function

问题 For a university exercise, I have been asked to write a template function "print();", which takes two arguments, 1: an array of a generic type, and 2: an int specifying the size of the array. The function should then print out every item in the array to the console. I am having some trouble with the function arguments. The code I currently have is: template <typename Type> Type print (Type a, Type b) { Type items; Type array; a = array; b = items; for (int i = 0; i < items; i++) { std::cout <

问题 val m = scala.collection.mutable.Map[String, Int]() // this doesn't work m += ("foo", 2) // this does work m += (("foo", 2)) // this works too val barpair = ("bar", 3) m += barpair So what's the deal with m += ("foo" , 2) not working? Scala gives the type error: error: type mismatch; found : java.lang.String("foo") required: (String, Int) m += ("foo", 2) ^ Apparently Scala thinks that I am trying to call += with two arguments, instead of one tuple argument. Why? Isn't it unambiguous, since I

问题 I frequently use the msdb.dbo.sp_send_dbmail tool in SQL Server for automated reports and such but I've never really used it to for an update/delete type statement in the @query section. Is it possible to do so? When I run this query, it gives 0 results and doesn't execute the actual Merge and Delete function within the @query section. I'm running a test scenario where I know there should be results, and that it should be deleted but no dice. Any advice appreciated as I may be missing

问题 I am very familiar with C/C++ standard function declarations. I've recently seen something like this: int myfunction(char parameter) const The above is only a hypothetical example and I don't even know if it makes sense. I'm referring to the part AFTER the parameter. The const. What is this? A more real example: wxGridCellCoordsArray GetSelectedCells() const This can be found here So what exactly is that text const doing at the end of the line? 回答1: The const keyword, when shown after a

问题 I am very familiar with C/C++ standard function declarations. I've recently seen something like this: int myfunction(char parameter) const The above is only a hypothetical example and I don't even know if it makes sense. I'm referring to the part AFTER the parameter. The const. What is this? A more real example: wxGridCellCoordsArray GetSelectedCells() const This can be found here So what exactly is that text const doing at the end of the line? 回答1: The const keyword, when shown after a

问题 I am very familiar with C/C++ standard function declarations. I've recently seen something like this: int myfunction(char parameter) const The above is only a hypothetical example and I don't even know if it makes sense. I'm referring to the part AFTER the parameter. The const. What is this? A more real example: wxGridCellCoordsArray GetSelectedCells() const This can be found here So what exactly is that text const doing at the end of the line? 回答1: The const keyword, when shown after a

问题 I'm interested in counting a number of arguments passed to a function. length can't be used for that purpose: >> length(2,2,2,2,2) Error in length(2, 2, 2, 2, 2) : 5 arguments passed to 'length' which requires 1 This is obvious as length takes 1 argument so: length(c(2,2,2,2,2)) would produce the desired result - 5. Solution I want to call my function like that myFunction(arg1, arg2, arg3) . This can be done with use of an ellipsis: myCount <- function(...) {length(list(...))} myCount would

问题 How would I Find all values by specific key in a deep nested object? For example, if I have an object like this: const myObj = { id: 1, children: [ { id: 2, children: [ { id: 3 } ] }, { id: 4, children: [ { id: 5, children: [ { id: 6, children: [ { id: 7, } ] } ] } ] }, ] } How would I get an array of all values throughout all nests of this obj by the key of id . Note: children is a consistent name, and id 's wont exist outside of a children object. So from the obj, I would like to produce an

问题 There are two elements in a module manifest: cmdlet and function. What is the difference between a cmdlet and a function? 回答1: A cmdlet is a .NET class written in C# or other .NET language and contained in a .dll (i.e. in a binary module). A function is specified directly in PowerShell in a script, script module or at the command line. A module manifest may include both script and binary modules so the manifest needs to be able to export both cmdlets and functions. It's even possible to have

问题 I am attempting to create a simple priority based scheduler in XV6. To do this, I also have to create a system call that will allow a process to set its priority. I have done everything required to create the system call as discussed here and elsewhere: how do i add a system call / utility in xv6 The problem is, I cannot pass any variables when I call the function, or rather, it runs like nothing is wrong but the correct values do not show up inside the function. Extern declaration (syscall.c