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When should I use double instead of decimal?
...ecimal is causing bottlenecks or slow-downs. In those cases, I will "down cast" to double or float, but only do it internally, and carefully try to manage precision loss by limiting the number of significant digits in the mathematical operation being performed.
In general, if your value is transie...
Why is unsigned integer overflow defined behavior but signed integer overflow isn't?
...and Y, there will exist some other value Z such that X+Z will, if properly cast, equal Y and Y-Z will, if properly cast, equal X). If unsigned values were merely storage-location types and not intermediate-expression types (e.g. if there were no unsigned equivalent of the largest integer type, and ...
How does virtual inheritance solve the “diamond” (multiple inheritance) ambiguity?
...nheritance diagrams to show the derived classes below the bases. (see "downcast", "upcast")
– peterh - Reinstate Monica
Jul 8 '16 at 20:27
...
Actionbar notification count icon (badge) like Google has
... @Override
public void onClick(View v) {
onHotlistSelected();
}
};
return super.onCreateOptionsMenu(menu);
}
// call the updating code on the main thread,
// so we can call this asynchronously
public void updateHotCount(final int new_hot_number) {
hot_nu...
Use of 'const' for function parameters
...o allows the compiler to make certain performance decisions.
*: Unless it casts away the const-ness, but that's another post.
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Create Generic method constraining T to an Enum
...ty else str
Enum.GetValues(typedefof<'T>)
|> Seq.cast<_>
|> Seq.tryFind(fun v -> String.Compare(v.ToString(), str.Trim(), true) = 0)
|> function Some x -> x | None -> defaultValue
This one is easier to maintain since it's a well-known l...
What are some uses of template template parameters?
...ALUE> class interface {
void do_something(VALUE v) {
static_cast<DERIVED*>(this)->do_something(v);
}
};
template <typename VALUE> class derived : public interface<derived, VALUE> {
void do_something(VALUE v) { ... }
};
typedef interface<derived<int...
What's the best way to put a c-struct in an NSArray?
...tableArray *)arrayRef;
struct {int member;} myStruct = {.member = 42};
// Casting to "id" to avoid compiler warning
[array addObject:(id)&myStruct];
// Hurray!
struct {int member;} *mySameStruct = [array objectAtIndex:0];
The above example completely ignores the issues with respect to memory...
Abstract class in Java
...
If we wish to access a member specific to a particular subclass, we must cast down to that subclass first:
// Say ImplementingClass also contains uniqueMethod()
// To access it, we use a cast to tell the runtime which type the object is
AbstractClass b = new ImplementingClass();
((ImplementingCla...
Calling Objective-C method from C++ member function?
...ompile everything as Objective-C++ do you get warnings about using C-style casts and/or other C++-specific warnings about valid C-style code?
– dreamlax
Jun 30 '09 at 3:47
...