Add a comment for why Demangler::isDigit isn't just std::isdigit.

swiftlang · Nov 18, 2015 · 7c68fc1 · 7c68fc1
1 parent 0b79ecf
commit 7c68fc1
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/include/swift/Basic/Demangle.h b/include/swift/Basic/Demangle.h
@@ -407,6 +407,10 @@ class DemanglerPrinter {
   std::string &Stream;
 };
 
+/// Is a character considered a digit by the demangling grammar?
+///
+/// Yes, this is equivalent to the standard C isdigit(3), but some platforms
+/// give isdigit suboptimal implementations.
 static inline bool isDigit(int c) {
   return c >= '0' && c <= '9';
 }