clone

It's too late to change the question, but more precise would have been to ask "Why does clone() not allow singletons?". A copy() method would be more convenient. Is there any reason why enums in Java cannot be cloned? The manual states that This guarantees that enums are never cloned, which is necessary to preserve their "singleton" status. But returning the instance itself would also preserve its status, and I would be able to handle associated enums the same way as other clonable objects. One may argue that The general intent [of clone()] is that, for any object x, the expression: x.clone()

This is my script: $('.addprop').click(function() { $('#clone').clone().insertAfter('.addprop'); }) I need to add a class to the new element that is being created. Is it possible? Yes, it is: $('.addprop').click(function() { $('#clone').clone().addClass('newClass').insertAfter('.addprop'); }) Although you're cloning an element based on its id , $('#clone') , so note that there will be two elements sharing the same id , which makes the result invalid HTML, so I'd suggest: $('.addprop').click(function() { $('#clone').clone().attr('id',id += 1).addClass('newClass').insertAfter('.addprop'); });

I want to make a copy of an array, to modify the copy in-place, without affecting the original one. This code fails a = [ '462664', '669722', '297288', '796928', '584497', '357431' ] b = a.clone b.object_id == a.object_id # => false a[1][2] = 'X' a[1] #66X722 b[1] #66X722 The copy should be different than the object. Why does it act like if it were just a reference? You need to do a deep copy of your array. Here is the way to do it Marshal.load(Marshal.dump(a)) This is because you are cloning the array but not the elements inside. So the array object is different but the elements it contains

I have a working Cloneable/CloneableImpl class pair below. It does its job as long as I have default constructors from child to parent. Suppose Animal's constructor is modified to Animal( std::string const& name ) , which needs the name to be passed up from the children class constructors. How can I incorporate this requirement into the structure while keeping Cloneable/CloneableImpl generic? In other words, I need to be able forward all constructor arguments from Lion, Tiger up to Animal. Is there a way to do this in C++11 in a generic manner? If it's not possible, how can these templates be

I have an input element like: <input class="input-m" name="formelement[]" type="text"> I want to clone it and store cloned html to a variable: var txt=jQuery("input[name="+n+"[]]:first").clone().html(); this returns an empty string. How can I get the html content from .clone() ? Try this var txt=jQuery("input[name="+n+"[]]:first").clone().wrap("<div />").parent().html(); I think you want the outer HTML instead of innerHTML: var text = $('<div>').append(jQuery("input[name="+n+"[]]:first").clone()).html(); .html() returns the html inside the element. I am guessing you have something like <input

I am completely unable to find any explanation how I should specify location of existing svn repository. In other words - what should be used as URL in git svn clone URL when svn repository is local? You should be able to succeed like this: git svn clone file:///e/svn_repo_on_E_drive Similar to svn checkout command: svn co file:///e/svn_repo_on_E_drive file:// for folder on the current drive of the executing CMD prompt, file:///d/some_folder for D:\some_folder . Note: The extra / and the removed drive colon in the file link on Windows. file://e:/svn_repo_on_E_drive → file:///e/svn_repo_on_E