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Clarify eq on floats

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* doc/lispref/objects.texi (Equality Predicates):
Say that two floats with the same values might or might not be eq.
This commit is contained in:
Paul Eggert 2018-04-02 12:19:00 -07:00
parent e3525385a8
commit dfa922dd84
1 changed files with 10 additions and 0 deletions
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doc/lispref/objects.texi
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@ -2083,6 +2083,10 @@ strings), two arguments with the same contents or elements are not
necessarily @code{eq} to each other: they are @code{eq} only if they
are the same object, meaning that a change in the contents of one will
be reflected by the same change in the contents of the other.
For other types of objects whose contents cannot be changed (e.g.,
floats), two arguments with the same contents might or might not be
the same object, and @code{eq} returns @code{t} or @code{nil}
depending on whether the Lisp interpreter created one object or two.
@example
@group
@ -2095,6 +2099,12 @@ be reflected by the same change in the contents of the other.
@result{} t
@end group
@group
(eq 3.0 3.0)
@result{} t @r{or} nil
;; @r{The result is implementation-dependent.}
@end group
@group
(eq "asdf" "asdf")
@result{} nil