af6 100644
--- a/headers/meta.hpp/meta_infos/class_info.hpp
+++ b/headers/meta.hpp/meta_infos/class_info.hpp
@@ -8,6 +8,7 @@
 
 #include "_infos_fwd.hpp"
 
+#include "base_info.hpp"
 #include "ctor_info.hpp"
 #include "data_info.hpp"
 #include "enum_info.hpp"
@@ -26,10 +27,23 @@ namespace meta_hpp
 
         const std::string& name() const noexcept;
         const class_type& type() const noexcept;
+
+        template < typename Base >
+        bool is_derived_from() const;
+        bool is_derived_from(any_type base) const noexcept;
+
+        template < typename... Args >
+        ctor_info get_ctor_by_args() const noexcept;
+        template < std::size_t Args >
+        ctor_info get_ctor_by_args(const std::array<any_type, Args>& args) const noexcept;
+        ctor_info get_ctor_by_args(const std::vector<any_type>& args) const noexcept;
     public:
         template < typename F >
         void visit(F&& f) const;
 
+        template < typename F >
+        void each_base(F&& f) const;
+
         template < typename F >
         void each_class(F&& f) const;
 
@@ -73,6 +87,7 @@ namespace meta_hpp
     struct class_info::state final {
         std::string name;
         class_type type;
+        base_info_map bases;
         class_info_map classes;
         ctor_info_map ctors;
         data_info_map datas;
@@ -101,12 +116,62 @@ namespace meta_hpp
     inline const class_type& class_info::type() const noexcept {
         return state_->type;
     }
+
+    template < typename Base >
+    bool class_info::is_derived_from() const {
+        return class_info::is_derived_from(type_db::get<Base>());
+    }
+
+    inline bool class_info::is_derived_from(any_type base) const noexcept {
+        for ( auto&& id_info : state_->bases ) {
+            if ( base.id() == id_info.second.type().base_class_type().id() ) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    template < typename... Args >
+    ctor_info class_info::get_ctor_by_args() const noexcept {
+        std::array<any_type, sizeof...(Args)> args{type_db::get<Args>()...};
+        return get_ctor_by_args(args);
+    }
+
+    template < std::size_t Args >
+    ctor_info class_info::get_ctor_by_args(const std::array<any_type, Args>& args) const noexcept {
+        for ( auto&& id_info : state_->ctors ) {
+            const std::vector<any_type>& ctor_args =
+                id_info.second.type().argument_types();
+
+            if ( args.size() == ctor_args.size()
+                && std::equal(args.begin(), args.end(), ctor_args.begin()) )
+            {
+                return id_info.second;
+            }
+        }
+        return ctor_info{};
+    }
+
+    inline ctor_info class_info::get_ctor_by_args(const std::vector<any_type>& args) const noexcept {
+        for ( auto&& id_info : state_->ctors ) {
+            const std::vector<any_type>& ctor_args =
+                id_info.second.type().argument_types();
+
+            if ( args.size() == ctor_args.size()
+                && std::equal(args.begin(), args.end(), ctor_args.begin()) )
+            {
+                return id_info.second;
+            }
+        }
+        return ctor_info{};
+    }
 }
 
 namespace meta_hpp
 {
     template < typename F >
     void class_info::visit(F&& f) const {
+        each_base(f);
         each_class(f);
         each_ctor(f);
         each_data(f);
@@ -116,6 +181,13 @@ namespace meta_hpp
         each_method(f);
     }
 
+    template < typename F >
+    void class_info::each_base(F&& f) const {
+        for ( auto&& id_info : state_->bases ) {
+            std::invoke(f, id_info.second);
+        }
+    }
+
     template < typename F >
     void class_info::each_class(F&& f) const {
         for ( auto&& name_info : state_->classes ) {
@@ -197,6 +269,6 @@ namespace meta_hpp
     : state_{std::make_shared<state>(state{
         std::move(name),
         type_db::get<Class>().template as<class_type>(),
-        {}, {}, {}, {}, {}, {}, {}
+        {}, {}, {}, {}, {}, {}, {}, {}
     })} {}
 }
diff --git a/headers/meta.hpp/meta_registry.hpp b/headers/meta.hpp/meta_registry.hpp
index 6b65af1..4cefc0c 100644
--- a/headers/meta.hpp/meta_registry.hpp
+++ b/headers/meta.hpp/meta_registry.hpp
@@ -9,6 +9,7 @@
 #include "meta_fwd.hpp"
 #include "meta_infos.hpp"
 
