2 files changed, 29 insertions, 1 deletions
diff --git a/absl/container/inlined_vector.h b/absl/container/inlined_vector.h
index 78f78ea70221..101ded8557eb 100644
--- a/absl/container/inlined_vector.h
+++ b/absl/container/inlined_vector.h
@@ -89,7 +89,9 @@ class InlinedVector {
       : allocator_and_tag_(alloc) {}
 
   // Create a vector with n copies of value_type().
-  explicit InlinedVector(size_type n) : allocator_and_tag_(allocator_type()) {
+  explicit InlinedVector(size_type n,
+                         const allocator_type& alloc = allocator_type())
+      : allocator_and_tag_(alloc) {
     InitAssign(n);
   }
 
diff --git a/absl/container/inlined_vector_test.cc b/absl/container/inlined_vector_test.cc
index 26a7d5bca86f..f81fad569dcd 100644
--- a/absl/container/inlined_vector_test.cc
+++ b/absl/container/inlined_vector_test.cc
@@ -1763,4 +1763,30 @@ TEST(AllocatorSupportTest, ScopedAllocatorWorks) {
   EXPECT_EQ(allocated, 0);
 }
 
+TEST(AllocatorSupportTest, SizeAllocConstructor) {
+  constexpr int inlined_size = 4;
+  using Alloc = CountingAllocator<int>;
+  using AllocVec = absl::InlinedVector<int, inlined_size, Alloc>;
+
+  {
+    auto len = inlined_size / 2;
+    int64_t allocated = 0;
+    auto v = AllocVec(len, Alloc(&allocated));
+
+    // Inline storage used; allocator should not be invoked
+    EXPECT_THAT(allocated, 0);
+    EXPECT_THAT(v, AllOf(SizeIs(len), Each(0)));
+  }
+
+  {
+    auto len = inlined_size * 2;
+    int64_t allocated = 0;
+    auto v = AllocVec(len, Alloc(&allocated));
+
+    // Out of line storage used; allocation of 8 elements expected
+    EXPECT_THAT(allocated, len * sizeof(int));
+    EXPECT_THAT(v, AllOf(SizeIs(len), Each(0)));
+  }
+}
+
 }  // anonymous namespace