For the second part of your question, see the array page of the manual, which states (quoting) : Array assignment always involves value copying. Use the reference operator to copy an array by reference. And the given example : <?php $arr1 = array(2, 3); $arr2 = $arr1; $arr2[] = 4; // $arr2 is changed, // … Read more
Check if you are referencing an assembly which in turn referencing an old version of unity. For example let’s say you have an assembly called ServiceLocator.dll which needs an old version of Unity assembly, now when you reference the ServiceLocator you should provide it with the old version of Unity, and that makes the problem. … Read more
This can be the result of a .Net framework version incompatibility between two projects. It can happen in two ways: a client profile project referencing a full framework project; or an older framework version targeting a newer framework version For example it will happen when an application is set to target the .Net 4 Client … Read more
Method 1 (using new) Allocates memory for the object on the free store (This is frequently the same thing as the heap) Requires you to explicitly delete your object later. (If you don’t delete it, you could create a memory leak) Memory stays allocated until you delete it. (i.e. you could return an object that … Read more
Let’s look at a simple implementation of this: struct Parent { count: u32, } struct Child<‘a> { parent: &’a Parent, } struct Combined<‘a> { parent: Parent, child: Child<‘a>, } impl<‘a> Combined<‘a> { fn new() -> Self { let parent = Parent { count: 42 }; let child = Child { parent: &parent }; Combined { … Read more
Rust originally did enable LLVM’s noalias attribute, but this caused miscompiled code. When all supported LLVM versions no longer miscompile the code, it will be re-enabled. If you add -Zmutable-noalias=yes to the compiler options, you get the expected assembly: adds: mov eax, dword ptr [rsi] add eax, eax add dword ptr [rdi], eax ret Simply … Read more
In general, returning a reference is perfectly normal and happens all the time. If you mean: int& getInt() { int i; return i; // DON’T DO THIS. } That is all sorts of evil. The stack-allocated i will go away and you are referring to nothing. This is also evil: int& getInt() { int* i … Read more
My understanding is that this is actually very simple: Javascript is always pass by value, but when a variable refers to an object (including arrays), the “value” is a reference to the object. Changing the value of a variable never changes the underlying primitive or object, it just points the variable to a new primitive … Read more
The component type of containers like vectors must be assignable. References are not assignable (you can only initialize them once when they are declared, and you cannot make them reference something else later). Other non-assignable types are also not allowed as components of containers, e.g. vector<const int> is not allowed.
Use reference wherever you can, pointers wherever you must. Avoid pointers until you can’t. The reason is that pointers make things harder to follow/read, less safe and far more dangerous manipulations than any other constructs. So the rule of thumb is to use pointers only if there is no other choice. For example, returning a … Read more