what is equivalent of 'calloc' in C++?

my code line is like below

_set_ptr(TABLEID, i, calloc(qty, sizeof(double)));

where TABLEID and i and qty are int type and _set_ptr is a void type function which return NULL.

this is function's declaration

void _set_ptr(int TABLEID, int index, char* ptr)

When I compile it by use of arm g++ tool chain it give me error as below

error:   initializing argument 3 of 'void _set_ptr(int, int, char*)' [-fpermissive]

As per malloc I use new which equivalent to it, as below

_set_ptr(TABLEID, i, new double[qty]);  

but also it give error as below

error: cannot convert 'double*' to 'char*' for argument '3' to 'void _set_ptr(int, int, char*)'

So, Is there any equivalent to calloc in c++ ?

How can I replace it ? And how this new line's syntax will become?

Thanks