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#

# Source code for langchain.memory.chat_message_histories.in_memory

    from typing import List

    from pydantic import BaseModel

    from langchain.schema import (
        AIMessage,
        BaseChatMessageHistory,
        BaseMessage,
        HumanMessage,
    )

    class ChatMessageHistory(BaseChatMessageHistory, BaseModel):
        messages: List[BaseMessage] = []

        def add_user_message(self, message: str) -> None:
            self.messages.append(HumanMessage(content=message))

        def add_ai_message(self, message: str) -> None:
            self.messages.append(AIMessage(content=message))

        def clear(self) -> None:
            self.messages = []