+#include "meta_registry/base_.hpp"
 #include "meta_registry/class_.hpp"
 #include "meta_registry/ctor_.hpp"
 #include "meta_registry/data_.hpp"
@@ -48,6 +49,7 @@ namespace meta_hpp
         void add_(const std::string& prefix, ...) = delete;
     private:
         struct add_info_f;
+        void add_info_(const std::string& prefix, const base_info& info);
         void add_info_(const std::string& prefix, const class_info& info);
         void add_info_(const std::string& prefix, const ctor_info& info);
         void add_info_(const std::string& prefix, const data_info& info);
@@ -149,6 +151,11 @@ namespace meta_hpp
         }
     };
 
+    inline void registry::add_info_(const std::string& prefix, const base_info& info) {
+        (void)prefix;
+        (void)info;
+    }
+
     inline void registry::add_info_(const std::string& prefix, const class_info& info) {
         std::string name = prefix.empty() ? info.name() : prefix + "::" + info.name();
         info.visit(kari_hpp::curry(add_info_f{}, std::ref(*this), name));
diff --git a/headers/meta.hpp/meta_registry/base_.hpp b/headers/meta.hpp/meta_registry/base_.hpp
new file mode 100644
index 0000000..bca1673
--- /dev/null
+++ b/headers/meta.hpp/meta_registry/base_.hpp
@@ -0,0 +1,58 @@
+/*******************************************************************************
+ * This file is part of the "https://github.com/blackmatov/meta.hpp"
+ * For conditions of distribution and use, see copyright notice in LICENSE.md
+ * Copyright (C) 2021, by Matvey Cherevko (blackmatov@gmail.com)
+ ******************************************************************************/
+
+#pragma once
+
+#include "_registry_fwd.hpp"
+
+#include "data_.hpp"
+
+namespace meta_hpp
+{
+    template < typename Base >
+    class base_ final {
+    public:
+        explicit base_() = default;
+
+        template < typename Derived >
+        base_info make_info() const;
+    public:
+        template < typename... Internals >
+        base_& operator()(Internals&&...internals);
+    private:
+        void add_(const data_& internal);
+        void add_(...) = delete;
+    private:
+        data_info_map datas_;
+    };
+}
+
+namespace meta_hpp
+{
+    template < typename Base >
+    template < typename Derived >
+    base_info base_<Base>::make_info() const {
+        base_info info{typename_arg<Base>, typename_arg<Derived>};
+        info.state_->datas.insert(datas_.begin(), datas_.end());
+        return info;
+    }
+
+    template < typename Base >
+    template < typename... Internals >
+    base_<Base>& base_<Base>::operator()(Internals&&...internals) {
+        (add_(std::forward<Internals>(internals)), ...);
+        return *this;
+    }
+}
+
+namespace meta_hpp
+{
+    template < typename Base >
+    void base_<Base>::add_(const data_& internal) {
+        auto info = internal.make_info();
+        detail::merge_with(datas_, info.name(), info, &data_info::merge);
+    }
+}
diff --git a/headers/meta.hpp/meta_registry/class_.hpp b/headers/meta.hpp/meta_registry/class_.hpp
index cbf131c..581cbf9 100644
--- a/headers/meta.hpp/meta_registry/class_.hpp
+++ b/headers/meta.hpp/meta_registry/class_.hpp
@@ -8,6 +8,7 @@
 
 #include "_registry_fwd.hpp"
 
