diff --git a/llvm/include/llvm/ADT/SmallVector.h b/llvm/include/llvm/ADT/SmallVector.h
--- a/llvm/include/llvm/ADT/SmallVector.h
+++ b/llvm/include/llvm/ADT/SmallVector.h
@@ -465,6 +465,10 @@
     append(IL.begin(), IL.end());
   }
 
+  template <typename ContainerTy> void append(ContainerTy &&C) {
+    append(C.begin(), C.end());
+  }
+
   // FIXME: Consider assigning over existing elements, rather than clearing &
   // re-initializing them - for all assign(...) variants.
 
@@ -490,6 +494,10 @@
     append(IL);
   }
 
+  template <typename ContainerTy> void assign(ContainerTy &&C) {
+    assign(C.begin(), C.end());
+  }
+
   iterator erase(const_iterator CI) {
     // Just cast away constness because this is a non-const member function.
     iterator I = const_cast<iterator>(CI);
diff --git a/llvm/unittests/ADT/SmallVectorTest.cpp b/llvm/unittests/ADT/SmallVectorTest.cpp
--- a/llvm/unittests/ADT/SmallVectorTest.cpp
+++ b/llvm/unittests/ADT/SmallVectorTest.cpp
@@ -438,6 +438,20 @@
   this->assertValuesInOrder(this->theVector, 3u, 1, 7, 7);
 }
 
+// Append container test.
+TYPED_TEST(SmallVectorTest, AppendContainerTest) {
+  SCOPED_TRACE("AppendContainerTest");
+
+  std::array<Constructable, 2> Array = {1, 2};
+  std::vector<Constructable> Vector = {3, 4};
+  ArrayRef<Constructable> TheArrayRef(Vector);
+
+  this->theVector.append(Array);
+  this->theVector.append(Vector);
+  this->theVector.append(TheArrayRef);
+  this->assertValuesInOrder(this->theVector, 6u, 1, 2, 3, 4, 3, 4);
+}
+
 struct output_iterator {
   typedef std::output_iterator_tag iterator_category;
   typedef int value_type;
@@ -484,6 +498,22 @@
   this->assertValuesInOrder(this->theVector, 2u, 7, 7);
 }
 
+// Assign container test.
+TYPED_TEST(SmallVectorTest, AssignContainerTest) {
+  SCOPED_TRACE("AssignContainerTest");
+
+  std::array<Constructable, 2> Array = {1, 2};
+  std::vector<Constructable> Vector = {3, 4};
+  ArrayRef<Constructable> TheArrayRef(Vector);
+
+  this->theVector.assign(Array);
+  this->assertValuesInOrder(this->theVector, 2u, 1, 2);
+  this->theVector.assign(Vector);
+  this->assertValuesInOrder(this->theVector, 2u, 3, 4);
+  this->theVector.assign(TheArrayRef);
+  this->assertValuesInOrder(this->theVector, 2u, 3, 4);
+}
+
 // Move-assign test
 TYPED_TEST(SmallVectorTest, MoveAssignTest) {
   SCOPED_TRACE("MoveAssignTest");