如何在自定义表达式求值程序中检测循环逻辑或递归？

I've written an experimental function evaluator that allows me to bind simple functions together such that when the variables change, all functions that rely on those variables (and the functions that rely on those functions, etc.) are updated simultaneously. The way I do this is instead of evaluating the function immediately as it's entered in, I store the function. Only when an output value is requested to I evaluate the function, and I evaluate it each and every time an output value is requested.I've written an experimental function evaluator