#### basic_file::open

Open the file using the specified path.

    void open(
        const char * path,
        file_base::flags open_flags);
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    void open(
        const char * path,
        file_base::flags open_flags,
        asio::error_code & ec);
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    void open(
        const std::string & path,
        file_base::flags open_flags);
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    void open(
        const std::string & path,
        file_base::flags open_flags,
        asio::error_code & ec);
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