+#include "base_.hpp"
 #include "ctor_.hpp"
 #include "data_.hpp"
 #include "enum_.hpp"
@@ -27,6 +28,8 @@ namespace meta_hpp
         template < typename... Internals >
         class_& operator()(Internals&&...internals);
     private:
+        template < typename Base >
+        void add_(const base_<Base>& internal);
         template < typename Class2 >
         void add_(const class_<Class2>& internal);
         template < typename... Args >
@@ -43,6 +46,7 @@ namespace meta_hpp
         void add_(...) = delete;
     private:
         std::string name_;
+        base_info_map bases_;
         class_info_map classes_;
         ctor_info_map ctors_;
         data_info_map datas_;
@@ -62,6 +66,7 @@ namespace meta_hpp
     template < typename Class >
     class_info class_<Class>::make_info() const {
         class_info info{typename_arg<Class>, name_};
+        info.state_->bases.insert(bases_.begin(), bases_.end());
         info.state_->classes.insert(classes_.begin(), classes_.end());
         info.state_->ctors.insert(ctors_.begin(), ctors_.end());
         info.state_->datas.insert(datas_.begin(), datas_.end());
@@ -82,6 +87,13 @@ namespace meta_hpp
 
 namespace meta_hpp
 {
+    template < typename Class >
+    template < typename Base >
+    void class_<Class>::add_(const base_<Base>& internal) {
+        auto info = internal.template make_info<Class>();
+        detail::merge_with(bases_, info.type().id(), info, &base_info::merge);
+    }
+
     template < typename Class >
     template < typename Class2 >
     void class_<Class>::add_(const class_<Class2>& internal) {
diff --git a/headers/meta.hpp/meta_types.hpp b/headers/meta.hpp/meta_types.hpp
index 5369ff7..5265966 100644
--- a/headers/meta.hpp/meta_types.hpp
+++ b/headers/meta.hpp/meta_types.hpp
@@ -10,6 +10,7 @@
 
 #include "meta_types/arithmetic_type.hpp"
 #include "meta_types/array_type.hpp"
+#include "meta_types/base_type.hpp"
 #include "meta_types/class_type.hpp"
 #include "meta_types/ctor_type.hpp"
 #include "meta_types/enum_type.hpp"
diff --git a/headers/meta.hpp/meta_types/_types_fwd.hpp b/headers/meta.hpp/meta_types/_types_fwd.hpp
index 175b6c6..a533419 100644
--- a/headers/meta.hpp/meta_types/_types_fwd.hpp
+++ b/headers/meta.hpp/meta_types/_types_fwd.hpp
@@ -148,6 +148,7 @@ namespace meta_hpp
         std::variant<
             const arithmetic_type*,
             const array_type*,
+            const base_type*,
             const class_type*,
             const ctor_type*,
             const enum_type*,
diff --git a/headers/meta.hpp/meta_types/base_type.hpp b/headers/meta.hpp/meta_types/base_type.hpp
new file mode 100644
index 0000000..5d7fcf4
--- /dev/null
+++ b/headers/meta.hpp/meta_types/base_type.hpp
@@ -0,0 +1,77 @@
+/*******************************************************************************
+ * This file is part of the "https://github.com/blackmatov/meta.hpp"
+ * For conditions of distribution and use, see copyright notice in LICENSE.md
+ * Copyright (C) 2021, by Matvey Cherevko (blackmatov@gmail.com)
+ ******************************************************************************/
+
+#pragma once
+
+#include "_types_fwd.hpp"
+
+namespace meta_hpp
+{
+    class base_type final : public type_base {
+    public:
+        base_type() = default;
+
+        base_type(base_type&&) = default;
+        base_type& operator=(base_type&&) = default;
+
+        base_type(const base_type&) = default;
+        base_type& operator=(const base_type&) = default;
+
+        template < typename Base, typename Derived >
+        explicit base_type(typename_arg_t<Base>, typename_arg_t<Derived>);
+
+        any_type base_class_type() const noexcept;
+        any_type derived_class_type() const noexcept;
+    private:
+        struct state;
+        std::shared_ptr<state> state_;
+    };
+}
+
+namespace meta_hpp::detail
+{
+    template < typename Base, typename Derived >
+    struct base_traits {
+        static_assert(std::is_base_of_v<Base, Derived>);
+
+        using base_class_type = Base;
+        using derived_class_type = Derived;
+
+        static any_type make_base_class_type() {
+            return type_db::get<base_class_type>();
+        }
+
+        static any_type make_derived_class_type() {
+            return type_db::get<derived_class_type>();
+        }
+    };
+}
+
+namespace meta_hpp
+{
+    struct base_type::state final {
+        const any_type base_class_type;
+        const any_type derived_class_type;
+    };
+
+    template < typename Base, typename Derived >
+    base_type::base_type(typename_arg_t<Base>, typename_arg_t<Derived>)
+    : type_base{typename_arg<struct base_type_tag, Base, Derived>}
+    , state_{std::make_shared<state>(state{
+        detail::base_traits<Base, Derived>::make_base_class_type(),
+        detail::base_traits<Base, Derived>::make_derived_class_type(),
+    })} {
+        static_assert(std::is_base_of_v<Base, Derived>);
+    }
+
+    inline any_type base_type::base_class_type() const noexcept {
+        return state_->base_class_type;
+    }
+
+    inline any_type base_type::derived_class_type() const noexcept {
+        return state_->derived_class_type;
+    }
+}
diff --git a/headers/meta.hpp/meta_utilities/arg.hpp b/headers/meta.hpp/meta_utilities/arg.hpp
index 291a56d..45cc6ed 100644
--- a/headers/meta.hpp/meta_utilities/arg.hpp
+++ b/headers/meta.hpp/meta_utilities/arg.hpp
@@ -59,16 +59,16 @@ namespace meta_hpp
     template < typename T
              , std::enable_if_t<!std::is_reference_v<T>, int> >
     inline arg::arg(T&& v)
-    : data_{const_cast<add_ptr_t<remove_cvref_t<T>>>(std::addressof(v))}
-    , raw_type_{type_db::get<remove_cvref_t<T>>()}
+    : data_{const_cast<std::add_pointer_t<stdex::remove_cvref_t<T>>>(std::addressof(v))}
+    , raw_type_{type_db::get<stdex::remove_cvref_t<T>>()}
     , ref_type_{std::is_const_v<T> ? ref_types::crref : ref_types::rref} {}
 
