Is there a way to call a private Class method from an instance in Ruby?
Other than self.class.send :method, args..., of course. I'd like to make a rather complex method available at both the class and instance level without duplicating the code. ...
scope
PHP: $_SESSION - What are the pros and cons of storing temporarily used data in the $_SESSION variable
One thing I've started doing more often recently is retrieving some data at the beginning of a task and storing it in a $_SESSION['myDataForTheTask']. Now it seems very convenient to do so but I don't know anything about performance, security risks or similar, using this approach. Is it something which is regularly done by programmers ...
Perl: variable scope issue with CGI & DBI modules
I've run into what appears to be a variable scope issue I haven't encountered before. I'm using Perl's CGI module and a call to DBI's do() method. Here's the code structure, simplified a bit: use DBI; use CGI qw(:cgi-lib); &ReadParse; my $dbh = DBI->connect(...............); my $test = $in{test}; $dbh->do(qq{INSERT INTO events VALUES (?...
Why aren't variables declared in "try" in scope in "catch" or "finally"?
In C# and in Java (and possibly other languages as well), variables declared in a "try" block are not in scope in the corresponding "catch" or "finally" blocks. For example, the following code does not compile: try { String s = "test"; // (more code...) } catch { Console.Out.WriteLine(s); //Java fans: think "System.out.println" ...
Properly scoped transactions in Stored Procs
Suppose I have a stored procedure that manages its own transaction CREATE PROCEDURE theProc AS BEGIN BEGIN TRANSACTION -- do some stuff IF @ThereIsAProblem ROLLBACK TRANSACTION ELSE COMMIT TRANSACTION END If I call this proc from an existing transaction, the proc can ROLLBACK the external transaction. BEGIN TRANSACTI...
Making code internal but available for unit testing from other projects
We put all of our unit tests in their own projects. We find that we have to make certain classes public instead of internal just for the unit tests. Is there anyway to avoid having to do this. What are the memory implication by making classes public instead of sealed? ...
What is the scope for imported classes in python?
Please excuse the vague title. If anyone has a suggestion, please let me know! Also please retag with more appropriate tags! The Problem I want to have an instance of an imported class be able to view things in the scope (globals, locals) of the importer. Since I'm not sure of the exact mechanism at work here, I can describe it much...
Why does strcpy trigger a segmentation fault with global arguments?
So I've got some C code: #include <stdio.h> #include <string.h> /* putting one of the "char*"s here causes a segfault */ void main() { char* path = "/temp"; char* temp; strcpy(temp, path); } This compiles, runs, and behaves as it looks. However, if one or both of the character pointers is declared as global variable, strcpy res...
PHP Class Database Connection Scope Issue
For a new project that I'm doing in PHP I've created an SQLMethods class to connect to the database and perform queries. Tonight was the first night that I actually got to test it (I wrote it a week or so ago and forgot about it) and an unexpected error occured: When it was calling my ExecuteQuery() function, it wouldn't use the database...
Python scope
Hello, I am trying to figure out this: c = 1 def f(n): print c + n def g(n): c = c + n f(1) => 2 g(1) => UnboundLocalError: local variable 'c' referenced before assignment Thanks! ...
How to properly implement a shared cache in ColdFusion?
I have built a CFC designed to serve as a dynamic, aging cache intended for almost everything worth caching. LDAP queries, function results, arrays, ojects, you name it. Whatever takes time or resources to calculate and is needed more than once. I'd like to be able to do a few things: share the CFC between applications define the scope...
JavaScript Callback Scope
I'm having some trouble with plain old JavaScript (no frameworks) in referencing my object in a callback function. function foo(id) { this.dom = document.getElementById(id); this.bar = 5; var self = this; this.dom.addEventListener("click", self.onclick, false); } foo.prototype = { onclick : function() { this...
What, exactly, distinguishes between private and protected (in Flex)?
In Flex (and many other languages) a function/method of a class can be declared private or protected (or public). What's the difference? I have the impression it has something to do with the relationship to child classes and how things are inherited or can be called, but I'm not sure what, exactly. ...
SQL - table alias scope.
I've just learned ( yesterday ) to use "exists" instead of "in". BAD select * from table where nameid in ( select nameid from othertable where otherdesc = 'SomeDesc' ) GOOD select * from table t where exists ( select nameid from othertable o where t.nameid = o.nameid and otherdesc = 'SomeDesc' ) And I...
Flexibility in the project scope?
How flexible should a programmer be if a client requests requirements that is not in the project scope? ...
Scope problem - Controling a movieclip inside a button with actionscript
Hello everyone, I'm trying to show/hide a movieclip (or graphic) symbol that is on a layer of a button symbol using actionscript 2. Here's what I tried in the actions for the button: on (release) { this.button_name.movieclip_name._alpha = 0; trace(this.button_name.movieclip_name); } and the trace returns undefined... so I think I'...
How can I localize Perl variables in a different stack frame?
I have some auto-generated code which effectively writes out the following in a bunch of different places in some code: no warnings 'uninitialized'; local %ENV = %ENV; local $/ = $/; local @INC = @INC; local %INC = %INC; local $_ = $_; local $| = $|; local %SIG = %SIG; use warnings 'uninitialized'; When auto-generating code, som...
What is the scope of a function in Javascript/ECMAScript?
Hello Javascript experts Today I had a discussion with a colleague about nested functions in Javascript: function a() { function b() { alert('boo') } var c = 'Bound to local call object.' d = 'Bound to global object.' } In this example, trials point out that b is not reachable outside the body of a, much like c is. ...
[Javascript] How to solve Var out of scope within setTimeout call
I am trying to call a setTimeout from within a setInterval callback: function callback() { //assign myVar var myVar = document.getElementById("givenID"); //... //now wait 2 secs then call some code that uses myVAr setTimeout("myVar.innerHTML = 'TEST'", 2000); } setInterval("callback();", 10000); setInterval works as ex...
What do curly braces by themselves mean in java?
for example, I have the following code (generated, not written) if(node.getId() != null) { node.getId().apply(this); } { List<PExp> copy = new ArrayList<PExp>(node.getArgs()); for(PExp e : copy) { e.apply(this); } } outAMethodExp(node); What do those extra curly...