2 files changed, 26 insertions, 0 deletions
diff --git a/absl/numeric/int128.h b/absl/numeric/int128.h
index 235361a..198aa19 100644
--- a/absl/numeric/int128.h
+++ b/absl/numeric/int128.h
@@ -810,6 +810,14 @@ inline bool operator>=(uint128 lhs, uint128 rhs) { return !(lhs < rhs); }
 
 // Unary operators.
 
+constexpr inline uint128 operator+(uint128 val) {
+  return val;
+}
+
+constexpr inline int128 operator+(int128 val) {
+  return val;
+}
+
 inline uint128 operator-(uint128 val) {
   uint64_t hi = ~Uint128High64(val);
   uint64_t lo = ~Uint128Low64(val) + 1;
diff --git a/absl/numeric/int128_test.cc b/absl/numeric/int128_test.cc
index bc86c71..c445d89 100644
--- a/absl/numeric/int128_test.cc
+++ b/absl/numeric/int128_test.cc
@@ -226,6 +226,11 @@ TEST(Uint128, AllTests) {
   EXPECT_EQ(test >>= 1, one);
   EXPECT_EQ(test <<= 1, two);
 
+  EXPECT_EQ(big, +big);
+  EXPECT_EQ(two, +two);
+  EXPECT_EQ(absl::Uint128Max(), +absl::Uint128Max());
+  EXPECT_EQ(zero, +zero);
+
   EXPECT_EQ(big, -(-big));
   EXPECT_EQ(two, -((-one) - 1));
   EXPECT_EQ(absl::Uint128Max(), -one);
@@ -769,6 +774,19 @@ TEST(Int128, ComparisonTest) {
   }
 }
 
+TEST(Int128, UnaryPlusTest) {
+  int64_t values64[] = {0, 1, 12345, 0x4000000000000000,
+                        std::numeric_limits<int64_t>::max()};
+  for (int64_t value : values64) {
+    SCOPED_TRACE(::testing::Message() << "value = " << value);
+
+    EXPECT_EQ(absl::int128(value), +absl::int128(value));
+    EXPECT_EQ(absl::int128(-value), +absl::int128(-value));
+    EXPECT_EQ(absl::MakeInt128(value, 0), +absl::MakeInt128(value, 0));
+    EXPECT_EQ(absl::MakeInt128(-value, 0), +absl::MakeInt128(-value, 0));
+  }
+}
+
 TEST(Int128, UnaryNegationTest) {
   int64_t values64[] = {0, 1, 12345, 0x4000000000000000,
                         std::numeric_limits<int64_t>::max()};