     template < typename T
              , std::enable_if_t<std::is_lvalue_reference_v<T>, int> >
     inline arg::arg(T&& v)
-    : data_{const_cast<add_ptr_t<remove_cvref_t<T>>>(std::addressof(v))}
-    , raw_type_{type_db::get<remove_cvref_t<T>>()}
-    , ref_type_{std::is_const_v<remove_ref_t<T>> ? ref_types::cref : ref_types::ref} {}
+    : data_{const_cast<std::add_pointer_t<stdex::remove_cvref_t<T>>>(std::addressof(v))}
+    , raw_type_{type_db::get<stdex::remove_cvref_t<T>>()}
+    , ref_type_{std::is_const_v<std::remove_reference_t<T>> ? ref_types::cref : ref_types::ref} {}
 
     template < typename To >
     inline To arg::cast() const {
@@ -81,7 +81,7 @@ namespace meta_hpp
         }
 
         if constexpr ( std::is_reference_v<To> ) {
-            using raw_type = remove_cvref_t<To>;
+            using raw_type = stdex::remove_cvref_t<To>;
 
             if constexpr ( std::is_lvalue_reference_v<To> ) {
                 return *static_cast<raw_type*>(data_);
@@ -93,7 +93,7 @@ namespace meta_hpp
         }
 
         if constexpr ( !std::is_pointer_v<To> && !std::is_reference_v<To> ) {
-            using raw_type = remove_cvref_t<To>;
+            using raw_type = stdex::remove_cvref_t<To>;
 
             if ( ref_type() == ref_types::ref ) {
                 if constexpr ( std::is_constructible_v<To, raw_type&> ) {
@@ -126,14 +126,14 @@ namespace meta_hpp
     template < typename To >
     inline bool arg::can_cast() const noexcept {
         if constexpr ( std::is_pointer_v<To> ) {
-            using to_raw_type = remove_cv_t<To>;
-            using to_raw_ptr_type = remove_cv_t<std::remove_pointer_t<to_raw_type>>;
+            using to_raw_type = std::remove_cv_t<To>;
+            using to_raw_ptr_type = std::remove_cv_t<std::remove_pointer_t<to_raw_type>>;
             return raw_type().id() == type_db::get<to_raw_type>().id()
-                || raw_type().id() == type_db::get<add_ptr_t<to_raw_ptr_type>>().id();
+                || raw_type().id() == type_db::get<std::add_pointer_t<to_raw_ptr_type>>().id();
         }
 
         if constexpr ( std::is_lvalue_reference_v<To> ) {
-            constexpr bool to_const = std::is_const_v<remove_ref_t<To>>;
+            constexpr bool to_const = std::is_const_v<std::remove_reference_t<To>>;
 
             if ( !to_const && is_rvalue() ) {
                 return false;
@@ -143,21 +143,21 @@ namespace meta_hpp
                 return false;
             }
 
