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docs/dispatcher/class_based_handlers/index.rst

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+====================
+Class based handlers
+====================
+
+A handler is a async callable which takes a event with contextual data and returns a response.
+
+In **aiogram** it can be more than just an async function, these allow you to use classes
+which can be used as Telegram event handlers to structure your event handlers and reuse code by harnessing inheritance and mixins.
+
+There are some base class based handlers what you need to use in your own handlers:
+
+.. toctree::
+
+    base
+    callback_query
+    chosen_inline_result
+    error
+    inline_query
+    message
+    poll
+    pre_checkout_query
+    shipping_query
+    chat_member