argument-passing | 易学教程

Performance when passing huge list as argument in recursive function?

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问题 I am using Python and I have a recursive function that takes a huge list as one of the arguments: # Current implementation def MyFunction(arg1, arg2, my_huge_list) ... ... MyFunction(new_arg1, new_arg2, my_huge_list) As you can see above, MyFunction is called recursively using the same list my_huge_list ; this doesn't change, unlike the other arguments. And, again, this list is huge. A friend of mine suggested that I could treat my_huge_list as a global variable to improve the performance, as

int foo (int argc, …) vs int foo() vs int foo(void) in C

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So today I figured (for the first time admittedly) that int foo() is in fact different from int foo(void) in that the first one allows any number of inputs and the second one allows zero . Does int foo() simply ignore any given inputs? If so, what's the point of allowing this form of function? If not, how can you access them and how is this different from having a variable argument list (e.g. something like int foo (int argc, ...) )? The key to understanding this is understanding the call stack. What happens when you call a function in C (with the standard x86 ABI — other platforms may vary)

Does Fortran intent(inout) pass a copy of the value, or pointer/reference to RAM address?

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问题 As title states I wish to know does Fortran intent(inout) pass a copy of the value, or a pointer/reference to RAM address? The reason I need to know this is I need to pass a (relatively) big data matrix. If it creates a local copy that would cause me problems. Thank you! 回答1: Fortran does not specify details of how function and subroutine arguments are passed, but it does require that if a procedure modifies an intent(out) or intent(inout) argument then the changes will be visible to the

Problems passing arguments with callNextMethod() in R

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My question: Why is callNextMethod() not passing arguments as expected to the next method? Situation: Say I have two hierarchical classes foo and bar ( bar is subclass of foo ) for which I have a method foobar that can dispatch for both classes (i.e., has methods for both classes). Furthermore, the method for the (sub)class bar calls the method for foo after some calculations with callNextMethod() . Both methods have the same additional argument (with default) that should be passed to the method for foo , where only it is relevant. setClass("foo", representation(x = "numeric")) setClass("bar",

Creating an array while passing it as an argument in Java

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Is there a way to create an array of objects as part of a constructor or method? I'm really not sure how to word this, so I've included an example. I have an enum, and one of the fields is an array of numbers. Here is what I tried: public enum KeyboardStuff { QWERTY(1, {0.5f, 1.3f, 23.1f}, 6); DVORAK(5, {0.1f, 0.2f, 4.3f, 1.1f}, 91); CHEROKEE(2, {22.0f}, 11); private int number, thingy; private float[] theArray; private KeyboardStuff(int i, float[] anArray, int j) { // do things } } The compiler says that the brackets { } are invalid and should be removed. Is there a way I can pass an array as

Pass Argument from VBS to VBA

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I try to call a VBA subroutine from VBS with passing a string variable from VBS to VBA, but can't find the appropiate syntax: 'VBS: '------------------------ Option Explicit Set ArgObj = WScript.Arguments Dim strPath mystr = ArgObj(0) '? 'Creating shell object Set WshShell = CreateObject("WScript.Shell") 'Creating File System Object Set objFSO = CreateObject("Scripting.FileSystemObject") 'Getting the Folder Object Set ObjFolder = objFSO.GetFolder(WshShell.CurrentDirectory) 'Getting the list of Files Set ObjFiles = ObjFolder.Files 'Creat a Word application object Set wdApp = CreateObject("Word

Can you call a servlet with a link?

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Can you call a servlet with a link? For example <a href="/servletName">link text</a> And possibly pass parameters to the request object by adding them to the querystring. If not, I have seen this kind of thing: RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(/MyServlet); dispatcher.include(request,response); But how would I trigger this? For example if it was JavaScript code I could put it within a jQuery click function, or if this was a servlet I would put it into a method. But how do I call this code from within a JSP. As far as I know you can't call Java code with

Elegant way to pass multiple arguments to a function

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问题 I've got a function which looks like this: bool generate_script (bool net, bool tv, bool phone, std::string clientsID, std::string password, int index, std::string number, std::string Iport, std::string sernoID, std::string VoiP_number, std::string VoiP_pass, std::string target, int slot, int port, int onu, int extra, std::string IP, std::string MAC); In my opinion it looks ugly. What is the proper way of handling this problem? Should I create few vectors with different data types (int,

javascript: pass an object as the argument to a onclick function inside string

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I would like to pass an object as parameter to an Onclick function inside a string. Something like follwing: function myfunction(obj,parentobj){ var o=document.createElement("div"); o.innerHTML='<input type="button" onclick="somelistener(' + obj + ')" />'; parentobj.appendChild(o.firstChild); } Obviously, this doesn't work. Anyone has any idea? THX! A more complete version, as suggested by @Austin <!DOCTYPE html> <html> <body> <style type="text/css"> </style> <p id="test">test</p> <p id="objectid"></p> <script> function test(s){ document.getElementById("test").innerHTML+=s; } function

Passing arguments django signals - post_save/pre_save

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I am working on a notification app in Django 1.6 and I want to pass additional arguments to Django signals such as post_save . I tried to use partial from functools but no luck. from functools import partial post_save.connect( receiver=partial(notify, fragment_name="categories_index"), sender=nt.get_model(), dispatch_uid=nt.sender ) notify function has a keyword argument fragment_name which I want to pass as default in my signals. Any suggestions? Daniel Rucci Your attempt with partial isn't working because by default these receivers are connected using a weak reference. According to the