| // RUN: %check_clang_tidy %s cppcoreguidelines-pro-type-static-cast-downcast %t |
| |
| class Base { |
| }; |
| |
| class Derived : public Base { |
| }; |
| |
| class Base2 { |
| }; |
| |
| class MultiDerived : public Base, public Base2 { |
| }; |
| |
| class PolymorphicBase { |
| public: |
| virtual ~PolymorphicBase(); |
| }; |
| |
| class PolymorphicDerived : public PolymorphicBase { |
| }; |
| |
| class PolymorphicMultiDerived : public Base, public PolymorphicBase { |
| }; |
| |
| void pointers() { |
| |
| auto P0 = static_cast<Derived*>(new Base()); |
| // CHECK-MESSAGES: :[[@LINE-1]]:13: warning: do not use static_cast to downcast from a base to a derived class [cppcoreguidelines-pro-type-static-cast-downcast] |
| |
| const Base* B0; |
| auto PC0 = static_cast<const Derived*>(B0); |
| // CHECK-MESSAGES: :[[@LINE-1]]:14: warning: do not use static_cast to downcast from a base to a derived class [cppcoreguidelines-pro-type-static-cast-downcast] |
| |
| auto P1 = static_cast<Base*>(new Derived()); // OK, upcast to a public base |
| auto P2 = static_cast<Base*>(new MultiDerived()); // OK, upcast to a public base |
| auto P3 = static_cast<Base2*>(new MultiDerived()); // OK, upcast to a public base |
| } |
| |
| void pointers_polymorphic() { |
| |
| auto PP0 = static_cast<PolymorphicDerived*>(new PolymorphicBase()); |
| // CHECK-MESSAGES: :[[@LINE-1]]:14: warning: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast] |
| // CHECK-FIXES: auto PP0 = dynamic_cast<PolymorphicDerived*>(new PolymorphicBase()); |
| |
| const PolymorphicBase* B0; |
| auto PPC0 = static_cast<const PolymorphicDerived*>(B0); |
| // CHECK-MESSAGES: :[[@LINE-1]]:15: warning: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast] |
| // CHECK-FIXES: auto PPC0 = dynamic_cast<const PolymorphicDerived*>(B0); |
| |
| |
| auto B1 = static_cast<PolymorphicBase*>(new PolymorphicDerived()); // OK, upcast to a public base |
| auto B2 = static_cast<PolymorphicBase*>(new PolymorphicMultiDerived()); // OK, upcast to a public base |
| auto B3 = static_cast<Base*>(new PolymorphicMultiDerived()); // OK, upcast to a public base |
| } |
| |
| void arrays() { |
| Base ArrayOfBase[10]; |
| auto A0 = static_cast<Derived*>(ArrayOfBase); |
| // CHECK-MESSAGES: :[[@LINE-1]]:13: warning: do not use static_cast to downcast from a base to a derived class [cppcoreguidelines-pro-type-static-cast-downcast] |
| } |
| |
| void arrays_polymorphic() { |
| PolymorphicBase ArrayOfPolymorphicBase[10]; |
| auto AP0 = static_cast<PolymorphicDerived*>(ArrayOfPolymorphicBase); |
| // CHECK-MESSAGES: :[[@LINE-1]]:14: warning: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead |
| // CHECK-FIXES: auto AP0 = dynamic_cast<PolymorphicDerived*>(ArrayOfPolymorphicBase); |
| } |
| |
| void references() { |
| Base B0; |
| auto R0 = static_cast<Derived&>(B0); |
| // CHECK-MESSAGES: :[[@LINE-1]]:13: warning: do not use static_cast to downcast from a base to a derived class [cppcoreguidelines-pro-type-static-cast-downcast] |
| Base& RefToBase = B0; |
| auto R1 = static_cast<Derived&>(RefToBase); |
| // CHECK-MESSAGES: :[[@LINE-1]]:13: warning: do not use static_cast to downcast from a base to a derived class [cppcoreguidelines-pro-type-static-cast-downcast] |
| |
| const Base& ConstRefToBase = B0; |
| auto RC1 = static_cast<const Derived&>(ConstRefToBase); |
| // CHECK-MESSAGES: :[[@LINE-1]]:14: warning: do not use static_cast to downcast from a base to a derived class [cppcoreguidelines-pro-type-static-cast-downcast] |
| |
| |
| Derived RD1; |
| auto R2 = static_cast<Base&>(RD1); // OK, upcast to a public base |
| } |
| |
| void references_polymorphic() { |
| PolymorphicBase B0; |
| auto RP0 = static_cast<PolymorphicDerived&>(B0); |
| // CHECK-MESSAGES: :[[@LINE-1]]:14: warning: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead |
| // CHECK-FIXES: auto RP0 = dynamic_cast<PolymorphicDerived&>(B0); |
| |
| PolymorphicBase& RefToPolymorphicBase = B0; |
| auto RP1 = static_cast<PolymorphicDerived&>(RefToPolymorphicBase); |
| // CHECK-MESSAGES: :[[@LINE-1]]:14: warning: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast] |
| // CHECK-FIXES: auto RP1 = dynamic_cast<PolymorphicDerived&>(RefToPolymorphicBase); |
| |
| const PolymorphicBase& ConstRefToPolymorphicBase = B0; |
| auto RPC2 = static_cast<const PolymorphicDerived&>(ConstRefToPolymorphicBase); |
| // CHECK-MESSAGES: :[[@LINE-1]]:15: warning: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast] |
| // CHECK-FIXES: auto RPC2 = dynamic_cast<const PolymorphicDerived&>(ConstRefToPolymorphicBase); |
| |
| PolymorphicDerived d1; |
| auto RP2 = static_cast<PolymorphicBase&>(d1); // OK, upcast to a public base |
| } |
| |
| template<class B, class D> |
| void templ() { |
| auto B0 = static_cast<B*>(new D()); |
| } |
| |
| void templ_bad_call() { |
| templ<Derived, Base>(); //FIXME: this should trigger a warning |
| } |
| |
| void templ_good_call() { |
| templ<Base, Derived>(); // OK, upcast to a public base |
| } |