to a previously defined class type or a“pointer to void”. The type of expression must be a pointer if type-id is a pointer, or an l-value if type-id is a reference. static_cast Operator The expression static_cast < type-id > ( expression ) converts expression to the type of typ...
Clang supports indirect call Control-Flow Integrity (CFI) sanitizers (e.g. -fsanitize=cfi-icall), which enforce an exact type match between a function pointer and the target function. Unfortunately, Clang doesn't provide diagnostics that would help developers avoid function type casts that lead...
The expressionreinterpret_cast<T>(v)changes the interpretation of the value of the expressionv. It can be used to convert between pointer and integer types, between unrelated pointer types, between pointer-to-member types, and between pointer-to-function types. Usage of thereinterpret_castoperator...
(p1==&i);// pointer to function to another and backvoid(*fp1)()=reinterpret_cast<void(*)()>(f);// fp1(); undefined behaviorint(*fp2)()=reinterpret_cast<int(*)()>(fp1);std::cout<<std::dec<<fp2()<<'\n';// safe// type aliasing through pointerchar*p2=reinterpret_cast<char...
The type of expression must be a pointer if type-id is a pointer, or an l-value if type-id is a reference.See static_cast for an explanation of the difference between static and dynamic casting conversions, and when it's appropriate to use each....
When casting between pointers (either object or function), if the original value is a null pointer value of its type, the result is the correct null pointer value for the target type. In any case (both when executing an implicit conversion and in the same-type cast), ifexpressionandtype-...
4)null pointer value may be converted to the null pointer value ofnew_type As with all cast expressions, the result is: an lvalue ifnew_typeis an lvalue reference type or an rvalue reference to function type; an xvalue ifnew_typeis an rvalue reference to object type; ...
to be sufficient to silence the diagnostic. This is similar to+// how we allow casts between function pointers and void * for supporting+// dlsym.+// Note: we could check for __stdcall on the function pointer as well, but+// that seems like splitting hairs.+if (!T->getReturnType(...
10function(static_cast(b)可以通过而function(static(c))不能通过编译,因为在编译的时候编译器已经知道c和a的类型不符,因此static_cast可以保证安全。11下面我们骗一下编译器,先把c转成类型a12b& ref_b = reinterpret_castc;13然后function(static_cast(ref_b))就通过了!因为从编译器的角度来看,在编译时并...
输出结果是:Null pointer on second type-cast 两个dynamic_cast都是下行转换,第一个转换是安全的,因为指向对象的本质是子类,转换的结果使子类指针指向子类,天经地义;第二个转换是不安全的,因为指向对象的本质是父类,“指鹿为马”或指向不存在的空间很可能发生!