-            using to_raw_type = remove_cvref_t<To>;
+            using to_raw_type = stdex::remove_cvref_t<To>;
             if ( raw_type().id() == type_db::get<to_raw_type>().id() ) {
                 return true;
             }
 
             if constexpr ( to_const && std::is_pointer_v<to_raw_type> ) {
-                using to_raw_ptr_type = remove_cv_t<std::remove_pointer_t<to_raw_type>>;
-                return raw_type().id() == type_db::get<add_ptr_t<to_raw_ptr_type>>().id();
+                using to_raw_ptr_type = std::remove_cv_t<std::remove_pointer_t<to_raw_type>>;
+                return raw_type().id() == type_db::get<std::add_pointer_t<to_raw_ptr_type>>().id();
             }
 
             return false;
         }
 
         if constexpr ( std::is_rvalue_reference_v<To> ) {
-            constexpr bool to_const = std::is_const_v<remove_ref_t<To>>;
+            constexpr bool to_const = std::is_const_v<std::remove_reference_t<To>>;
 
             if ( !is_rvalue() ) {
                 return false;
@@ -167,21 +167,21 @@ namespace meta_hpp
                 return false;
             }
 
-            using to_raw_type = remove_cvref_t<To>;
+            using to_raw_type = stdex::remove_cvref_t<To>;
             if ( raw_type().id() == type_db::get<to_raw_type>().id() ) {
                 return true;
             }
 
             if constexpr ( to_const && std::is_pointer_v<to_raw_type> ) {
-                using to_raw_ptr_type = remove_cv_t<std::remove_pointer_t<to_raw_type>>;
-                return raw_type().id() == type_db::get<add_ptr_t<to_raw_ptr_type>>().id();
+                using to_raw_ptr_type = std::remove_cv_t<std::remove_pointer_t<to_raw_type>>;
+                return raw_type().id() == type_db::get<std::add_pointer_t<to_raw_ptr_type>>().id();
             }
 
             return false;
         }
 
         if constexpr ( !std::is_pointer_v<To> && !std::is_reference_v<To> ) {
-            using to_raw_type = remove_cv_t<To>;
+            using to_raw_type = std::remove_cv_t<To>;
             if ( raw_type().id() != type_db::get<to_raw_type>().id() ) {
                 return false;
             }
diff --git a/untests/features/infos/base_info_tests.cpp b/untests/features/infos/base_info_tests.cpp
new file mode 100644
index 0000000..032560b
--- /dev/null
+++ b/untests/features/infos/base_info_tests.cpp
@@ -0,0 +1,45 @@
+/*******************************************************************************
+ * This file is part of the "https://github.com/blackmatov/meta.hpp"
+ * For conditions of distribution and use, see copyright notice in LICENSE.md
+ * Copyright (C) 2021, by Matvey Cherevko (blackmatov@gmail.com)
+ ******************************************************************************/
+
+#include "_infos_fwd.hpp"
+
+namespace
+{
+    using namespace meta_hpp;
+    using namespace std::string_literals;
+}
+
+namespace
+{
+    class base {
+    public:
+        virtual ~base() {}
+    };
+
+    class derived final : public base {
+    public:
+        derived() = default;
+    };
+
+    struct empty final {};
+}
+
+TEST_CASE("features/infos/base") {
+    registry db;
+
+    db(
+        class_<base>{"base"},
+        class_<derived>{"derived"}(
+            base_<base>{}
+        )
+    );
+
+    REQUIRE(db.get_class_by_path("derived"));
+    const class_info derived_info = db.get_class_by_path("derived");
+
+    CHECK(derived_info.is_derived_from<base>());
+    CHECK_FALSE(derived_info.is_derived_from<empty>());
+}
diff --git a/untests/features/infos/class_info_tests.cpp b/untests/features/infos/class_info_tests.cpp
index de7996a..b0a1a99 100644
--- a/untests/features/infos/class_info_tests.cpp
+++ b/untests/features/infos/class_info_tests.cpp
@@ -8,7 +8,87 @@
 
