Add reference to IEEE 754 for behavior of issignaling

mborland · mborland · commit 5d09658d14e9 · 2025-11-14T11:48:26.000+01:00
Closes: #1215
diff --git a/doc/modules/ROOT/pages/cmath.adoc b/doc/modules/ROOT/pages/cmath.adoc
@@ -543,6 +543,7 @@ constexpr bool issignaling(Decimal x) noexcept;
 ----
 
 Effects: If x is an sNaN returns true, otherwise returns false.
+This function does not signal even if x is an sNaN per IEEE 754 section 5.7.2.
 
 === `read_payload`
 
