parameter-passing

问题 A web application can send to a function an array of arrays like [ [ [1,2], [3,4] ], [ [], [4,5,6] ] ] The outer array length is n > 0 . The middle arrays are of constant length, 2 in this example. And the inner arrays lengths are n >= 0 . I could string build it like this: with t(a, b) as ( values (1, 4), (2, 3), (1, 4), (7, 3), (7, 4) ) select distinct a, b from t where (a = any(array[1,2]) or array_length(array[1,2],1) is null) and (b = any(array[3,4]) or array_length(array[3,4],1) is null

问题 I am calling valueChangeListener on a <h:selectBooleanCheckbox> which is inside a dataTable. and that dataTable is again inside another(outer) dataTable. In the valueChangeListener method I want the instance object of outer dataTable. Is there any way to get the object of outer dataTable instance? EX: <h:panelGroup id="panelId"> <p:dataTable id="outerDatatable" var="supplier" value="bean.supplierList"> <p:column> <f:facet name="header"> <h:outputText value="Suppliers" /> </f:facet> <h

问题 Quick question about JavaScript event objects - how does JavaScript know when I'm trying to pass an event variable to a function? For example, when I define an onclick handler like so: <button onclick='SendMessage(event)'></button> does JavaScript pass the event variable just because I named it "event"? If so, what other variable names does it reserve for the purpose of passing event variables? (e? ev? etc..) If this is the case, can they be covered by naming local or global variables "event"

问题 Can anyone help me out understanding the various parameter passing modes in Scheme? I know Scheme implements parameter passing by value. But how about other modes? Is there any good documentation for parameter passing in Scheme? 回答1: Scheme has only call-by-value function calls. There are other alternatives that can be implemented within the language, but if you're a beginner then it's best to not even try them at this point. If you're looking for a way to pass values "by reference" -- then

问题 In my code, I have a subroutine that takes a 5th-rank array as argument and uses a local variable, which is a 4-th rank array sharing the first 4 indices. I'm trying to find a more concise way to express the size declaration in subroutine mysub(momentum) complex, intent(in) :: momentum(:,:,:,:,:) complex :: prefactor( & & size(momentum,1), size(momentum,2), size(momentum,4) & & size(momentum,5) ) ... end subroutine mysub The verbosity of the size declaration harms readability, especially when

问题 I am having trouble creating a custom module for my Magento store. I have successfully added a route (/landing), and created/layout files that display template content within my base layout. I now need to move beyond that a bit. I want to be able to load a parameter from a URL, grab an object based on that parameter, and display things based on the contents of my object. Example: User browsers to domain.com/landing/cool/. This (hopefully) would call the landing controller. Controller would

问题 I'd like to create a function "lazy" which accepts a function with an undetermined number of arguments as parameter. What type do I need or which casts have to be done? Then I want to execute that thing later in function "evaluate". How do I then pass the arguments I passed before to the "lazy" function to the passed function pointer? Some code to illustrate my problem: char *function_I_want_to_call(void *foo, type bar, ...); // the arguments are unknown to lazy() and evaluate() typedef

问题 I'm a beginner to Swift and I'm trying to initiate a function through NotificationCenter. The observer in 'ViewController.swift' calls on function reload : override func viewDidLoad() { super.viewDidLoad() NotificationCenter.default.addObserver(self, selector: #selector(reload), name: NSNotification.Name(rawValue: "reload"), object: nil) } func reload(target: Item) { print(target.name) print(target.iconName) } ... which has a parameter of class Ítem : class Item: NSObject { let name: String

问题 I was wondering. Are there languages that use only pass-by-reference as their eval strategy? 回答1: I don't know what an "eval strategy" is, but Perl subroutine calls are pass-by-reference only. sub change { $_[0] = 10; } $x = 5; change($x); print $x; # prints "10" change(0); # raises "Modification of a read-only value attempted" error 回答2: VB (pre .net), VBA & VBS default to ByRef although it can be overriden when calling/defining the sub or function. 回答3: How about Brainfuck? 回答4: FORTRAN

问题 I'm trying to use the /D parameter of the Inno Setup Command Line Compiler to choose which files should be included in my setup. The code looks like the following: #define MyAppName "MyApp" #define MyAppVersion "1.0.0" (....) #define PHASE [Setup] AppVersion={#MyAppVersion} (....) [Files] Source: "C:\temp\myfile.txt"; DestDir: "{app}"; #if PHASE == "test" Source: "C:\temp\onlyInTestBuildNeeded.txt"; DestDir: "{app}"; #endif I try to compile the script ISCC /DPHASE=test "D:\foo\bar.iss" but it