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Recall that C ordinarily reserves a memory chunk for each parameter whenever a function is called. Evaluated arguments are copied into those reserved memory chunks.
For example, when the trade_price function—as defined, for example,
in Segment 294—is called, a trade object from the
trades array is copied into the memory chunk reserved for
trade_price's t parameter. The following illustrates the
first call to trade_price:
*-- Memory allocated for trade array
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v
-----------------------------------------
0 1 2 <-- Index
*------------*------------*------------*--
| trade | trade | trade |
| object | object | object |
*------------*------------*------------*---
------------
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| *-- Memory allocated for trade parameter
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| v
| ------------
| *------------*
*-------> | Copied |
| object |
*------------*