pointers - C++ dynamic two dimension array declaration

Question

With C++11, we can use

auto carrots{new double[rows][4]}

if we want to allocate dynamic two dimension array. Here I see another way to explicitly declare the pointer like

double (*carrots)[4]{new double[rows][4]} 

According to my understanding, double (*carrots)[4] is a pointer to an array of double[4]. I think there should be a mismatch between this and new double[rows][4]. Because I think double[rows][4] represents an array of size rows instead of array of size 4.

As we know the lay out of c++ two dimension array should like this

int test[3][2] {{0,1},{2,3},{4,5}}

is exactly the same as

int test[6]{0,1,2,3,4,5}

question from:https://stackoverflow.com/questions/65878150/c-dynamic-two-dimension-array-declaration

Answer 1

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