How to Let the Compiler Declare the Type of a Variable for Later Initialization by a Function

MS Physics Drake University
BA Mathematics Dominican University
Wrote world's first user configurable binary file editor utilizing templates to specify file structure id est to wit in particular to be specific "FileRay" unfortunately not a commercial success. Some years later Sweetscape did a better job w/ "010 Editor" and seems to be a success.
Enjoy physical simulation. Did some work in this regard in astro-physics and options market making.

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