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What is the difference between a weak reference and an unowned reference?
...old on the referred object (a.k.a. they don't increase the retain count in order to prevent ARC from deallocating the referred object).
But why two keywords? This distinction has to do with the fact that Optional types are built-in the Swift language. Long story short about them: optional types offe...
Preview an image before it is uploaded
I want to be able to preview a file (image) before it is uploaded. The preview action should be executed all in the browser without using Ajax to upload the image.
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JUnit vs TestNG [closed]
...c annotated method that it finds will be used, but it may find them in any order. This causes us to write different classes unnecessarily. However TestNG provides clean way to provide different kind of data providers for each and every method. So we can test the same unit of code with valid and inva...
Integer division with remainder in JavaScript?
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RegEx match open tags except XHTML self-contained tags
... can generate the correct pattern with a script that does each of these in order:
Solve the Halting Problem.
Square a circle.
Work out the Traveling Salesman Problem in O(log n) or less. If it's any more than that, you'll run out of RAM and the engine will hang.
The pattern will be pretty big, so...
How can I use UUIDs in SQLAlchemy?
Is there a way to define a column (primary key) as a UUID in SQLAlchemy if using PostgreSQL (Postgres)?
9 Answers
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How do function pointers in C work?
... preparing the instance of the String, the newString function is called in order to set up the function pointers to their respective functions:
String newString()
{
String self = (String)malloc(sizeof(struct String_Struct));
self->get = &getString;
self->set = &setString;...
What does it mean to “program to an interface”?
...a. In Java or C# that means using public properties and methods instead of raw field access. For C that means using functions instead of raw pointers.
EDIT: And with databases it means using views and stored procedures instead of direct table access.
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Get first n characters of a string
...o trim a string to a specific number of characters, and append '...' if needed?
19 Answers
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Terminal Multiplexer for Microsoft Windows - Installers for GNU Screen or tmux [closed]
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