是否可以将指针重新解释为维度数组引用?

问题描述

假设我有一些指针，我想将其重新解释为静态维度数组引用:

Suppose I have some pointer, which I want to reinterpret as static dimension array reference:

double *p;
double (&r)[4] = ?(p); // some construct?

// clarify
template< size_t N> void function(double (&a)[N]);
...
 double *p;
function(p); // this will not work.
//  I would like to cast p as to make it appear as  double[N]

可以这样做吗?我该怎么做?

Is it possible to do so? how do I do it?

推荐答案

太丑了:

double arr[4];
double* d = arr;

double (&a)[4] = *static_cast<double(*)[4]>(static_cast<void*>(d));

确保数组类型与指针最初来自的类型相匹配.

Be sure the array type matches what the pointer originally came from.

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