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What are all the common undefined behaviours that a C++ programmer should know about? [closed]
...volatile or sig_atomic_t at the receipt of a signal
Attempting to modify a string literal or any other const object during its lifetime
Concatenating a narrow with a wide string literal during preprocessing
Function and Template
Not returning a value from a value-returning function (directly or by...
How can building a heap be O(n) time complexity?
...for example, when retrieving items with integer keys in ascending order or strings in alphabetical order. The principles are exactly the same; simply switch the sort order.
The heap property specifies that each node in a binary heap must be at least as large as both of its children. In particular, t...
Best way to create an empty object in JSON with PHP?
...
Well, json_encode() simply returns a string from a PHP array/object/etc. You can achieve the same effect much more efficiently by doing:
$json = '{}';
There's really no point in using a function to accomplish this.
UPDATE
As per your comment updates, you cou...
How to bind to a PasswordBox in MVVM
...t on the client machine RAM is a security no-no.
So get rid of that public string Password { get; set; } you've got up there.
When accessing PasswordBox.Password, just get it out and ship it to the server ASAP.
Don't keep the value of the password around and don't treat it as you would any other ...
Is short-circuiting logical operators mandated? And evaluation order?
...nt after the evaluation of the first expression (12).
In C++ there is an extra trap: short-circuiting does NOT apply to types that overload operators || and &&.
Footnote 12: The operators indicated in this paragraph are the built-in operators, as described in clause 5. When one of thes...
How do JavaScript closures work?
...clared outside the function, regardless of when and where the function is called.
If a function was called by a function, which in turn was called by another function, then a chain of references to outer lexical environments is created. This chain is called the scope chain.
In the following code, in...
How do I avoid capturing self in blocks when implementing an API?
...ied inside the block (we're not doing that) but also they are not automatically retained when the block is retained (unless you are using ARC). If you do this, you must be sure that nothing else is going to try to execute the block after the MyDataProcessor instance is released. (Given the structure...
Chaining multiple filter() in Django, is this a bug?
I always assumed that chaining multiple filter() calls in Django was always the same as collecting them in a single call.
4...
Java GUI frameworks. What to choose? Swing, SWT, AWT, SwingX, JGoodies, JavaFX, Apache Pivot? [close
...course you can integrate your custom controls as well, but that takes some extra effort.
share
edited Sep 9 '11 at 12:50
...
How do I perform the SQL Join equivalent in MongoDB?
...rect. The new $lookup operator added to the aggregation pipeline is essentially identical to a left outer join:
https://docs.mongodb.org/master/reference/operator/aggregation/lookup/#pipe._S_lookup
From the docs:
{
$lookup:
{
from: <collection to join>,
localField: <...