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Using variables inside a bash heredoc
...text in a variable.
Name='Rich Ba$tard'
dough='$$$dollars$$$'
cat <<____HERE
$Name, you can win a lot of $dough this week!
Notice that \`backticks' need escaping if you want
literal text, not `pwd`, just like in variables like
\$HOME (current value: $HOME)
____HERE
Demo: https://ideone.com/...
Add custom messages in assert?
...
or with a macro: #ifndef m_assert #define m_assert(expr, msg) assert((msg, expr)) #endif
– Szymon Marczak
Aug 3 '17 at 10:50
...
How can I convert spaces to tabs in Vim or Linux?
...ist', so that I can see the whitespace and change.
I have the following mapping in my .vimrc for this:
nnoremap <F2> :<C-U>setlocal lcs=tab:>-,trail:-,eol:$ list! list? <CR>
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How do I change the background color of the ActionBar of an ActionBarActivity using XML?
...t;
</style>
</resources>
And, set "MyTheme" as theme for application / activity.
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Use numpy array in shared memory for multiprocessing
...not available anymore) and @Henry Gomersall's answers. You could use shared_arr.get_lock() to synchronize access when needed:
shared_arr = mp.Array(ctypes.c_double, N)
# ...
def f(i): # could be anything numpy accepts as an index such another numpy array
with shared_arr.get_lock(): # synchroniz...
How to properly add cross-site request forgery (CSRF) token using PHP
... deterministically
Try this out:
Generating a CSRF Token
PHP 7
session_start();
if (empty($_SESSION['token'])) {
$_SESSION['token'] = bin2hex(random_bytes(32));
}
$token = $_SESSION['token'];
Sidenote: One of my employer's open source projects is an initiative to backport random_bytes() a...
Is there a performance difference between a for loop and a for-each loop?
...g4j.Marker, org.apache.logging.log4j.Marker...);
Code:
0: iconst_0
1: istore_2
2: aload_1
3: arraylength
4: istore_3
5: iload_2
6: iload_3
7: if_icmpge 29
10: aload_1
11: iload_2
12: aaload
13: astore 4
...
$watch'ing for data changes in an Angular directive
...gular only checks the reference of the top level variable that you watch.
App.directive('d3Visualization', function() {
return {
restrict: 'E',
scope: {
val: '='
},
link: function(scope, element, attrs) {
scope.$watch('val', function(newVa...
Performance differences between debug and release builds
... becomes x = 3; This simple example is caught early by the compiler, but happens at JIT time when other optimizations make this possible.
Copy propagation. x = a; y = x; becomes y = a; This helps the register allocator make better decisions. It is a big deal in the x86 jitter because it has few ...
Set up Heroku and GoDaddy? [closed]
...'Points to' should be your Heroku address (example
supermoo-bil-3411.herokuapp.com). TTL can be 1 hour.
It can take some time for the DNS to propogate. For me it took about 10 minutes.
That's it! supermoo-bil-3411.herokuapp.com will now be under www.example.com :)
Create a naked domain:
A naked...