boxing Questions
6
Solved
Boxing converts a value type to an object type. Or as MSDN puts it, boxing is an "operation to wrap the struct inside a reference type object on the managed heap."
But if you try to drill into tha...
Speedwriting asked 12/9, 2011 at 15:4
1
Solved
Consider the following class:
package test
class Test {
def main(args: Array[String]): Unit = {
val i: Int = 0
println(i)
}
}
The bytecode of main is:
public main([Ljava/lang/String;)V
// ...
4
I recently came across this Stackoverflow question: When to use struct?
In it, it had an answer that said something a bit profound:
In addition, realize that when a struct implements an interfa...
Gymnosperm asked 4/3, 2013 at 17:21
1
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In C#, there are structs and classes. Structs are usually (i.e. there are exceptions) stack allocated and classes are always heap allocated. Class instances, therefore, put pressure on the GC and a...
Saimon asked 11/8, 2017 at 12:13
1
Solved
While doing some profiling on one of our applications, I found this code:
public TOut GetValue<TIn, TOut>(Func<TIn> getter)
{
var value = getter();
// Do some stuff with the value
...
3
Solved
Please help me understand this piece of code in the kotlin docs:-
val a: Int = 10000
print(a === a) // Prints 'true'
val boxedA: Int? = a
val anotherBoxedA: Int? = a
print(boxedA === anotherBoxedA...
Distiller asked 17/7, 2017 at 8:30
1
Solved
The Perl 6 docs list a bunch of types. Some of them, such as Str, have more complicated box/unbox behaviors.
Is it possible to define my own type, specifying my own routines for the box/unboxing? ...
Concordia asked 6/5, 2017 at 14:10
3
Solved
Do boxing and unboxing has the same performance hit? Or is unboxing faster, let's say?
(If yes, can you briefly explain the main reason.)
2
Solved
class C<T> where T : struct {
bool M1(object o) => o is T;
bool M2(object o) => o is T?;
}
The two methods above seems to behave equally, both when passing null reference or boxed T...
5
Solved
Integer i = null;
if (i == 3)
Why the second line above throws a NullPointerException, IMHO, this has only one meaning which is Wrapper Object i is to be unboxed which yields the Exception such a...
Prerecord asked 7/2, 2012 at 14:1
2
Solved
This code is shown in The Rust Programming Language:
#![feature(box_syntax, box_patterns)]
fn main() {
let b = Some(box 5);
match b {
Some(box n) if n < 0 => {
println!("Box contains ne...
Capitulate asked 11/2, 2017 at 14:50
1
Solved
I am asking this for performance sake - using lots of boxing makes lots of heap allocations which brings more GC collects which sometimes causes apps to freeze for a glimpse which annoy users.
Locker asked 19/10, 2016 at 14:8
1
Solved
3
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I have some non-copyable type and a function that consumes and (maybe) produces it:
type Foo = Vec<u8>;
fn quux(_: Foo) -> Option<Foo> {
Some(Vec::new())
}
Now consider a type t...
Nameplate asked 15/7, 2016 at 13:17
2
Solved
3
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I'm new to programming,
As per MSDN,
Boxing is the process of converting a value type to the type object or to any interface type implemented by this value type. When the CLR boxes a value type...
4
Solved
I have a piece of code which I need to understand:
public static void main(String[] args) {
Character c = new Character('a');
Character cy = new Character('a');
char cx = 'a';
System.out.prin...
3
Solved
I am sure my question doesn't make sense, but it's because I don't know what I am seeing or how to describe it...
The following code compiles fine, but it shouldn't because int is not the same ty...
2
Solved
I'm wondering how you could compare two boxed integers (either can be signed or unsigned) to each other for equality.
For instance, take a look at this scenario:
// case #1
object int1 = (int)50...
1
Solved
Say I have the following code:
Map<String, Boolean> map = ...
map.put("foo", true);
Theoretically, true will have to be autoboxed, resulting in a slight performance hit versus inserting Bo...
Pseudohermaphroditism asked 8/1, 2016 at 23:8
4
Solved
What is the difference between Boxing and AutoBoxing in Java? Several Java Certification books use two such terms. Do they refer to the same thing that is Boxing?
4
I'm comparing two pieces of code
Integer x = new Integer(0), y;
y=x;
x+=0;
System.out.println(x==y); // prints false
And
Integer x = 0, y;
y=x;
x+=0;
System.out.println(x==y); // prints true
...
1
Solved
I'm currently trying to convert an
Expression<Func<T,object>>
to an
Expression<Func<T,bool>>
Currently the watch shows me that my expression holds
Expression<Fu...
Saprogenic asked 17/11, 2015 at 9:38
6
Solved
Very simple question:
int a = 5;
string str = a.ToString();
Since ToString is a virtual method of System.Object, does it mean that everytime I call this method for integer types, a boxing occurs...
1
Solved
As per the C# specs, is there any guarantee that foo.Bar would have the same effect of being atomic (i.e. reading foo.Bar from different threads would never see a partially updated struct when writ...
Cousteau asked 23/9, 2015 at 0:3
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