c - Is ((void*)0) a null pointer constant? - Stack Overflow
2014年10月21日 · Which implies, strictly speaking, that (void*)0 is a null pointer constant, but ((void*)0) is not. Then: I'm sure that most C implementations do treat a parenthesized null pointer constant as a null pointer constant, and define NULL either as 0, ((void*)0), or in some other manner. The two referenced sections say: § 6.3.2.3
javascript - What does `void 0` mean? - Stack Overflow
2012年12月5日 · Although undefined can generally be trusted in modern JavaScript environments, there is one trivial advantage of void 0: it's shorter. The difference is not enough to worry about when writing code but it can add up enough over large code bases that most code minifiers replace undefined with void 0 to reduce the number of bytes sent to the browser.
What does "javascript:void(0)" mean? - Stack Overflow
2009年8月18日 · Usage of javascript:void(0) means that the author of the HTML is misusing the anchor element in place of the button element. Anchor tags are often abused with the onclick event to create pseudo-buttons by setting href to "#" or "javascript:void(0)" to prevent the page from refreshing.
What does C expression ( (void (*) (void))0) (); mean?
2014年9月1日 · Said that ((void(*)(void))0)(); instruction is used to jump to 0 in firmwares usually. It is a bit improper because it actually calls in 0 instead of jumping to 0, but practically it won't make any difference (a fw hot reboot will be performed)
javascript - What is "void 0"? - Stack Overflow
2014年3月22日 · The void operator is often used merely to obtain the undefined primitive value, usually using “void(0)” (which is equivalent to “void 0”). In these cases, the global variable undefined can be used instead (assuming it has not been assigned to a non-default value).
JavaScript `undefined` vs `void 0` - Stack Overflow
2011年4月19日 · Where as void 0 is void 0 anywhere. Anyways, this technique will surely confuse the JITs which already optimize undefined (FF, Chrome but not IE10) because it's a global constant and even static analysis can see if it's shadowed. With this, you turn it into a normal variable look-up and it's not a compile-time constant for sure.
c++ - What is "void (0)"? - Stack Overflow
2024年12月13日 · Both void(0) and void{} are function-style explicit type conversion expressions in the standard, and the semantics are defined as follows, If the initializer is a parenthesized single expression, the type conversion expression is …
Can we call (void *)0 a void pointer in C? - Stack Overflow
2020年10月19日 · For example in int *ptr = (void*)0;, ptr is an int pointer, i.e. a pointer to int, regardless of the assignment, the same way that void *ptr = (void*)0; is a void pointer, i.e. a pointer to void, both these pointers value is 0 which makes them both null pointers. Read Lundin's comment bellow for interesting extra info about (void*)0.
Why is (void) 0 a no operation in C and C++? - Stack Overflow
2016年6月21日 · So I think all is clear: the definition of macro TRACE[#define TRACE ((void)0)] is illegal according to c++ syntax, but c++ compiler of visual studio supports this behavior as a compiler extension. So my conclusion is: [#define TRACE ((void)0)] is illegal c++ statement, and you at best DO NOT use this.
JavaScript: what does "void 0" mean? - Stack Overflow
2016年7月29日 · The void operator evaluates the given expression and then returns undefined. The void operator is often used merely to obtain the undefined primitive value, usually using “void(0)” (which is equivalent to “void 0”). In these cases, the global variable undefined can be used instead (assuming it has not been assigned to a non-default value).