Availability:built-in
collation_key(+Atom,
-Key)Create a Key from Atom for locale-specific
comparison. The key is defined such that if the key of atom A
precedes the key of atom B in the standard order of terms, A
is alphabetically smaller than B using the sort order of the
current locale.
The predicate collation_key/2
is used by locale_sort/2
from library(sort). Please examine the implementation of locale_sort/2
as an example of using this call.
The Key is an implementation-defined and generally
unreadable string. On systems that do not support locale handling, Key
is simply unified with Atom.
