scope

What is the scope of a literal value, and how does the compiler allocate memory to it?

由 喜你入骨 提交于 2019-12-07 17:49:17
问题 int x = 12; 12 is said to be integer literal, and therefore can't be used in the LValue. How does the compiler allocate memory to a literals? What is the scope of a literals? Why can't we get its address with an &12 in its scope? 回答1: OK Bad example in the question. But the question is still valid: Lets try: Foo getFoo() {return Foo();} int func() { getFoo().bar(); // Creates temporary. // before this comment it is also destroyed. // But it lives for the whole expression above // So you can

Why does one of my variables doesn't need declaration while the other one does?

由 随声附和 提交于 2019-12-07 17:39:28
This code runs without errors. But in the function find_available_filenumber the variable render_folder isn't declared. So my question is why this doesn't produce an error? If I remove full_filename as a parameter, I get the error: UnboundLocalError: local variable 'full_filename' referenced before assignment. I don't understand why this doesn't also happen with render_folder , in my code example below: import bpy import os #Functions def find_available_filenumber(full_filename): file_number = 1 while os.path.exists(render_folder + "\\" + full_filename): file_number += 1 full_filename = create

xslt keep multiple variables in scope depending on a single test

由 吃可爱长大的小学妹 提交于 2019-12-07 16:25:28
I have many variables and only two cases. My original approach goes out of scope : <xsl:choose> <xsl:when test='$something = 6'> <xsl:variable name="foo">x</xsl:variable> <!-- 50 other variables --> </xsl:when> <xsl:when test='$something = 7'> <xsl:variable name="foo">y</xsl:variable> <!-- 50 other variables --> </xsl:when> </xsl:choose> ie. later, with saxon, XPST0008: Variable x has not been declared (or its declaration is not in scope) I think it would work if I would choose inside an xsl:variable tag, but then the tests would be repeated over and over and over and over and over: <xsl

Overwriting iframe's document.write

由 南笙酒味 提交于 2019-12-07 16:11:58
问题 For my own purposes ( cough lazy-loading an ad script), I am overwriting the document.write function in order to buffer the script's output, writing it to a div, and restoring the native document.write when I am done. The pseudo-code looks something like this: save off native code document.write redefine document.write eval and buffer output of script when script is done, write buffer to restore native document.write The problem happens in the bolded step - one of the lines in the ad script

Difference of two $scope array in angular js

由 ぃ、小莉子 提交于 2019-12-07 14:39:31
问题 Is there a way to return the difference between two array present in a scope in angularjs For example, $scope.user1 = ['a', 'b']; $scope.user2 = ['a', 'b', 'c', 'd']; Difference of these two should give me an another as $scope.user3= ['c','d'] 回答1: Underscore.js has the difference method for this. http://underscorejs.org/#difference $scope.user1 = ['a', 'b']; $scope.user2 = ['a', 'b', 'c', 'd']; $scope.user3 = _.difference($scope.user2, $scope.user1); 回答2: Angular can't do anything about it.

memory efficient way of passing large objects in R

由 放肆的年华 提交于 2019-12-07 14:26:20
问题 I have a function that needs to access a variable in its parent environment (scope from which the function is called). The variable is large in terms of memory so I would prefer not to pass it to by value to the function being called. Is there a standard way of doing this other than declaring the variable in the global scope? For example: g <- function (a, b) { #do stuff} f <- function(x) { y <- 3 #but in my program y is very large g(x, y) } I would like to access y in g() . So something like

VBA: Arrays and Global Variable Declarations

由 偶尔善良 提交于 2019-12-07 13:54:48
问题 I need to declare an array in VBA that will be used by every function. However, I cannot declare it as a global as I would do in C++. My code is as follows: Option Explicit Dim test(0 to 10) as String test(0) = "avds" test(1) = "fdsafs" .... The following conceptualizes what I am trying to do. public function store() as boolean Worksheets("test").cells(1,1) = test(0) End Function How can I achieve this functionality? 回答1: For global declaration, change Dim to Public like so: Public test(0 to

node.js - configure node to load functions into the global scope?

由 自作多情 提交于 2019-12-07 12:49:49
问题 in realier days I saw somewhere that we can configure node-js to execute a loaded module in the global scope, I can't find how to do that now. Why I'm asking? I have some legacy files that define language utilities that I want to use on both the server and on the client, however many of these utilities are defined as global scope functions. For example, I have functions like closure(fClosure) , module(fModule) , and many more that simply organize your code in readable definitive way, and

Undocumented changes to Powershell Scope handling v2/v3?

由 ▼魔方 西西 提交于 2019-12-07 12:44:32
问题 Background : I've been writing a powershell script to migrate files from a Sharpoint 2010 instance on Windows Server '08 (with Powershell 2.x) to a Sharepoint 2013 instance on Windows Server '12 (with Powershell 3.x). I have that working but I noticed a change in how scope is handled. Issue : I have the following code that gets run on both PSSessions ( $param is a hashtable of parameter values) Invoke-Command -session $Session -argumentlist $params -scriptblock ` { Param ($in) $params = $in #

Javascript setInterval scoping issue

由 别来无恙 提交于 2019-12-07 12:30:18
问题 I have a class I am attempting to use to manage a session on the client side, it looks like this: var sessionmanager; sessionmanager = (function() { sessionmanager.name = 'sessionmanager'; function sessionmanager(timeout, action) { if (action != null) { this.action = action; } else { this.action = null; } if (timeout != null) { this.timeout = timeout * 60; } else { this.timeout = 0; } } sessionmanager.prototype.run = function() { return window.setInterval(this.tick, 1000); }; sessionmanager
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