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Object-orientation in C
...truct derived *)base_ptr; // downcast
To get polymorphism (i.e. virtual functions), you use function pointers, and optionally function pointer tables, also known as virtual tables or vtables:
struct base;
struct base_vtable
{
void (*dance)(struct base *);
void (*jump)(struct base *, int ...
Why implement interface explicitly?
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Michael BMichael B
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Where do I find the definition of size_t?
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123
From Wikipedia
The stdlib.h and stddef.h header files define a datatype called size_t1 which ...
Best way to store time (hh:mm) in a database
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Another fun problem is if you are relying on the time component, it will not account for the Daylight savings adjustments when used at different times of the year.
– Chris Seufert
Nov 23 '17 at ...
Get an object properties list in Objective-C
...}
free(properties);
}
This required me to make a 'getPropertyType' C function, which is mainly taken from an Apple code sample (can't remember right now the exact source):
static const char *getPropertyType(objc_property_t property) {
const char *attributes = property_getAttributes(proper...
How to send objects through bundle
...lication = (CustomApplication)getApplication();
application.someVariable = 123;
Hope that helps.
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How to change the type of a field?
...now how you'd convert a string (think currency like '1.23') to the integer 123? I assume you'd have to parse it as a float or decimal, multiply it by 100, then save it as an integer, but I can't find the right docs to do this. Thanks!
– Brian Armstrong
Feb 23...
How to create local notifications?
...notification.
Swift:
You AppDelegate.swift file should look like this:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
application.registerUser...
Test if string is a number in Ruby on Rails
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\Z allows to have \n at the end of the string, so "123\n" will pass validation, regardless that it's not fully numeric. But if you use \z then it will be more correct regexp: /\A\d+\z/
– SunnyMagadan
Aug 14 '17 at 9:14
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Can an Option in a Select tag carry multiple values?
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one option is to put multi value with comma seperated
like
value ="123,1234"
and in the server side separate them
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