Is it possible in C++ to create a new object at a specific memory location? I have a block of shared memory in which I would like to create an object. Is this possible?
6 Answers
Assuming you have a pointer to the memory location you're wanting to place an object at, I believe one can cast the pointer to a new type and then place an object at the location of that pointer. This is a solution which doesn't require new().
Given your memory:
// you would use the pointer you have to your allocation of memory
char* mem_start = new char[1024]; // Now we have 1024 bytes to play with
One can cast it to a given type:
CustomType* object_ptr = (CustomType*) mem_start;
Lastly, you can construct an object there:
*(object_ptr) = CustomType();
int *ptr=(int *)0x1234;
classname *objname = new (ptr) classname;
You can do it by simple doing this.
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