#### basic_random_access_file::read_some_at

Read some data from the handle at the specified offset.

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