Calling a variadic function with an unknown number of parameters

Question

Say I have a function that takes a variable number of parameters: I want to call this function from somewhere else, building the list of parameters, but without knowing in a

Answer 1

If a special value cannot be reserved to indicate the end of the list, pass 2 arguments for each parameter. Tad wasteful but does allow code to be sequentially automatically generated without value restrictions.

foo(0);
foo(1, Params1, 0);
foo(1, Params1, 1, Params2, 0);
foo(1, Params1, 1, Params2, 1, Params3, 0);