如何投放简单的指针固定大小的多维数组? [英] How to cast simple pointer to a multidimensional-array of fixed size?
问题描述
我有一个函数,它指向一个浮点阵列。根据其他的条件,我知道该指针实际指向的2x2或3x3矩阵。 (其实内存最初是这样分配的,例如浮动M [2] [2])最重要的是我想使这个决心在函数体,而不是函数的参数。
无效calcMatrix(INT脸,浮动* matrixReturnAsArray)
{
//在这里,我宁愿在自然矩阵符号工作
如果(is2x2)
{
// ###铸造matrixReturnAsArray到somethingAsMatrix [2] [2]
somethingAsMatrix [0] [1] = 2.002;
//等。
}
否则,如果(is3x3)
{//等等...
}}
我知道我可以使用模板和其他技术更好地解决这个问题。我的问题实际上是关于如何使这样的投在###评论。工作在C ++中。
浮动(* somethingAsMatrix)[2] =(浮点(*)[2])matrixReturnAsArray;
I have a function that takes a pointer to a floating point array. Based on other conditions, I know that pointer is actually pointing to a 2x2 OR 3x3 matrix. (in fact the memory was initially allocated as such, e.g. float M[2][2] ) The important thing is I want to make this determination in the function body, not as the function argument.
void calcMatrix( int face, float * matrixReturnAsArray )
{
// Here, I would much rather work in natural matrix notation
if( is2x2 )
{
// ### cast matrixReturnAsArray to somethingAsMatrix[2][2]
somethingAsMatrix[0][1] = 2.002;
// etc..
}
else if(is3x3)
{ //etc...
}
}
I am aware that I could use templates and other techniques to better address this problem. My question is really about how to make such a cast at the ### comment. Working in C++.
float (*somethingAsMatrix)[2] = (float (*)[2]) matrixReturnAsArray;
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