Implement a minimal std::function-like callable wrapper in C++ using type erasure via inheritance and a virtual call. Define a template Function<R(Args...)> that can store and invoke any callable (function pointer, lambda with captures, or functor), supports copy/move construction and assignment, operator(), destruction, and a boolean conversion for an empty state. You may ignore small-buffer optimization and heap/memory constraints. Explain exception-safety choices and the time/space costs of invocation and copies compared to the standard library version.