golang：如何使用 make() function 生成二维切片？

Question

First I declared variable p in one place:首先，我在一个地方声明了变量p ：

var p [2][]int

It's a 2d slice, and size of each dimension should be dynamically determined at run time.它是一个二维切片，每个维度的大小应在运行时动态确定。

Then in another function, I tried to initialize p :然后在另一个 function 中，我尝试初始化p ：

    n1 := ...
    n2 := ...
    p = make([][]int, 2) // syntax error
    p[0] = make([]int, n1) // ok
    p[1] = make([]int, n2) // ok

The syntax error is:语法错误是：

cannot use make([][]int, 2) (value of type [][]int) as [2][]int value in assignment(compiler)

How to fix it?如何解决？ Thanks.谢谢。

Answer 1

The declaration of p here indicates a 2D array.这里的p声明表示一个二维数组。 You can convert it to a 2D Slice:您可以将其转换为 2D 切片：

var p [][]int

This should then work as expected when allocation is done via make() .当通过make()完成分配时，这应该会按预期工作。