2012年7月24日 · This also works for C language. The void type of pointer is a special type of pointer. In C++, void represents the absence of type, so void pointers are pointers that point to a value that has no type (and thus also an undetermined length and …

2009年6月25日 · Void* is a bit funnier. I don't think the C designers thought of void in the above way; they just created a keyword. That keyword was available when somebody needed a point to an arbitrary type, thus void* as the idiom in C. It actually works pretty well if you interpret void as an empty structure.

2011年3月23日 · int register_callback(void (*foo)(void *baz), void *bar); register_callback is called with a pointer to a void function that expects as parameter a pointer that presumably means something to it. At some (unspecified) time in the future, that …

2011年11月6日 · void is an incomplete type that cannot be completed. That means that an expression of type void can only be used in a context that doesn't expect a value. And you're right, an expression of type void cannot be used as an lvalue or rvalue. EDIT: Except in the case Alf described, and only in C++.

Is it possible to dereference the void pointer without type-casting in C programming language... No, void indicates the absence of type, it is not something you can dereference or assign to. is there is any way of generalizing a function which can receive pointer and store it in void pointer and by using that void pointer we can make a ...

2015年11月9日 · Ponteiros void* precedem C++ e templates como um mecanismo para lidar com tipos "genéricos" em C. Para ser mais específico void representa a ausência de tipo, que pode ser entendida como a presença de qualquer tipo.

2010年8月15日 · The C Standard says that void is an incomplete type that cannot be completed (unlike other incomplete types that can be completed). This means you cannot apply the sizeof operator to void , but you can have a pointer to an incomplete type.

As this is C, you cannot pass the pointer by reference without passing in a pointer to the pointer (e.g., void ** rather than void * to point to the pointer). You need to return the new pointer. You need to return the new pointer.

I am trying to use a double void pointer but I am a little bit confused about the usage. I have a struct that contains a void ** array. struct Thing{ void ** array; }; struct Thing * c = mal...

Para c y c++ es cierto que void prácticamente significa nada, pero agregandole un simple asterisco (*), puede ser todo o, mejor dicho, ¡Lo que sea! Empezando por partes, la palabra reservada void tiene los siguientes casos de usos en C (Entre otros): Especificador de tipo: void HacerAlgoQueNoRetorna(void);