Fixed #9679 (False positive: use this after free (lambda not executed directly))

lib/checkclass.cpp

@@ -2699,9 +2699,12 @@ bool CheckClass::checkThisUseAfterFreeRecursive(const Scope *classScope, const F
         } else if (isDestroyed && Token::Match(tok->previous(), "!!. %name%") && tok->variable() && tok->variable()->scope() == classScope && !tok->variable()->isStatic() && !tok->variable()->isArgument()) {
             thisUseAfterFree(selfPointer->nameToken(), *freeToken, tok);
             return true;
-        } else if (*freeToken && Token::Match(tok, "return|throw"))
+        } else if (*freeToken && Token::Match(tok, "return|throw")) {
             // TODO
             return tok->str() == "throw";
+        } else if (tok->str() == "{" && tok->scope()->type == Scope::ScopeType::eLambda) {
+            tok = tok->link();
+        }
     }
     return false;
 }

test/testclass.cpp

@@ -7306,6 +7306,22 @@ private:
                               "\n"
                               "C* C::instanceSingleton;");
         ASSERT_EQUALS("", errout.str());
+
+        // Avoid false positive when pointer is deleted in lambda
+        checkThisUseAfterFree("class C {\n"
+                              "public:\n"
+                              "    void foo();\n"
+                              "    void set() { p = this; }\n"
+                              "    void dostuff() {}\n"
+                              "    C* p;\n"
+                              "};\n"
+                              "\n"
+                              "void C::foo() {\n"
+                              "    auto done = [this] () { delete p; };\n"
+                              "    dostuff();\n"
+                              "    done();\n"
+                              "}");
+        ASSERT_EQUALS("", errout.str());
     }
 };