patch 8.1.1111: it is not easy to check for infinity
Problem: It is not easy to check for infinity.
Solution: Add isinf(). (Ozaki Kiichi, closes #3787)
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index a367946..c764f9a 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -2411,6 +2411,8 @@
insert({object}, {item} [, {idx}]) List insert {item} in {object} [before {idx}]
invert({expr}) Number bitwise invert
isdirectory({directory}) Number |TRUE| if {directory} is a directory
+isinf({expr}) Number determine if {expr} is infinity value
+ (positive or negative)
islocked({expr}) Number |TRUE| if {expr} is locked
isnan({expr}) Number |TRUE| if {expr} is NaN
items({dict}) List key-value pairs in {dict}
@@ -5772,6 +5774,16 @@
exist, or isn't a directory, the result is |FALSE|. {directory}
is any expression, which is used as a String.
+isinf({expr}) *isinf()*
+ Return 1 if {expr} is a positive infinity, or -1 a negative
+ infinity, otherwise 0. >
+ :echo isinf(1.0 / 0.0)
+< 1 >
+ :echo isinf(-1.0 / 0.0)
+< -1
+
+ {only available when compiled with the |+float| feature}
+
islocked({expr}) *islocked()* *E786*
The result is a Number, which is |TRUE| when {expr} is the
name of a locked variable.