The use of interfaces in go language

Release: 2019-11-29 15:24:23
forward
2876 people have browsed it

The use of interfaces in go language

In Go, the meaning of interface is no different from that of interfaces in other languages. Interface is understood as a type of specification or convention. Does a type "implement" an interface? It depends on whether this type implements all methods defined in the interface. (Recommended: go language tutorial)

1. The definition and use of interfaces.

For example,

type I interface{
    Get() int
    Put(int)
 
}
Copy after login

This paragraph defines an interface, which contains two functions Get and Put

Okay, one of my interfaces This interface is implemented:

type S struct {val int}
func (this *S) Get int {
    return this.val
}
func (this *S)Put(v int) {
    this.val = v
 
}
Copy after login

This structure S is the implementation of interface I

2, empty interface

For empty Interface interface{} is actually very similar to the concept of generics. Any type implements the empty interface.

The following is an example:

A function implements such a function:

Take any object as a parameter. If the object implements interface I, then call interface I The Get method

Many languages ​​have this logic:

function g(obj){
    if (obj is I) {
        return (I)obj.Get()
    }
 
}
Copy after login

This is implemented in Go:

func g(any interface{}) int {
    return any.(I).Get()
 
}
Copy after login

Any.(I) here is very semantic ? "Any object that implements the I interface"

3. How to write interface in Go:

Let's look at a few interface examples:

func SomeFunction(w interface{Write(string)}){
    w.Write("pizza")
 
}
Copy after login

In this example, the interface is directly defined in the parameter, which is very special...

func weirdFunc( i int ) interface{} {
  if i ==  0 {
    return "zero"
  }
  return i;
}
Copy after login

In this example, since it is possible to return string or int, the return value is set to interface , which can be seen in large numbers in Go packages.

The above is the detailed content of The use of interfaces in go language. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:cnblogs.com
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template