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One-liner to recursively list directories in Ruby?
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In PHP or other languages to get the content of a directory and all its subdirectories, you have to write some lines of code, but in Ruby it takes 2 lines:
require 'find'
Find.find('./') do |f| p f end
this will print the con...
Does java.util.List.isEmpty() check if the list itself is null? [duplicate]
...I deleted my stupid comment, before I saw your answer. Maybe he comes from PHP where we have !empty($foo) as somewhat an alias for isset($foo) && $foo != "".
– Aufziehvogel
Jul 16 '12 at 20:39
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Auto increment in phpmyadmin
I have an existing database using PHP, MySQL and phpMyAdmin.
9 Answers
9
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Iterator invalidation rules
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vector: The functions insert, emplace_back, emplace, push_back cause reallocation if the new size is greater than the old capacity. Reallocation invalidates all the references, pointers, and iterators referring to the elements in the sequence. If no reallocation
happens, all the iterators and re...
Attempt to set a non-property-list object as an NSUserDefaults
...ta *data = [currentDefaults objectForKey:@"yourKeyName"];
yourObjectType * token = [NSKeyedUnarchiver unarchiveObjectWithData:data];
For Remove
[currentDefaults removeObjectForKey:@"yourKeyName"];
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Performing Breadth First Search recursively
...tupidly ridiculous with the call stack that you shouldn't be.
On the same token, the nature of any non-tail recursion you try to implement is essentially adding a stack to the algorithm. This makes it no longer breadth first search on a binary tree, and thus the run-time and whatnot for traditiona...
Can an Android Toast be longer than Toast.LENGTH_LONG?
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android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
– Ahamadullah Saikat
Jan 8 at 11:37
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How expensive is RTTI?
...;typeid()
5) 14,261,000 Ticks (~23 Seconds) - typeid() with extra variable allocations.
So the conclusion would be:
For simple cast cases without optimisation typeid() is more than twice faster than dyncamic_cast.
On a modern machine the difference between the two is about 1 nanosecond (a milliont...
How to download a file from server using SSH? [closed]
...ote/dir/foobar.txt /local/dir
From: http://www.hypexr.org/linux_scp_help.php
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edited Mar 14 '15 at 9:31
Marek Grzenkowicz
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What is the difference between double-ampersand (&&) and semicolon (;) in Linux Bash?
...o make sure that command2 is only run if command1 ran successfully.
The ; token just separates commands, so it will run the second command regardless of whether or not the first one succeeds.
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