record might be a single pixel from an image;
* In a video encoder, each record may be 256 pixels forming a macroblock of data; or
* In wireless signal processing, each record could be a sequence of samples received from an antenna.

For each record we can only read from the input, perform operations on it, and write to the output. It is permissible to have multiple inputs and multiple outputs, but never a piece of memory that is both readable and writable.

Code examples

By way of illustration, the following

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