how to copy all elements of a 2d array to another 2d array?

Question

_{Sunday, February 25, 2007 6:50 PM}

I just know the copyTo function is only suitable for 1-d array . But how about 2-d array? is there any faster and easier method that can copy all elements to another 2d array without using any loops to go through each elements? thanks!!

All replies (4)

_{Monday, February 26, 2007 3:56 AM ✅Answered}

I guess you mean to use memcpy to copy the massive of memory space for a 2-d array to another memory space that has already allocated correctlly. For example:

int a[2][5],b[2][5];

for(int i=0;i<2;i++)

     for(int j=0;j<5;j++)

         a[j] = i+j;

memcpy(b,a,sizeof(a)); // This will copy entire a to b

Be careful that b has been allocated with enough space.

Is this what you want?

regards,

rico

_{Sunday, February 25, 2007 7:35 PM}

I need more context. Could you provide a reference to the copyTo function.  Thanks.

_{Sunday, February 25, 2007 9:40 PM}

Boost.org has a multidimensional class. I don't know for sure that it has a copy function such as you need but I assume it does.

_{Monday, February 26, 2007 12:13 PM}

yeah thz rico thats what i want ...

is that is just simply type this line of code memcpy(b,a,sizeof(a));

do i need to include any class or anything else?

thanks~