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What does the PHP error message “Notice: Use of undefined constant” mean?
...;
}
Referring to a class constant without specifying the class scope
In order to refer to a class constant you need to specify the class scope with ::, if you miss this off PHP will think you're talking about a global define().
Eg:
class MyClass {
const MY_CONST = 123;
public function my_m...
在 App Inventor 2 中使用图像 · App Inventor 2 中文网
...igned phone area. Even so, the large image needs to be held in memory in order for rescaling to occur, even if the result of the rescaling will be a small image.
2. An example of misusing large images
Suppose you are going to display a grid of the letters of the alphabet, where each letter is in ...
lenses, fclabels, data-accessor - which library for structure access and mutation is better
...wtype T r a = Cons { decons :: a -> r -> (a, r) }
Consequently, in order to get the value of a lens, you must submit an undefined value for the 'a' argument! This strikes me as an incredibly ugly and ad hoc implementation.
That said, Henning has included the template-haskell plumbing to aut...
OOP vs Functional Programming vs Procedural [closed]
...
In order to answer your question, we need two elements:
Understanding of the characteristics of different architecture styles/patterns.
Understanding of the characteristics of different programming paradigms.
A list of softw...
When should I use a List vs a LinkedList
... curNode = list.First;
for (var k = 0; k < i/2; k++) // In order to insert a node at the middle of the list we need to find it
curNode = curNode.Next;
list.AddAfter(curNode, a); // Insert it after
}
decimal sum = 0;
foreach (var i...
What are transparent comparators?
...en C only needs to be callable with arguments of type T and int (in either order), it doesn't need to be truly transparent. We used that name partly because we couldn't come up with a better name (I would have preferred is_polymorphic because such functors use static polymorphism, but there's alre...
Unable to export Apple production push SSL certificate in .p12 format
...
In order to export as p12 you either need to generate the cert from your machine or have the key that was used to generate it on your machine.
To ensure this will work:
Log in to Apple's Dev Center
Go to the Provisioning Port...
What is Mocking?
...t error)
This creating imaginary—similar to real is known as mocking.
In order to do this, you can't use your original code (your original code doesn't have the pre-inserted responses, right?). You must add something to it, inject/insert that dummy data which isn't normally needed (or a part of yo...
Why does my application spend 24% of its life doing a null check?
...npractical. Not in the least because you typically cannot predict in which order the nodes of the tree will be visited. A red-black tree might help, it isn't clear from the question. So a simple conclusion to draw is that it is already running as fast you can hope for. And if you need it to go faste...
How to use Regular Expressions (Regex) in Microsoft Excel both in-cell and loops
...g. a$ Last character must be lower case letter a
Precedence table:
Order Name Representation
1 Parentheses ( )
2 Multipliers ? + * {m,n} {m, n}?
3 Sequence & Anchors abc ^ $
4 Alternation |
Predefined Character Abbreviation...