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'typeid' versus 'typeof' in C++
...ay that cat derives animal:
animal* a = new cat; // animal has to have at least one virtual function
...
if( typeid(*a) == typeid(cat) )
{
// the object is of type cat! but the pointer is base pointer.
}
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Why is there a `null` value in JavaScript?
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They aren't the same semantic concept. To me at least, there is a significant difference between a property being assigned a null value, and a property not existing.
– Daniel Schaffer
Jan 20 '09 at 16:31
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Input size vs width
...wsers and their possible font settings.
The width style set in px will at least be consistent, modulo box-sizing issues. You might also want to set the style in ‘em’ if you want to size it relative to the font (though again, this will be inconsistent unless you set the input's font family and s...
How do I ignore the initial load when watching model changes in AngularJS?
...ead of type. But this answer definitely shows the most effective method at least.
– Saborknight
Mar 31 '17 at 10:14
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How to prevent multiple instances of an Activity when it is launched with different Intents
...ted is not the root activity of the task, there must (by definition) be at least one other activity underneath it. If this activity calls finish() then the user will see the activity that was underneath. Because of that you can safely assume that the existing instance of the app will be brought to t...
Does Python have “private” variables in classes?
... classes can change a member variable simplifies the debugging process. At least, if the variable is protected by some scope. A similar concept is const functions in C++. I know that member variables weren't changed in there and so I don't even look at that method as the potential cause of a bad var...
Cryptic “Script Error.” reported in Javascript in Chrome and Firefox
... script was run from a different domain then the web page, and onerror (at least in Firefox) just says "Script error" in such a case.
– Tgr
Oct 11 '11 at 11:03
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How can I push a local Git branch to a remote with a different name easily?
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This doesn't seem to work - at least not on never versions of git
– Thomas Watson
Sep 21 '15 at 12:23
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Is it possible to change the package name of an Android app on Google Play?
...the users who already installed it won't have access to it anymore, but at least the potential new users won't find it on the market.
Not ideal and can be annoying to the users, sometimes even impossible to implement due to the status/possibilities of the app. But since Google left us no choice th...
How to use the pass statement?
... is supposed to happen, and does not need to be actually evaluated and (at least temporarily) stored in memory.
Ignoring (all or) a certain type of Exception (example from xml):
try:
self.version = "Expat %d.%d.%d" % expat.version_info
except AttributeError:
pass # unknown
Note: Ignorin...