显式设置指针的值

I am writing a mex-file (using C++) that will accept a memory address as an input, and operate on data at that memory address. Because I am forced to use MATLAB as my environment, my program can only accept MATLAB data types as inputs (char, bool, float, double, and int). How can I go about assigning my input value to a pointer?I am writing a mex-file (using C++) that will a