 namespace
 {
+    using namespace meta_hpp;
+    using namespace std::string_literals;
+}
+
+namespace
+{
+    class shape {
+    public:
+        virtual ~shape() {}
+        virtual int area() const = 0;
+    };
+
+    class rectangle : public shape {
+    public:
+        rectangle(const rectangle& other) {
+            width_ = other.width_;
+            height_ = other.height_;
+        }
+
+        rectangle& operator=(const rectangle& other) {
+            if ( this != &other ) {
+                return *this;
+            }
+            width_ = other.width_;
+            height_ = other.height_;
+            return *this;
+        }
+
+        rectangle(int width, int height)
+        : width_{width}
+        , height_{height} {}
+
+        int area() const override {
+            return width_ * height_;
+        }
+
+        int width() const noexcept {
+            return width_;
+        }
+
+        int height() const noexcept {
+            return height_;
+        }
+    private:
+        int width_{};
+        int height_{};
+    };
 }
 
 TEST_CASE("features/infos/class") {
+    registry db;
+
+    db(
+        class_<shape>{"shape"}(
+            method_{"area", &shape::area}
+        ),
+        class_<rectangle>{"rectangle"}(
+            base_<shape>{},
+            ctor_<int, int>{},
+            method_{"width", &rectangle::width},
+            method_{"height", &rectangle::height}
+        )
+    );
+
+    SUBCASE("base") {
+        REQUIRE(db.get_class_by_path("shape"));
+        const class_info shape_info = db.get_class_by_path("shape");
+        CHECK(shape_info.name() == "shape");
+        CHECK(shape_info.type().id() == type_db::get<shape>().id());
+
+        CHECK_FALSE(shape_info.is_derived_from<shape>());
+        CHECK_FALSE(shape_info.is_derived_from<rectangle>());
+    }
+
+    SUBCASE("derived") {
+        REQUIRE(db.get_class_by_path("rectangle"));
+        const class_info rectangle_info = db.get_class_by_path("rectangle");
+        CHECK(rectangle_info.name() == "rectangle");
+        CHECK(rectangle_info.type().id() == type_db::get<rectangle>().id());
+
+        CHECK(rectangle_info.is_derived_from<shape>());
+        CHECK_FALSE(rectangle_info.is_derived_from<rectangle>());
+    }
 }
diff --git a/untests/features/infos/ctor_info_tests.cpp b/untests/features/infos/ctor_info_tests.cpp
index 57fe560..3a91965 100644
--- a/untests/features/infos/ctor_info_tests.cpp
+++ b/untests/features/infos/ctor_info_tests.cpp
@@ -8,7 +8,113 @@
 
 namespace
 {
+    using namespace meta_hpp;
+    using namespace std::string_literals;
+}
+
+namespace
+{
+    struct ivec2 {
+        int x{};
+        int y{};
+
+        [[maybe_unused]] ivec2() = default;
+        [[maybe_unused]] ivec2(const ivec2& other) = default;
+        [[maybe_unused]] explicit ivec2(int v): x{v}, y{v} {}
+        [[maybe_unused]] ivec2(int x, int y): x{x}, y{y} {}
+    };
 }
 
