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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