diff options
Diffstat (limited to 'test/SemaCXX/static-cast.cpp')
-rw-r--r-- | test/SemaCXX/static-cast.cpp | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/test/SemaCXX/static-cast.cpp b/test/SemaCXX/static-cast.cpp new file mode 100644 index 0000000..8399e77 --- /dev/null +++ b/test/SemaCXX/static-cast.cpp @@ -0,0 +1,129 @@ +// RUN: clang-cc -fsyntax-only -verify %s + +struct A {}; +struct B : public A {}; // Single public base. +struct C1 : public virtual B {}; // Single virtual base. +struct C2 : public virtual B {}; +struct D : public C1, public C2 {}; // Diamond +struct E : private A {}; // Single private base. +struct F : public C1 {}; // Single path to B with virtual. +struct G1 : public B {}; +struct G2 : public B {}; +struct H : public G1, public G2 {}; // Ambiguous path to B. + +enum Enum { En1, En2 }; +enum Onom { On1, On2 }; + +// Explicit implicits +void t_529_2() +{ + int i = 1; + (void)static_cast<float>(i); + double d = 1.0; + (void)static_cast<float>(d); + (void)static_cast<int>(d); + (void)static_cast<char>(i); + (void)static_cast<unsigned long>(i); + (void)static_cast<int>(En1); + (void)static_cast<double>(En1); + (void)static_cast<int&>(i); + (void)static_cast<const int&>(i); + + int ar[1]; + (void)static_cast<const int*>(ar); + (void)static_cast<void (*)()>(t_529_2); + + (void)static_cast<void*>(0); + (void)static_cast<void*>((int*)0); + (void)static_cast<volatile const void*>((const int*)0); + (void)static_cast<A*>((B*)0); + (void)static_cast<A&>(*((B*)0)); + (void)static_cast<const B*>((C1*)0); + (void)static_cast<B&>(*((C1*)0)); + (void)static_cast<A*>((D*)0); + (void)static_cast<const A&>(*((D*)0)); + (void)static_cast<int B::*>((int A::*)0); + (void)static_cast<void (B::*)()>((void (A::*)())0); + + // TODO: User-defined conversions + + // Bad code below + + (void)static_cast<void*>((const int*)0); // expected-error {{static_cast from 'int const *' to 'void *' is not allowed}} + //(void)static_cast<A*>((E*)0); // {{static_cast from 'struct E *' to 'struct A *' is not allowed}} + //(void)static_cast<A*>((H*)0); // {{static_cast from 'struct H *' to 'struct A *' is not allowed}} + (void)static_cast<int>((int*)0); // expected-error {{static_cast from 'int *' to 'int' is not allowed}} + (void)static_cast<A**>((B**)0); // expected-error {{static_cast from 'struct B **' to 'struct A **' is not allowed}} + (void)static_cast<char&>(i); // expected-error {{non-const lvalue reference to type 'char' cannot be initialized with a value of type 'int'}} +} + +// Anything to void +void t_529_4() +{ + static_cast<void>(1); + static_cast<void>(t_529_4); +} + +// Static downcasts +void t_529_5_8() +{ + (void)static_cast<B*>((A*)0); + (void)static_cast<B&>(*((A*)0)); + (void)static_cast<const G1*>((A*)0); + (void)static_cast<const G1&>(*((A*)0)); + + // Bad code below + + (void)static_cast<C1*>((A*)0); // expected-error {{cannot cast 'struct A *' to 'struct C1 *' via virtual base 'struct B'}} + (void)static_cast<C1&>(*((A*)0)); // expected-error {{cannot cast 'struct A' to 'struct C1 &' via virtual base 'struct B'}} + (void)static_cast<D*>((A*)0); // expected-error {{cannot cast 'struct A *' to 'struct D *' via virtual base 'struct B'}} + (void)static_cast<D&>(*((A*)0)); // expected-error {{cannot cast 'struct A' to 'struct D &' via virtual base 'struct B'}} + (void)static_cast<B*>((const A*)0); // expected-error {{static_cast from 'struct A const *' to 'struct B *' casts away constness}} + (void)static_cast<B&>(*((const A*)0)); // expected-error {{static_cast from 'struct A const' to 'struct B &' casts away constness}} + // Accessibility is not yet tested + //(void)static_cast<E*>((A*)0); // {{static_cast from 'struct A *' to 'struct E *' is not allowed}} + //(void)static_cast<E&>(*((A*)0)); // {{static_cast from 'struct A' to 'struct E &' is not allowed}} + (void)static_cast<H*>((A*)0); // expected-error {{ambiguous static_cast from base 'struct A' to derived 'struct H':\n struct A -> struct B -> struct G1 -> struct H\n struct A -> struct B -> struct G2 -> struct H}} + (void)static_cast<H&>(*((A*)0)); // expected-error {{ambiguous static_cast from base 'struct A' to derived 'struct H':\n struct A -> struct B -> struct G1 -> struct H\n struct A -> struct B -> struct G2 -> struct H}} + (void)static_cast<E*>((B*)0); // expected-error {{static_cast from 'struct B *' to 'struct E *' is not allowed}} + (void)static_cast<E&>(*((B*)0)); // expected-error {{non-const lvalue reference to type 'struct E' cannot be initialized with a value of type 'struct B'}} + + // TODO: Test inaccessible base in context where it's accessible, i.e. + // member function and friend. + + // TODO: Test DR427. This requires user-defined conversions, though. +} + +// Enum conversions +void t_529_7() +{ + (void)static_cast<Enum>(1); + (void)static_cast<Enum>(1.0); + (void)static_cast<Onom>(En1); + + // Bad code below + + (void)static_cast<Enum>((int*)0); // expected-error {{static_cast from 'int *' to 'enum Enum' is not allowed}} +} + +// Void pointer to object pointer +void t_529_10() +{ + (void)static_cast<int*>((void*)0); + (void)static_cast<const A*>((void*)0); + + // Bad code below + + (void)static_cast<int*>((const void*)0); // expected-error {{static_cast from 'void const *' to 'int *' casts away constness}} + (void)static_cast<void (*)()>((void*)0); // expected-error {{static_cast from 'void *' to 'void (*)(void)' is not allowed}} +} + +// Member pointer upcast. +void t_529_9() +{ + (void)static_cast<int A::*>((int B::*)0); + + // Bad code below + (void)static_cast<int A::*>((int H::*)0); // expected-error {{ambiguous conversion from pointer to member of derived class 'struct H'}} + (void)static_cast<int A::*>((int F::*)0); // expected-error {{conversion from pointer to member of class 'struct F'}} +} |