The Vector3.Normalize() method has a pointer receiver, so in order to call this method, a pointer to Vector3 value is required (*Vector3). In your first example you store the return value of Vector3.Minus() in a variable, which will be of type Vector3. Variables in Go are addressable, and when you write diff.Normalize(), this is a … Read more
According to the Go Programming Language Specification: A type implements any interface comprising any subset of its methods and may therefore implement several distinct interfaces. For instance, all types implement the empty interface: interface{} If you search within that document for interface{}, you’ll see quite a few examples of how you can use it to … Read more
Right, there’s a number of things to consider. First up: let’s start with the obvious syntax error in your pointer example: type Employee struct { FirstName *string `json:”name”` Salary *int `json:”salary”` FullTime *bool `json:”fullTime”` } So I’ve moved the asterisk to the type, and I’ve captialized the fields. The encoding/json package uses reflection to set … Read more
First, Go technically has only pass-by-value. When passing a pointer to an object, you’re passing a pointer by value, not passing an object by reference. The difference is subtle but occasionally relevant. For example, you can overwrite the pointer value which has no impact on the caller, as opposed to dereferencing it and overwriting the … Read more
As has already been stated, wrapping brackets around an operand means that that operand is to be dereferenced, as if it were a pointer in C. In other words, the brackets mean that you are reading a value from (or storing a value into) that memory location, rather than reading that value directly. So, this: … Read more
You have a pointer variable which after declaration will be nil. If you want to set the pointed value, it must point to something. Attempting to dereference a nil pointer is a runtime panic, just what you experienced. You may use the builtin new() function to obtain a pointer to a zero-valued int, and then … Read more
The high order bits are reserved in case the address bus would be increased in the future, so you can’t use it simply like that The AMD64 architecture defines a 64-bit virtual address format, of which the low-order 48 bits are used in current implementations (…) The architecture definition allows this limit to be raised … Read more
No. From the Go FAQ: Why is there no pointer arithmetic? Safety. Without pointer arithmetic it’s possible to create a language that can never derive an illegal address that succeeds incorrectly. Compiler and hardware technology have advanced to the point where a loop using array indices can be as efficient as a loop using pointer … Read more
There is a major difference between slices and maps: Slices are backed by a backing array and maps are not. If a map grows or shrinks a potential pointer to a map element may become a dangling pointer pointing into nowhere (uninitialised memory). The problem here is not “confusion of the user” but that it … Read more
The Google Go docs state the following about passing arrays – they say you usually want to pass a slice (instead of a pointer?): Updated: As indicated by @Chickencha’s comment, array slices are references which is why they are efficient for passing. Therefore likely you will want to use the slice mechanism instead of “raw” … Read more