 TEST_CASE("features/infos/ctor") {
+    registry db;
+
+    db(
+        namespace_{"vmath"}(
+            class_<ivec2>{"ivec2"}(
+                ctor_<>{}(data_{"info", "void ctor"s}),
+                ctor_<const ivec2&>{}(data_{"info", "copy ctor"s}),
+                ctor_<int>{}(data_{"info", "int ctor"s}),
+                ctor_<int, int>{}(data_{"info", "int,int ctor"s})
+            )
+        )
+    );
+
+    const class_info ivec2_info = db.get_class_by_path("vmath::ivec2");
+    REQUIRE(ivec2_info);
+
+    SUBCASE("void") {
+        const ctor_info ci = ivec2_info.get_ctor_by_args();
+        REQUIRE(ci);
+
+        REQUIRE(ci.get_data_by_name("info"));
+        CHECK(ci.get_data_by_name("info").value().equals("void ctor"s));
+
+        {
+            const ctor_info ci2 = ivec2_info.get_ctor_by_args(std::array<any_type, 0>{});
+            const ctor_info ci3 = ivec2_info.get_ctor_by_args(std::vector<any_type>{});
+            REQUIRE(ci2);
+            REQUIRE(ci3);
+            CHECK(ci.type().id() == ci2.type().id());
+            CHECK(ci.type().id() == ci2.type().id());
+        }
+    }
+
+    SUBCASE("int") {
+        const ctor_info ci = ivec2_info.get_ctor_by_args<int>();
+        REQUIRE(ci);
+
+        REQUIRE(ci.get_data_by_name("info"));
+        CHECK(ci.get_data_by_name("info").value().equals("int ctor"s));
+
+        {
+            const ctor_info ci2 = ivec2_info.get_ctor_by_args(std::array<any_type, 1>{
+                type_db::get<int>()});
+            const ctor_info ci3 = ivec2_info.get_ctor_by_args(std::vector<any_type>{
+                type_db::get<int>()});
+            REQUIRE(ci2);
+            REQUIRE(ci3);
+            CHECK(ci.type().id() == ci2.type().id());
+            CHECK(ci.type().id() == ci2.type().id());
+        }
+    }
+
+    SUBCASE("const ivec2&") {
+        const ctor_info ci = ivec2_info.get_ctor_by_args<const ivec2&>();
+        REQUIRE(ci);
+
+        REQUIRE(ci.get_data_by_name("info"));
+        CHECK(ci.get_data_by_name("info").value().equals("copy ctor"s));
+
+        {
+            const ctor_info ci2 = ivec2_info.get_ctor_by_args(std::array<any_type, 1>{
+                type_db::get<const ivec2&>()});
+            const ctor_info ci3 = ivec2_info.get_ctor_by_args(std::vector<any_type>{
+                type_db::get<const ivec2&>()});
+            REQUIRE(ci2);
+            REQUIRE(ci3);
+            CHECK(ci.type().id() == ci2.type().id());
+            CHECK(ci.type().id() == ci2.type().id());
+        }
+    }
+
+    SUBCASE("int,int") {
+        const ctor_info ci = ivec2_info.get_ctor_by_args<int,int>();
+        REQUIRE(ci);
+
+        REQUIRE(ci.get_data_by_name("info"));
+        CHECK(ci.get_data_by_name("info").value().equals("int,int ctor"s));
+
+        {
+            const ctor_info ci2 = ivec2_info.get_ctor_by_args(std::array<any_type, 2>{
+                type_db::get<int>(),
+                type_db::get<int>()});
+            const ctor_info ci3 = ivec2_info.get_ctor_by_args(std::vector<any_type>{
+                type_db::get<int>(),
+                type_db::get<int>()});
+            REQUIRE(ci2);
+            REQUIRE(ci3);
+            CHECK(ci.type().id() == ci2.type().id());
+            CHECK(ci.type().id() == ci2.type().id());
+        }
+    }
 }
diff --git a/untests/features/types/base_type_tests.cpp b/untests/features/types/base_type_tests.cpp
new file mode 100644
index 0000000..d7ae407
--- /dev/null
+++ b/untests/features/types/base_type_tests.cpp
@@ -0,0 +1,30 @@
+/*******************************************************************************
+ * This file is part of the "https://github.com/blackmatov/meta.hpp"
+ * For conditions of distribution and use, see copyright notice in LICENSE.md
+ * Copyright (C) 2021, by Matvey Cherevko (blackmatov@gmail.com)
+ ******************************************************************************/
+
+#include "_types_fwd.hpp"
+
+namespace
+{
+    using namespace meta_hpp;
+    using namespace std::string_literals;
+}
+
+namespace
+{
+    struct base {
+        virtual ~base() = 0;
+    };
+
+    struct derived final : base {
+    };
+}
+
+TEST_CASE("features/types/base") {
+    base_type bt{typename_arg<base>, typename_arg<derived>};
+
+    CHECK(bt.base_class_type().id() == type_db::get<base>().id());
+    CHECK(bt.derived_class_type().id() == type_db::get<derived>().id());
+}