Changes imported from Abseil "staging" branch:

  - d1a8e5ddbf9f96a4ca020260b21e03820c5ff966 Remove references to the non-existing StringPrintf API to... by Abseil Team <absl-team@google.com>
  - 64a422bc1620b29247a81fab2b08a7f23dfc1461 Add a copy and move constructor to FixedArray.  This does... by Jon Cohen <cohenjon@google.com>

GitOrigin-RevId: d1a8e5ddbf9f96a4ca020260b21e03820c5ff966
Change-Id: I4388bdf1260702f2847307abbac4bf265e8cf90f

3 files changed, 51 insertions, 7 deletions

diff --git a/absl/container/BUILD.bazel b/absl/container/BUILD.bazel
index 7d550cb..295f412 100644
--- a/absl/container/BUILD.bazel
+++ b/absl/container/BUILD.bazel
@@ -33,6 +33,7 @@ cc_library(
         "//absl/base:core_headers",
         "//absl/base:dynamic_annotations",
         "//absl/base:throw_delegate",
+        "//absl/memory",
     ],
 )
 
@@ -42,7 +43,6 @@ cc_test(
     copts = ABSL_TEST_COPTS + ["-fexceptions"],
     deps = [
         ":fixed_array",
-        "//absl/base:core_headers",
         "//absl/base:exception_testing",
         "//absl/memory",
         "@com_google_googletest//:gtest_main",
@@ -55,7 +55,6 @@ cc_test(
     copts = ABSL_TEST_COPTS,
     deps = [
         ":fixed_array",
-        "//absl/base:core_headers",
         "//absl/base:exception_testing",
         "//absl/memory",
         "@com_google_googletest//:gtest_main",
diff --git a/absl/container/fixed_array.h b/absl/container/fixed_array.h
index 58240b4..ec6fced 100644
--- a/absl/container/fixed_array.h
+++ b/absl/container/fixed_array.h
@@ -47,6 +47,7 @@
 #include "absl/base/macros.h"
 #include "absl/base/optimization.h"
 #include "absl/base/port.h"
+#include "absl/memory/memory.h"
 
 namespace absl {
 
@@ -107,6 +108,15 @@ class FixedArray {
           ? kInlineBytesDefault / sizeof(value_type)
           : inlined;
 
+  FixedArray(const FixedArray& other) : rep_(other.begin(), other.end()) {}
+  FixedArray(FixedArray&& other) noexcept(
+  // clang-format off
+      absl::allocator_is_nothrow<std::allocator<value_type>>::value &&
+  // clang-format on
+          std::is_nothrow_move_constructible<value_type>::value)
+      : rep_(std::make_move_iterator(other.begin()),
+             std::make_move_iterator(other.end())) {}
+
   // Creates an array object that can store `n` elements.
   // Note that trivially constructible elements will be uninitialized.
   explicit FixedArray(size_type n) : rep_(n) {}
@@ -126,11 +136,9 @@ class FixedArray {
 
   ~FixedArray() {}
 
-  // Copy and move construction and assignment are deleted because (1) you can't
-  // copy or move an array, (2) assignment breaks the invariant that the size of
-  // a `FixedArray` never changes, and (3) there's no clear answer as to what
-  // should happen to a moved-from `FixedArray`.
-  FixedArray(const FixedArray&) = delete;
+  // Assignments are deleted because they break the invariant that the size of a
+  // `FixedArray` never changes.
+  void operator=(FixedArray&&) = delete;
   void operator=(const FixedArray&) = delete;
 
   // FixedArray::size()
diff --git a/absl/container/fixed_array_test.cc b/absl/container/fixed_array_test.cc
index 9e88eab..b6782f5 100644
--- a/absl/container/fixed_array_test.cc
+++ b/absl/container/fixed_array_test.cc
@@ -27,6 +27,8 @@
 #include "absl/base/internal/exception_testing.h"
 #include "absl/memory/memory.h"
 
+using ::testing::ElementsAreArray;
+
 namespace {
 
 // Helper routine to determine if a absl::FixedArray used stack allocation.
@@ -89,6 +91,41 @@ class ThreeInts {
 
 int ThreeInts::counter = 0;
 
+TEST(FixedArrayTest, CopyCtor) {
+  absl::FixedArray<int, 10> on_stack(5);
+  std::iota(on_stack.begin(), on_stack.end(), 0);
+  absl::FixedArray<int, 10> stack_copy = on_stack;
+  EXPECT_THAT(stack_copy, ElementsAreArray(on_stack));
+  EXPECT_TRUE(IsOnStack(stack_copy));
+
+  absl::FixedArray<int, 10> allocated(15);
+  std::iota(allocated.begin(), allocated.end(), 0);
+  absl::FixedArray<int, 10> alloced_copy = allocated;
+  EXPECT_THAT(alloced_copy, ElementsAreArray(allocated));
+  EXPECT_FALSE(IsOnStack(alloced_copy));
+}
+
+TEST(FixedArrayTest, MoveCtor) {
+  absl::FixedArray<std::unique_ptr<int>, 10> on_stack(5);
+  for (int i = 0; i < 5; ++i) {
+    on_stack[i] = absl::make_unique<int>(i);
+  }
+
+  absl::FixedArray<std::unique_ptr<int>, 10> stack_copy = std::move(on_stack);
+  for (int i = 0; i < 5; ++i) EXPECT_EQ(*(stack_copy[i]), i);
+  EXPECT_EQ(stack_copy.size(), on_stack.size());
+
+  absl::FixedArray<std::unique_ptr<int>, 10> allocated(15);
+  for (int i = 0; i < 15; ++i) {
+    allocated[i] = absl::make_unique<int>(i);
+  }
+
+  absl::FixedArray<std::unique_ptr<int>, 10> alloced_copy =
+      std::move(allocated);
+  for (int i = 0; i < 15; ++i) EXPECT_EQ(*(alloced_copy[i]), i);
+  EXPECT_EQ(allocated.size(), alloced_copy.size());
+}
+
 TEST(FixedArrayTest, SmallObjects) {
   // Small object arrays
   {