Home Backend Development Golang Understanding passing by reference in Go language

Understanding passing by reference in Go language

Apr 03, 2024 pm 01:12 PM
go go language pass by reference

在 Go 中,传递引用类型变量时发生引用传递,其中 * 符号表示引用类型。传递引用类型变量时,实际上传递的是指向原始值的地址,修改引用类型变量会影响原始值。

Understanding passing by reference in Go language

认识 Go 语言中的引用传递

引言

在 Go 语言中,变量可以存储两种类型的值:值类型和引用类型。值类型存储实际值,而引用类型存储指向实际值的地址。当传递引用类型变量时,就会发生引用传递。

引用传递的基础知识

在 Go 语言中,使用 * 符号来表示一个引用类型。例如:

type Point struct {
    x int
    y int
}

func main() {
    var p1 = Point{1, 2}
}
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在上面的代码中,p1 是一个对 Point 结构的引用。当您传递一个引用类型的变量时,您实际上是在传递指向原始值的地址。

实战案例

考虑以下示例:

func changePoint(p *Point) {
    p.x = 10
    p.y = 20
}

func main() {
    var p1 = Point{1, 2}
    changePoint(&p1)
    fmt.Println(p1) // 输出:{10 20}
}
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changePoint 函数中,我们通过指针接收了一个对 Point 结构的引用。然后,我们修改了指针引用的实际值。由于我们已经修改了原始值,因此在 main 函数中打印 p1 时,它将显示更新后的值。

注意事项

  • 当您传递一个引用类型的变量时,您需要确保指针始终指向有效的内存地址。
  • 修改引用类型变量将影响原始值,因此请谨慎修改。
  • 为了避免对原始值造成意外更改,您可以创建引用类型的副本并修改副本。

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