Add support of 19-member structs to gmock UnpackStructImpl.

PiperOrigin-RevId: 469171380
Change-Id: Ic75fc0523924e40e620552d4c04b79dad22a68e0

googlemock/include/gmock/gmock-matchers.h

@@ -3245,6 +3245,11 @@ auto UnpackStructImpl(const T& t, MakeIndexSequence<18>, char) {
   const auto& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r] = t;
   return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r);
 }
+template <typename T>
+auto UnpackStructImpl(const T& t, MakeIndexSequence<19>, char) {
+  const auto& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s] = t;
+  return std::tie(a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s);
+}
 #endif  // defined(__cpp_structured_bindings)
 
 template <size_t I, typename T>

googlemock/test/gmock-matchers-comparisons_test.cc

@@ -1720,6 +1720,11 @@ TEST(FieldsAreTest, StructuredBindings) {
   };
   EXPECT_THAT(MyVarType18{},
               FieldsAre(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0));
+  struct MyVarType19 {
+    int a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s;
+  };
+  EXPECT_THAT(MyVarType19{}, FieldsAre(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                                       0, 0, 0, 0, 0));
 }
 #endif