从交错数组转换为加倍在C＃中的指针 [英] Converting from a jagged array to double pointer in C#

问题描述

在这里简单的问题：有没有办法从一个交错数组转换为双指针？

Simple question here: is there any way to convert from a jagged array to a double pointer?

例如。转换双击[] [] 到双**

这不能做只是遗憾的是铸造（因为它可以在普通的旧C），很遗憾。使用固定语句似乎并不要么解决问题。是否有任何（preferably尽可能高效）的方式在C＃中做到这一点？我怀疑解决方案可能不是很明显的是，虽然我希望仍然直白。

This can't be done just by casting unfortunately (as it can in plain old C), unfortunately. Using a fixed statement doesn't seem to resolve the problem either. Is there any (preferably as efficient as possible) way to accomplish this in C#? I suspect the solution may not be very obvious at all, though I'm hoping for a straightforward one nonetheless.

推荐答案

一个双重[] []是一个数组双[]，而不是双*的，因此要获得一个双**，我们首先需要一个双* []

A double[][] is an array of double[], not of double* , so to get a double** , we first need a double*[]

double[][] array = //whatever
//initialize as necessary

fixed (double* junk = &array[0][0]){

    double*[] arrayofptr = new double*[array.Length];
    for (int i = 0; i < array.Length; i++)
        fixed (double* ptr = &array[i][0])
        {
            arrayofptr[i] = ptr;
        }

    fixed (double** ptrptr = &arrayofptr[0])
    {
        //whatever
    }
}

我不禁想知道这是，如果有不是需要双指针更好的解决方案。

I can't help but wonder what this is for and if there is a better solution than requiring a double-pointer.

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