I know the title sounds familiar as there are many similar questions, but I’m asking for a different aspect of the problem (I know the difference between having things on the stack and putting them on the heap). In Java I can always return references to “local” objects public Thing calculateThing() { Thing thing = … Read more
I know that “string” in C# is a reference type. This is on MSDN. However, this code doesn’t work as it should then: class Test { public static void Main() { string test = “before passing”; Console.WriteLine(test); TestI(test); Console.WriteLine(test); } public static void TestI(string test) { test = “after passing”; } } The output should … Read more
This question already has answers here: How do I clone a list so that it doesn’t change unexpectedly after assignment? (21 answers) Closed 4 years ago. Let’s take an example a=[‘help’, ‘copyright’, ‘credits’, ‘license’] b=a b.append(‘XYZ’) b [‘help’, ‘copyright’, ‘credits’, ‘license’, ‘XYZ’] a [‘help’, ‘copyright’, ‘credits’, ‘license’, ‘XYZ’] I wanted to append value in list … Read more
I wrote some Rust code that takes a &String as an argument: fn awesome_greeting(name: &String) { println!(“Wow, you are awesome, {}!”, name); } I’ve also written code that takes in a reference to a Vec or Box: fn total_price(prices: &Vec<i32>) -> i32 { prices.iter().sum() } fn is_even(value: &Box<i32>) -> bool { **value % 2 == … Read more
I was reading the answers to this question C++ pros and cons and got this doubt while reading the comments. programmers frequently find it confusing that “this” is a pointer but not a reference. another confusion is why “hello” is not of type std::string but evaluates to a char const* (pointer) (after array to pointer … Read more
I have read this article about different types of references in Java (strong, soft, weak, phantom), but I don’t really understand it. What is the difference between these reference types, and when would each type be used? 7 Answers 7
This question already has answers here: How do you do a deep copy of an object in .NET? [duplicate] (10 answers) Closed 2 years ago. Please have a look at the code below (excerpt from a C# book): public class MyClass { public int val; } public struct myStruct { public int val; } public … Read more
Why does the first return a reference? int x = 1; int y = 2; (x > y ? x : y) = 100; While the second does not? int x = 1; long y = 2; (x > y ? x : y) = 100; Actually, the second did not compile at all – … Read more
I’m having a little trouble understanding the pass-by-reference properties of data.table. Some operations seem to ‘break’ the reference, and I’d like to understand exactly what’s happening. On creating a data.table from another data.table (via <-, then updating the new table by :=, the original table is also altered. This is expected, as per: ?data.table::copy and … Read more
When writing xml documentation you can use <see cref=”something”>something</see>, which works of course. But how do you reference a class or a method with generic types? public class FancyClass<T> { public string FancyMethod<K>(T value) { return “something fancy”; } } If I was going to write xml documentation somewhere, how would I reference the fancy … Read more