Make pred_iterator DefaultConstructible, and add an accessor to

retrieve the underlying getOperandNo() value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126804 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/Support/CFG.h b/include/llvm/Support/CFG.h
index 9ba71fcca8a56ddc8e7bf6116f150d764418b424..d2ea12364e9f81db6853c312cf4b66867a9aebe6 100644 (file)
--- a/include/llvm/Support/CFG.h
+++ b/include/llvm/Support/CFG.h
@@ -41,6 +41,7 @@ class PredIterator : public std::iterator<std::forward_iterator_tag,
 public:
   typedef typename super::pointer pointer;
 
+  PredIterator() {}
   explicit inline PredIterator(Ptr *bb) : It(bb->use_begin()) {
     advancePastNonTerminators();
   }
@@ -64,6 +65,12 @@ public:
   inline Self operator++(int) { // Postincrement
     Self tmp = *this; ++*this; return tmp;
   }
+
+  /// getOperandNo - Return the operand number in the predecessor's
+  /// terminator of the successor.
+  unsigned getOperandNo() const {
+    return It.getOperandNo();
+  }
 };
 
 typedef PredIterator<BasicBlock, Value::use_iterator> pred_iterator;