| // RUN: %clang_cc1 -fsyntax-only -std=c++2c -verify=expected,cxx26 %s |
| // RUN: %clang_cc1 -fsyntax-only -std=c++2b -verify=expected,cxx23 %s |
| |
| |
| struct S {}; |
| struct T : S {} t; |
| |
| consteval void test() { // cxx23-error{{consteval function never produces a constant expression}} |
| void* a = &t; |
| const void* b = &t; |
| volatile void* c = &t; |
| (void)static_cast<T*>(a); //cxx23-note {{cast from 'void *' is not allowed in a constant expression in C++ standards before C++2c}} |
| (void)static_cast<const T*>(a); |
| (void)static_cast<volatile T*>(a); |
| |
| (void)(T*)(a); |
| (void)(const T*)(a); |
| (void)(volatile T*)(a); |
| |
| (void)static_cast<T*>(b); // expected-error {{static_cast from 'const void *' to 'T *' casts away qualifiers}} |
| (void)static_cast<volatile T*>(b); // expected-error {{static_cast from 'const void *' to 'volatile T *' casts away qualifiers}} |
| (void)static_cast<const T*>(b); |
| (void)static_cast<volatile const T*>(b); |
| |
| (void)static_cast<T*>(c); // expected-error{{static_cast from 'volatile void *' to 'T *' casts away qualifiers}} |
| (void)static_cast<volatile T*>(c); |
| (void)static_cast<const T*>(b); |
| (void)static_cast<volatile const T*>(b); |
| } |
| |
| void err() { |
| constexpr void* a = &t; |
| constexpr auto err1 = static_cast<int*>(a); // expected-error{{constexpr variable 'err1' must be initialized by a constant expression}} \ |
| // cxx23-note {{cast from 'void *' is not allowed in a constant expression in C++ standards before C++2c}} \ |
| // cxx26-note {{cast from 'void *' is not allowed in a constant expression because the pointed object type 'T' is not similar to the target type 'int'}} |
| constexpr auto err2 = static_cast<S*>(a); // expected-error{{constexpr variable 'err2' must be initialized by a constant expression}} \ |
| // cxx23-note {{cast from 'void *' is not allowed in a constant expression in C++ standards before C++2c}} \ |
| // cxx26-note {{cast from 'void *' is not allowed in a constant expression because the pointed object type 'T' is not similar to the target type 'S'}} |
| } |