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How and where are Annotations used in Java?
...s:
Class instance creation expression:
new @Interned MyObject();
Type cast:
myString = (@NonNull String) str;
implements clause:
class UnmodifiableList implements
@Readonly List<@Readonly T> { ... }
Thrown exception declaration:
void monitorTemperature() throws
@C...
How to get the name of enumeration value in Swift?
... case .Full:
return "Full"
}
}
}
And then casting the enum as String:
String(UIDevice.currentDevice().batteryState)
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How to implement an STL-style iterator and avoid common pitfalls?
... size))
{
std::cout << " char: " << static_cast<char>(n) << std::endl;
}
}
{
// Only for iterator test
ptr_iterator<uint8_t> first(data);
ptr_iterator<uint8_t> last(first + size);
std::vector<u...
How to implement a custom AlertDialog View
...
This gives a ClassCastException when the custom layout contains an EditText, because getCurrentFocus() will return the EditText and an EditText can't be cast to a ViewGroup. Using null as the second argument fixes this.
–...
What is a NullReferenceException, and how do I fix it?
...design philosophy, would at least resolve the NullReferenceException here.
Cast with as
var myThing = someObject as Thing;
This doesn't throw an InvalidCastException but returns a null when the cast fails (and when someObject is itself null). So be aware of that.
LINQ FirstOrDefault() and SingleOrD...
What is the difference between char s[] and char *s?
...
static char __unnamed[] = "abc";
char *c = __unnamed;
Note the implicit cast from char[] to char *, which is always legal.
Then if you modify c[0], you also modify __unnamed, which is UB.
This is documented at 6.4.5 "String literals":
5 In translation phase 7, a byte or code of value zero i...
How to load JAR files dynamically at Runtime?
...ustom loader.
To add jars just call ClassLoader.getSystemClassLoader() and cast it to your class.
Check out this implementation for a carefully crafted classloader. Please note, you can change the add() method to public.
sha...
What is the preferred/idiomatic way to insert into a map?
... in make_pair() really request another function call? It seems an implicit cast would suffice which compiler should be happy to do so.
– galactica
Nov 15 '18 at 0:47
add a com...
What is the difference between an int and an Integer in Java and C#?
... you can access methods on the heap object directly, but in C# you need to cast it back to an int, which will create another copy. Thus, the object on the heap cannot easily be changed in C# without creating a new boxed copy of a new int value. (Ugh, this paragraph doesn't read all that easily.)
...
What exactly do “IB” and “UB” mean?
...by the compiler writers. An example of this is the result of a reinterpret_cast. usually, it simply changes the type of a pointer, without modifying the address, but the mapping is actually implementation-defined, so a compiler could map to a completely different address, as long as it documented th...