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How expensive is RTTI?
...
if (typeid(a) == typeid(b)) {
B* ba = static_cast<B*>(&a);
etc;
}
instead of
B* ba = dynamic_cast<B*>(&a);
if (ba) {
etc;
}
The former involves only one comparison of std::type_info; the latter necessarily involves traversing an inheritance tree plus comparisons.
P...
How do I clear the terminal screen in Haskell?
...s functions for clearing the screen, displaying colors, moving the cursor, etc. Using it to clear the screen is easy: (this is with GHCI) import System.Console.ANSIclearScreen
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When do you use Git rebase instead of Git merge?
...eating here -- remember that all these terms (merge, rebase, fast-forward, etc.) are referring to specific manipulations of a directed acyclic graph. They become easier to reason about with that mental model in mind.
– Roy Tinker
Jan 27 '17 at 19:24
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Standard Android menu icons, for example refresh [closed]
...download a lot of sources editable with Fireworks, Illustrator, Photoshop, etc...
And there's also fonts and icon packs.
Here is a stencil example.
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How do JavaScript closures work?
...s created and a completely new variable x, and a new set of functions (log etc.) are created, that close over this new variable.
function createObject() {
let x = 42;
return {
log() { console.log(x) },
increment() { x++ },
update(value) { x = value }
}
}
const o = createObject...
How to enable local network users to access my WAMP sites?
...s
Inside alias folder you will see some files
like phpmyadmin,phpsysinfo,etc...
open each file, and you can see inside file some commented instruction are give to access from outside ,like
to give access to phpmyadmin from outside
replace the lines
Require local
by
Require all granted...
Auto column width in EPPlus
... the range, just make sure to call this after you've formatted all columns etc:
worksheet.Cells.AutoFitColumns()
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JavaScript, get date of the next day [duplicate]
... 00:00:00
Please note that it's zero indexed, so Jan. is 0, Feb. is 1 etc.
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Android Fragments. Retaining an AsyncTask during screen rotation or configuration change
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@jakk The lifecycle methods for Activitys, Fragments, etc. are invoked sequentially by the main GUI thread's message queue, so even if the task finished concurrently in the background before these lifecycle methods completed (or even invoked), the onPostExecute method would stil...
How to get the response of XMLHttpRequest?
...
I'd suggest looking into fetch. It is the ES5 equivalent and uses Promises. It is much more readable and easily customizable.
const url = "https://stackoverflow.com";
fetch(url)
.then(
response => response.text() // .json(), etc...