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A method of a type can either have a pointer receiver or a value receiver. Further investigations shows that all of the following changes would solve the problem: Hence, the interface must also accept a receiver pointer. I'm just building a simple list using an interface type as parent attribute. The recursion continues, with calling the method on a NIL pointer receiver. Ask Question Asked 2 years, 6 months ago. Another subtlety of interfaces is that an interface definition does not prescribe whether an implementor should implement the interface using a pointer receiver or a value receiver. But there is a caveat here In the above examples, we only worked with the value receiver. There is a subtlety to be noted while implementing interfaces using pointer receivers. Pointer vs Value Receiver in methods while implementing an interface in Go (Golang) Posted on July 18, 2020 July 18, 2020 by admin. In this tutorial we will learn how pointers work in Go and we will also understand how Go pointers differ from pointers in other languages such as C and C++. While methods with interface (value) receivers are clearly not possible, methods with interface pointer receivers (and consequently having interface pointers implement other interfaces) should be possible. Welcome to tutorial no. Currently, methods are not allowed to have an interface receiver or an interface pointer receiver. Reading about value receivers vs pointer receivers across the web and stackoverflow, I understand the basic rule to be: If you don't plan to modify the receiver, and the receiver is relatively small, there is no need for pointers. 3. Implementing interfaces using pointer receivers vs value receivers. Choosing a value or pointer receiver. Declaring pointers; Zero value of a pointer There is a caveat while pointer vs value receiver for methods of a type when that type implements an interface . The second is to avoid copying the value on each method call. A method of a type can either have a pointer receiver or a value receiver. What is a pointer? Pointers and interfaces. The Print() methods accept a receiver pointer. This tutorial has the following sections. Custom errors in golang and pointer receivers. Viewed 4k times 9. Pointer Receiver while implementing an interface. When traversing the list the recursion base test checking this parent attribute against NIL does not work. It is also possible to implement interfaces using pointer receivers. It is to be noted that the pointer receiver can also be used to implement an interface. There are two reasons to use a pointer receiver. 15 in Golang tutorial series. This can be more efficient if the receiver is a large struct, for example. Interface Accepting Address of the Variable. Part 15: Pointers 13 April 2019. When you are given an interface value, there’s no guarantee whether the underlying type is or isn’t a pointer. The first is so that the method can modify the value that its receiver points to. If a method accepts a type value, then the interface must receive a type value; if a method has a pointer receiver, then the interface must receive the address of the variable of the respective type. All the example interfaces we discussed in part 1 were implemented using value receivers. Active 1 year, 7 months ago.

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