内核优化

Kernel/tests/renderive/state/Double_State_Strategy_Test.cpp

@@ -76,3 +76,38 @@ TEST(double_state_strategy_test, notifies_observer_for_cache_update_and_publish)
     EXPECT_EQ(recorder.data->publish_count, 1);
     EXPECT_EQ(recorder.data->value, 8);
 }
+struct Double_State_Throwing_Assignment_State {
+    int first{};
+    int second{};
+    Double_State_Throwing_Assignment_State() = default;
+    Double_State_Throwing_Assignment_State(int first, int second) : first(first), second(second) {}
+    Double_State_Throwing_Assignment_State(const Double_State_Throwing_Assignment_State&) = default;
+    Double_State_Throwing_Assignment_State(Double_State_Throwing_Assignment_State&&) noexcept = default;
+    Double_State_Throwing_Assignment_State& operator=(const Double_State_Throwing_Assignment_State& other) {
+        first = other.first;
+        if (throw_on_copy_assignment) {
+            throw std::runtime_error("state assignment failed");
+        }
+        second = other.second;
+        return *this;
+    }
+    Double_State_Throwing_Assignment_State& operator=(Double_State_Throwing_Assignment_State&&) noexcept = default;
+    inline static bool throw_on_copy_assignment{};
+};
+TEST(double_state_strategy_test, failed_publish_keeps_render_state_and_revision_unchanged) {
+    using Strategy = Double_State_Strategy<State_Plain_Base, Double_State_Throwing_Assignment_State>;
+    Double_State_Throwing_Assignment_State::throw_on_copy_assignment = false;
+    Strategy strategy(Double_State_Throwing_Assignment_State(1, 2));
+    strategy.set<&Double_State_Throwing_Assignment_State::first>(10);
+    strategy.set<&Double_State_Throwing_Assignment_State::second>(20);
+    Double_State_Throwing_Assignment_State::throw_on_copy_assignment = true;
+    EXPECT_THROW(strategy.publish(), std::runtime_error);
+    Double_State_Throwing_Assignment_State::throw_on_copy_assignment = false;
+    EXPECT_EQ(strategy.state_revision(), 0);
+    EXPECT_EQ(strategy.render_use_state().first, 1);
+    EXPECT_EQ(strategy.render_use_state().second, 2);
+    strategy.publish();
+    EXPECT_EQ(strategy.state_revision(), 1);
+    EXPECT_EQ(strategy.render_use_state().first, 10);
+    EXPECT_EQ(strategy.render_use_state().second, 20);
+}