void

问题 I haven't found anything with the specific needs of my function to do this, yes, it is for homework. So I have: public void reverseArray(int[] x) { } Precondition: x.length > 0 The fact that I can't have the function return anything, and the only argument is an array is leaving me stumped. I've tried using loops along with the recursion, but everything I've tried seems to end up with infinite instances of the function being made. I've gotten an idea/suggestion to use another function along

问题 I haven't found anything with the specific needs of my function to do this, yes, it is for homework. So I have: public void reverseArray(int[] x) { } Precondition: x.length > 0 The fact that I can't have the function return anything, and the only argument is an array is leaving me stumped. I've tried using loops along with the recursion, but everything I've tried seems to end up with infinite instances of the function being made. I've gotten an idea/suggestion to use another function along

问题 Apparently, it is possible to declare a function returning const void : const void foo() { } g++ seems to consider the const important, because the following code does not compile: #include <type_traits> static_assert(std::is_same<void(), const void()>::value, "const matters"); So does const void have any practical significance? 回答1: Not really. But to ignore cv -qualifications on void or to make them errors could create unnecessary complexity in terms of both compiler implementation and end

问题 gcc-4.8 accepts this code, but isn't it wrong since the non-type parameter pack is equivalent to void... which is illegal? template <typename T, typename std::enable_if<std::is_integral<T>::value>::type...> void test(T) {} I tried this with clang-3.5 as well which also accepts it. Is this a compiler bug, or am I misunderstanding something? Full test code below, which uses non-type empty parameter packs to simplify enable_if. This is almost the same as what's in Flaming Dangerzone's Remastered

问题 Question : Are there any possible explicit uses for the empty tuple () , as a value (and not as a type) in Swift 2.x? I know that these empty tuples can be used in the standard sense to define void functions. When I mistakenly defined a variable with a empty tuple value var a = () (of type () ), I started wondering if these empty tuple values can be used in some context. Does anyone know of such an application? Example: possible application with array and optionals? As an example, we can

问题 Due to the use of Generics in Java I ended up in having to implement a function having Void as return type: public Void doSomething() { //... } and the compiler demands that I return something . For now I'm just returning null , but I'm wondering if that is good coding practice... I'm asking about V ‌oid, not v ‌oid. The class Void , not the reserved keyword void . I've also tried Void.class , void , Void.TYPE , new Void() , no return at all, but all that doesn't work at all. (For more or

问题 How can we declare a void pointer in C#? 回答1: void* identifier; as described here But it needs to be in unsafe as: unsafe { void* identifier; } And unsafe code has to have been allowed for the project. 回答2: I'm assuming you mean in managed code, as your question is rather short to do anything but assume. I think you're either looking for IntPtr or simply any object reference (which is the base type, and the basic equivalent of a null pointer - a reference to "something"). Unless you mean null

问题 This question already has answers here : What should main() return in C and C++? (17 answers) Closed 3 years ago . I am a beginner in C language. Can anyone explain in detail using example how main(),int main(), void main(), main(void), void main(void), int main(void) work in C language? As in what is happeneing when we use void main() and what is happening when i use int main() in simple language and so on. I know but cant understand what is it doing: main() - function has no arguments int

问题 This question already has answers here : Uses for the Java Void Reference Type? (11 answers) Closed 5 years ago . I am not clear with the class java.lang.Void in Java. Can anybody elaborate in this with an example. 回答1: It also contains Void.TYPE , useful for testing return type with reflection: public void foo() {} ... if (getClass().getMethod("foo").getReturnType() == Void.TYPE) ... 回答2: Say you want to have a generic that returns void for something: abstract class Foo<T> { abstract T bar()

问题 I have a method that returns void in a class that is a dependency of the class I want to test. This class is huge and I'm only using this single method from it. I need to replace the implementation of this method for the test as I want it to do something different and I need to be able to access the parameters this method receives. I cannot find a way of doing this in EasyMock. I think I know how to do it with Mockito by using doAnswer but I don't want to add another library unless absolutely