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What are all the common undefined behaviours that a C++ programmer should know about? [closed]
...literal during preprocessing
Function and Template
Not returning a value from a value-returning function (directly or by flowing off from a try-block)
Multiple different definitions for the same entity (class, template, enumeration, inline function, static member function, etc.)
Infinite recursion...
Heap vs Binary Search Tree (BST)
... new elements are almost certain to go at the bottom
heap insertion starts from the bottom, BST must start from the top
In a binary heap, increasing the value at a given index is also O(1) for the same reason. But if you want to do that, it is likely that you will want to keep an extra index up-to...
Propagate all arguments in a bash shell script
...e script that calls another script, and I need to propagate the parameters from my current script to the script I am executing.
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conversion from string to json object android
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To get a JSONObject or JSONArray from a String I've created this class:
public static class JSON {
public Object obj = null;
public boolean isJsonArray = false;
JSON(Object obj, boolean isJsonArray){
this.obj = obj;
th...
Is there a difference between using a dict literal and a dict constructor?
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I think you have pointed out the most obvious difference. Apart from that,
the first doesn't need to lookup dict which should make it a tiny bit faster
the second looks up dict in locals() and then globals() and the finds the builtin, so you can switch the behaviour by defining a loca...
New Array from Index Range Swift
How can I do something like this? Take the first n elements from an array:
5 Answers
5...
github: No supported authentication methods available
...ord the first time you start the git command prompt, then will remember it from then on, until you reboot your computer. Very handy so you don't have to keep entering your password each time you want to do something.
SSH_ENV="$HOME/.ssh/environment"
GIT_SSH="/usr/bin/ssh.exe"
function start_agent ...
JavaScript: filter() for Objects
...t is a negative filter, where a positive return value means it is excluded from the result. If you look at the jsFiddle example, he's filtering out existing properties that are undefined.
– user113716
Aug 22 '11 at 13:09
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Why does one often see “null != variable” instead of “variable != null” in C#?
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It's a hold-over from C. In C, if you either use a bad compiler or don't have warnings turned up high enough, this will compile with no warning whatsoever (and is indeed legal code):
// Probably wrong
if (x = 5)
when you actually probably ...
var self = this?
...stance methods as callbacks for event handlers changes the scope of this from "My instance" to "Whatever just called the callback" . So my code looks like this
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