How to use golang generics

The use of golang generics can be replaced by the following methods: 1. Using interfaces. By defining interfaces and using interface types as parameters or return types in functions or methods, abstract operations on different types can be achieved; 2. , Code generation tools generate specific types of code to achieve generic behavior, but the template code needs to be defined in advance and the template code can be converted into specific types of code through the generation tool.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

The use of golang generics can be replaced by the following methods:

1. Use interfaces: In Go, interfaces are a flexible mechanism that can be implemented to some extent through interfaces Generic behavior. Abstract operations on different types can be achieved by defining interfaces and using interface types as parameters or return types in functions or methods.

type MyGeneric interface {
    DoSomething()
}

func ProcessGeneric(g MyGeneric) {
    // 对泛型进行处理
    g.DoSomething()
}

2. Code generation tools: Code generation tools such as go generate and goimports can be used to generate specific types of code to achieve generic behavior. This method requires defining the template code in advance and converting the template code into specific types of code through a generation tool.

//go:generate go run gen.go

func ProcessGeneric(g GenericType) {
    // 处理泛型
}

// gen.go
package main

import (
    "fmt"
    "os"
    "text/template"
)

type GenericType int

func main() {
    tmpl := template.Must(template.New("").Parse(`
type GenericType {{.}}
`))

    types := []string{"int", "string", "float64"}

    for _, t := range types {
        f, err := os.Create(fmt.Sprintf("generic_%s.go", t))
        if err != nil {
            fmt.Println(err)
            continue
        }
        defer f.Close()
        tmpl.Execute(f, t)
    }
}

In this example, we create a GenericType template and use the code generation tool to generate specific code files based on different types (int, string, float64).

It should be noted that the above method is a compromise solution and is not an officially supported generic implementation. The Go language team is in the process of developing generics and may launch official generic support in the future.

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