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What is the effect of extern “C” in C++?
... C compiler does not use mangling which c++'s does. So if you want call a c interface from a c++ program, you have to clearly declared that the c interface as "extern c".
– Sam Liao
Jun 25 '09 at 2:28
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How to get the difference between two arrays of objects in JavaScript
...bjects are equal. Like all functions that return true or false, it can be called a "predicate function", but that's just terminology. The main point is that makeSymmDiffFunc is configured with a function that accepts two objects and returns true if we consider them equal, false if we don't.
Using...
How to check if smtp is working from commandline (Linux) [closed]
I have a SMTP-server, for the purpose of this question lets call it: smtp.mydomain.com.
4 Answers
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What is the difference between include and extend in Ruby?
...nts to the target's metaclass (i.e. the singleton class)
e.g.
if you call Klazz.extend(Mod), now Klazz has Mod's methods (as class methods)
if you call obj.extend(Mod), now obj has Mod's methods (as instance methods), but no other instance of of obj.class has those methods added.
extend is a p...
Need to understand the usage of SemaphoreSlim
...hat there won't be more than 10 workers doing this work at the same time.
Calling WaitAsync on the semaphore produces a task that will be completed when that thread has been given "access" to that token. await-ing that task lets the program continue execution when it is "allowed" to do so. Having...
How do you Force Garbage Collection from the Shell?
...n java.lang:type=Memory
#bean is set to java.lang:type=Memory
$>run gc
#calling operation gc of mbean java.lang:type=Memory
#operation returns:
null
$>quit
#bye
Look at the docs on the jmxterm web site for information about embedding this in bash/perl/ruby/other scripts. I've used popen2 in...
ant warning: “'includeantruntime' was not set”
... set that once somewhere in the buildfile instead of littering every javac call with it...
– Jonik
Jul 2 '11 at 7:42
1
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Scala: What is the difference between Traversable and Iterable traits in Scala collections?
...versables don't.
A Traversable has one abstract method: foreach. When you call foreach, the collection will feed the passed function all the elements it keeps, one after the other.
On the other hand, an Iterable has as abstract method iterator, which returns an Iterator. You can call next on an It...
Instance attribute attribute_name defined outside __init__
I split up my class constructor by letting it call multiple functions, like this:
6 Answers
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How to check if a string starts with one of several prefixes?
...hing via regular expressions is much more expensive than raw string method calls. Exact figures I cannot give, but this is the general consensus.
– klaar
Mar 21 '16 at 15:47
a...