47 lines · cpp
1// RUN: %clang_cc1 -fsyntax-only -std=c++2c -verify=expected,cxx26 %s2// RUN: %clang_cc1 -fsyntax-only -std=c++2b -verify=expected,cxx23 %s3 4 5struct S {};6struct T : S {} t;7 8consteval void test() {9 void* a = &t;10 const void* b = &t;11 volatile void* c = &t;12 (void)static_cast<T*>(a);13 (void)static_cast<const T*>(a);14 (void)static_cast<volatile T*>(a);15 16 (void)(T*)(a);17 (void)(const T*)(a);18 (void)(volatile T*)(a);19 20 (void)static_cast<T*>(b); // expected-error {{static_cast from 'const void *' to 'T *' casts away qualifiers}}21 (void)static_cast<volatile T*>(b); // expected-error {{static_cast from 'const void *' to 'volatile T *' casts away qualifiers}}22 (void)static_cast<const T*>(b);23 (void)static_cast<volatile const T*>(b);24 25 (void)static_cast<T*>(c); // expected-error{{static_cast from 'volatile void *' to 'T *' casts away qualifiers}}26 (void)static_cast<volatile T*>(c);27 (void)static_cast<const T*>(b);28 (void)static_cast<volatile const T*>(b);29}30 31void err() {32 constexpr void* a = &t;33 constexpr auto err1 = static_cast<int*>(a); // expected-error{{constexpr variable 'err1' must be initialized by a constant expression}} \34 // cxx23-note {{cast from 'void *' is not allowed in a constant expression in C++ standards before C++2c}} \35 // 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'}}36 constexpr auto err2 = static_cast<S*>(a); // expected-error{{constexpr variable 'err2' must be initialized by a constant expression}} \37 // cxx23-note {{cast from 'void *' is not allowed in a constant expression in C++ standards before C++2c}} \38 // 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'}}39}40 41int* p;42constexpr int** pp = &p;43constexpr void* vp = pp;44constexpr auto cvp = static_cast<const int* volatile*>(vp);45// cxx23-error@-1 {{constant expression}}46// cxx23-note@-2 {{cast from 'void *' is not allowed in a constant expression}}47