The rule is very simple: every object created with new must be destroyed exactly once with delete; every array created with new[] must be destroyed exactly once with delete[]; everything else must not be deleted. So your code is correct; you are deleting mc after creating it with new, and not deleting the members which … Read more
If you are having multiple views in your application, and in that case you want to have a variable accessible to every view, you should always create a Model/Data class and define the variable in it. Something like this : Objective-C : //DataClass.h @interface DataClass : NSObject { NSString *str; } @property(nonatomic,retain)NSString *str; +(DataClass*)getInstance; @end … Read more
You redeclare gsd as a new variable inside your function. Remove var in front of gsd inside the function to address the gsd in the outer scope.
XSLT is a functional language and among other things this means that variables in XSLT are immutable and once they have been defined their value cannot be changed. Here is how the same effect can be achieved in XSLT: <xsl:stylesheet version=”1.0″ xmlns:xsl=”http://www.w3.org/1999/XSL/Transform”> <xsl:output omit-xml-declaration=”yes” indent=”yes”/> <xsl:strip-space elements=”*”/> <xsl:template match=”https://stackoverflow.com/”> <posts> <xsl:for-each select=”data/posts/entry”> <xsl:variable name=”i” select=”position()” … Read more
I assume this forum posting, which I quote fully below, should answer the question. Inside a procedure, function, or trigger definition, or in a dynamic SQL statement (embedded in a host program): BEGIN ATOMIC DECLARE example VARCHAR(15) ; SET example=”welcome” ; SELECT * FROM tablename WHERE column1 = example ; END or (in any environment): … Read more
Java’s compiler won’t let you define variables and use them before they were assigned a value, so the problem doesn’t exist in the same form as it exists in php. EDIT If in your case the compiler didn’t stop you already (because this is eg an instance variable) the best solution is probably to initialize … Read more
Yes. That is it. It is often used for enum as well. The only common exception is for logging where you might see private static final Logger log = Logger.getLogger(getClass().getName()); but I prefer LOG I often write this as UPPER_CASE, but I also write TitleCase for classes and camelCase for variables and methods.
You may change the css variable using plain JavaScript elem.style.setProperty(“variableName”, “variableProp”); $(“html”).on(‘click’, function() { $(“body”).get(0).style.setProperty(“–color”, “hotpink”); }); body { –color: blue; background-color: var(–color); } <script src=”https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js”></script> click me!
The RegExp constructor takes a string and creates a regular expression out of it. function name(str,replaceWhat,replaceTo){ var re = new RegExp(replaceWhat, ‘g’); return str.replace(re,replaceTo); } If replaceWhat might contain characters that are special in regular expressions, you can do: function name(str,replaceWhat,replaceTo){ replaceWhat = replaceWhat.replace(/[-\/\\^$*+?.()|[\]{}]/g, ‘\\$&’); var re = new RegExp(replaceWhat, ‘g’); return str.replace(re,replaceTo); } See … Read more
Try this: // using System.CodeDom.Compiler; CodeDomProvider provider = CodeDomProvider.CreateProvider(“C#”); if (provider.IsValidIdentifier (YOUR_VARIABLE_NAME)) { // Valid } else { // Not valid }