It appears that in PHP objects are passed by reference. Even assignment operators do not appear to be creating a copy of the Object. Here’s a simple, contrived proof: <?php class A { public $b; } function set_b($obj) { $obj->b = “after”; } $a = new A(); $a->b = “before”; $c = $a; //i would … Read more
What is the best way to copy text to the iPhone’s clipboard in your application? Their docs are sketchy and have way more features than what I want… I just want to set a string as the users clipboard. 2 Answers 2
I’m having a little trouble understanding the pass-by-reference properties of data.table. Some operations seem to ‘break’ the reference, and I’d like to understand exactly what’s happening. On creating a data.table from another data.table (via <-, then updating the new table by :=, the original table is also altered. This is expected, as per: ?data.table::copy and … Read more
This question already has answers here: Record file copy operation with Git (2 answers) Closed 2 years ago. I have a somewhat confusing question in Git. Lets say, I have a file dir1/A.txt committed and git preserves a history of commits Now I need to copy the file into dir2/A.txt (not move, but copy). I … Read more
I have a Table (call it A_table) in a database (call it A_db) in Microsoft SQL Server Management Studio, and there are 10 rows. I have another database (call it B_db), and it has a Table (call it B_table), which has the same column settings as A_table has. But the B_table is empty. What I … Read more
I’ll admit that I’m a bit of a ruby newbie (writing rake scripts, now). In most languages, copy constructors are easy to find. Half an hour of searching didn’t find it in ruby. I want to create a copy of the hash so that I can modify it without affecting the original instance. Some expected … Read more
I would like to write a script which copies my current database sitedb1 to sitedb2 on the same mysql database instance. I know I can dump the sitedb1 to a sql script: mysqldump -u root -p sitedb1 >~/db_name.sql and then import it to sitedb2. Is there an easier way, without dumping the first database to … Read more
After E0_copy = list(E0), I guess E0_copy is a deep copy of E0 since id(E0) is not equal to id(E0_copy). Then I modify E0_copy in the loop, but why is E0 not the same after? E0 = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] for k in range(3): E0_copy = list(E0) E0_copy[k][k] = … Read more
How do I copy all files in a directory from another branch? I can list all of the files in that directory by doing git ls-tree master:dirname I can then copy all of the files individually by doing git checkout master — dirname/filename However, using wildcards has so far been a total fail. This does … Read more
I’m looking for a clean example of how to copy text to iOS clipboard that can then be used/pasted in other apps. The benefit of this function is that the text can be copied quickly, without the standard text highlighting functions of the traditional text copying. I am assuming that the key classes are in … Read more
