#### basic_random_access_file::write_some_at

Write some data to the handle at the specified offset.

    template<
        typename ConstBufferSequence>
    std::size_t write_some_at(
        uint64_t offset,
        const ConstBufferSequence & buffers);
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    template<
        typename ConstBufferSequence>
    std::size_t write_some_at(
        uint64_t offset,
        const ConstBufferSequence & buffers,
        asio::error_code & ec);
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