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(parent: 5e8674d) | patch

Add macros for looping through a List without a ListCell.

Add macros for looping through a List without a ListCell.

Many foreach loops only use the ListCell pointer to retrieve the
content of the cell, like so:

ListCell *lc;

foreach(lc, mylist)
{
int myint = lfirst_int(lc);

...
}

This commit adds a few convenience macros that automatically
declare the loop variable and retrieve the current cell's contents.
This allows us to rewrite the previous loop like this:

foreach_int(myint, mylist)
{
...
}

This commit also adjusts a few existing loops in order to add
coverage for the new/adjusted macros. There is presently no plan
to bulk update all foreach loops, as that could introduce a
significant amount of back-patching pain. Instead, these macros
are primarily intended for use in new code.

Author: Jelte Fennema-Nio
Reviewed-by: David Rowley, Alvaro Herrera, Vignesh C, Tom Lane
Discussion: https://postgr.es/m/CAGECzQSwXKnxGwW1_Q5JE%2B8Ja20kyAbhBHO04vVrQsLcDciwXA%40mail.gmail.com

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