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What does an exclamation mark mean in the Swift language?
...eLabel!.text
Implicitly unwrapped optionals: var logo: UIImageView!
Forced casting: logo.image = thing as! UIImage
Unhandled exceptions: try! NSJSONSerialization.JSONObjectWithData(data, [])
Every one of these is a different language construct with a different meaning, but they all have three impo...
What's the rationale for null terminated strings?
... to output, or
you would have to make it have a very strange behavior when casting it to char*. Namely
not to return the address of the string, but instead to return the actual data.
very easy to manipulate text data read from a file in-place, without useless copy of buffer,
just insert zeroes at th...
How does type Dynamic work and how to use it?
...g is that even the return type is correct - even though we had to add some casts.
But Scala would not be Scala when there is no way to find a way around such flaws. In our case we can use type classes to avoid the casts:
object DynTypes {
sealed abstract class DynType[A] {
def exec(as: A*): ...
In Firebase, is there a way to get the number of children of a node without loading all the node dat
...riority(user,count);
}
</script>
The 'risk' here is that a vote is cast, but the count not updated (haking or script failure). This is why the votes have a unique 'priority' - the script should really start by ensuring that there is no vote with priority higher than the current count, if the...
Why does calling a method in my derived class call the base class method?
...Now, some differences in behavior shake out; foo2, which is actually a Bar cast as a Foo, will still find the more derived method of the actual object type Bar. bar2 is a Baz, but unlike with foo2, because Baz doesn't explicitly override Bar's implementation (it can't; Bar sealed it), it's not seen ...
print call stack in C or C++
...;
int line = -1;
char const* file;
uintptr_t ip2 = reinterpret_cast<uintptr_t>(ip);
Dwfl_Module* module = dwfl_addrmodule(dwfl, ip2);
char const* name = dwfl_module_addrname(module, ip2);
function = name ? demangle(name) : "<unknown>";
if (Dwfl_Line* dwfl_line...
Ignoring time zones altogether in Rails and PostgreSQL
...as loaded footgun works for me, but only by coincidence. If you explicitly cast a literal to timestamp [without time zone], any time zone offset is ignored! Only the bare timestamp is used. The value is then automatically coerced to timestamptz in the example to match the column type. For this step,...
Correct way to override Equals() and GetHashCode() [duplicate]
...s a RecommendationDTO.
// The initial null check is unnecessary as the cast will result in null
// if obj is null to start with.
var recommendationDTO = obj as RecommendationDTO;
if (recommendationDTO == null)
{
// If it is null then it is not equal to this instance.
...
What is &&& operation in C
... used sometimes for defaults. Example: void fn(type& x = *reinterpret_cast<type*>(NULL)); What is the value of &x in fn if fn is called without parameters? It's 0 a.k.a. false. However, using it the way described, it'll always be true unless i == 0, and if one was using it as I des...
Correct way to integrate jQuery plugins in AngularJS
...Query plugins into my angular app. I've found several tutorials and screen-casts but they seem catered to a specific plugin.
...