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A reader is a function that extracts information from an object.
When you use readers, rather than accessing structure variables directly,
you can include additional computation in a reader. For example, if you
were concerned about how often your program accesses the price
structure variables in trade structures, you could add a statement to the
read_trace_price reader that announces each access:
double read_trade_price (struct trade *tptr) {
printf ("Reading a trade price ...\n");
return tptr -> price;
}