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From the memory point of view, the modification of the parameter specification, to include an asterisk, together with the modification of the argument, to include the address-of operator, has a substantial effect; only the address of a structure is copied into the memory reserved for the pointer parameter:
*-- Memory allocated for trade array
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v
-----------------------------------------
0 1 2 <-- Index
*------------*------------*------------*--
| trade | trade | trade |
| object | object | object |
*------------*------------*------------*---
288
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| *-- Memory allocated for trade pointer parameter
| |
| v
| -------
| *-------*
*------> | 288 |
*-------*
Without the modification, the entire structure is copied into the memory reserved for the structure parameter:
*-- Memory allocated for trade array
|
v
-----------------------------------------
0 1 2 <-- Index
*------------*------------*------------*--
| trade | trade | trade |
| object | object | object |
*------------*------------*------------*---
288 |
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| *-- Memory allocated for trade parameter
| |
| v
| ----------------
| *----------------*
*-------> | Copied trade |
| object |
*----------------*