[Cpp-Programming] Why would this fail?

I have this piece of code that simply copies one array into another it
worked for a while now it fails what could make this fail?

bits = new BYTE[acc*dwn];
...

bits = flip();

BYTE* bitmap::flip(){

BYTE * temp = new BYTE[acc*dwn];

for (int index=0; index < dwn; index++)
// memcpy(&temp[((dwn-1) - index)*acc],
// &bits[index*acc], acc);

return temp;

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