X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FADT%2FSetVector.h;h=d2f7286c2596d66496ebc0018fc7e8865b9d61d8;hb=6d42bbfe5e18f7256049435f2e23d11aeee670f1;hp=acc4daf1468f9d237dccef3d85b767ad43e05bc5;hpb=5d37976090df34f003e5128e39593b763be0ca71;p=oota-llvm.git

diff --git a/include/llvm/ADT/SetVector.h b/include/llvm/ADT/SetVector.h
index acc4daf1468..d2f7286c259 100644
--- a/include/llvm/ADT/SetVector.h
+++ b/include/llvm/ADT/SetVector.h
@@ -126,6 +126,30 @@ public:
     return false;
   }
 
+  /// \brief Remove items from the set vector based on a predicate function.
+  ///
+  /// This is intended to be equivalent to the following code, if we could
+  /// write it:
+  ///
+  /// \code
+  ///   V.erase(std::remove_if(V.begin(), V.end(), P), V.end());
+  /// \endcode
+  ///
+  /// However, SetVector doesn't expose non-const iterators, making any
+  /// algorithm like remove_if impossible to use.
+  ///
+  /// \returns true if any element is removed.
+  template <typename UnaryPredicate>
+  bool remove_if(UnaryPredicate P) {
+    typename vector_type::iterator I
+      = std::remove_if(vector_.begin(), vector_.end(),
+                       TestAndEraseFromSet<UnaryPredicate>(P, set_));
+    if (I == vector_.end())
+      return false;
+    vector_.erase(I, vector_.end());
+    return true;
+  }
+
 
   /// \brief Count the number of elements of a given key in the SetVector.
   /// \returns 0 if the element is not in the SetVector, 1 if it is.
@@ -161,6 +185,29 @@ public:
   }
 
 private:
+  /// \brief A wrapper predicate designed for use with std::remove_if.
+  ///
+  /// This predicate wraps a predicate suitable for use with std::remove_if to
+  /// call set_.erase(x) on each element which is slated for removal.
+  template <typename UnaryPredicate>
+  class TestAndEraseFromSet {
+    UnaryPredicate P;
+    set_type &set_;
+
+  public:
+    typedef typename UnaryPredicate::argument_type argument_type;
+
+    TestAndEraseFromSet(UnaryPredicate P, set_type &set_) : P(P), set_(set_) {}
+
+    bool operator()(argument_type Arg) {
+      if (P(Arg)) {
+        set_.erase(Arg);
+        return true;
+      }
+      return false;
+    }
+  };
+
   set_type set_;         ///< The set.
   vector_type vector_;   ///< The vector.
 };