placement new + array +alignment

Question

SomeObj* Buffer;
char* BufferPtr = MemoryManager::giveMeSomeBytes(resX*resY*sizeof(SomeObj));
Buffer = new(BufferPtr) SomeObj         


        

Answer 1

As others have said, this is due to your C++ implementation storing the size of the array at the start of the buffer you pass to array placement new.

An easy fix for this is to simply assign your array pointer to the buffer, then loop over the array and use regular (non-array) placement new to construct each object in the buffer.