write rfind in terms of npos as daniel requested

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82414 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 6 deletions

diff --git a/include/llvm/ADT/StringRef.h b/include/llvm/ADT/StringRef.h
index 510a51b..e4fd258 100644
--- a/include/llvm/ADT/StringRef.h
+++ b/include/llvm/ADT/StringRef.h
@@ -169,8 +169,10 @@ namespace llvm {
     ///
     /// \return - The index of the last occurence of \arg C, or npos if not
     /// found.
-    size_t rfind(char C, size_t From) const {
-      for (size_t i = From, e = 0; i != e;) {
+    size_t rfind(char C, size_t From = npos) const {
+      From = std::min(From, Length);
+      size_t i = From;
+      while (i != 0) {
         --i;
         if (Data[i] == C)
           return i;
@@ -178,10 +180,6 @@ namespace llvm {
       return npos;
     }
     
-    size_t rfind(char C) const {
-      return rfind(C, Length);
-    }
-    
     /// rfind - Search for the last string \arg Str in the string.
     ///
     /// \return - The index of the last occurence of \arg Str, or npos if not