There are essentially three kinds of ‘function calls’: Pass by value Pass by reference Pass by object reference Python is a PASS-BY-OBJECT-REFERENCE programming language. Firstly, it is important to understand that a variable, and the value of the variable (the object) are two seperate things. The variable ‘points to’ the object. The variable is not … Read more
Is there a name to describe this idiom? In UML it is called aggregation. It differs from composition in that the member object is not owned by the referring class. In C++ you can implement aggregation in two different ways, through references or pointers. I am assuming it is to prevent the possibly large overhead … Read more
Check your build types of each project under project properties – I bet one or the other will be set to build against .NET XX – Client Profile. With inconsistent versions, specifically with one being Client Profile and the other not, then it works at design time but fails at compile time. A real gotcha. … Read more
Restart Eclipse (unfortunately) and the problem will go away.
Arrays have full value semantics in Swift, so there’s no need for anything fancy. var duplicateArray = originalArray is all you need. If the contents of your array are a reference type, then yes, this will only copy the pointers to your objects. To perform a deep copy of the contents, you would instead use … Read more
You would want to pass a pointer by reference if you have a need to modify the pointer rather than the object that the pointer is pointing to. This is similar to why double pointers are used; using a reference to a pointer is slightly safer than using pointers.
If you’re coming from C/C++, it might also be helpful to think of it basically like this: // Rust C/C++ a: &T == const T* const a; // can’t mutate either mut a: &T == const T* a; // can’t mutate what is pointed to a: &mut T == T* const a; // can’t mutate … Read more
The important difference is that when passing by const reference, no new object is created. In the function body, the parameter is effectively an alias for the object passed in. Because the reference is a const reference the function body cannot directly change the value of that object. This has a similar property to passing … Read more
static means that the variable or method marked as such is available at the class level. In other words, you don’t need to create an instance of the class to access it. public class Foo { public static void doStuff(){ // does stuff } } So, instead of creating an instance of Foo and then … Read more
The short & direct answer: no, use the array index instead of the value So the above code becomes: package main import “fmt” type MyType struct { field string } func main() { var array [10]MyType for idx, _ := range array { array[idx].field = “foo” } for _, e := range array { fmt.Println(e.field) … Read more