George Neuner <gneuner2/@/comcast.net> writes: > Yes and no. General continuations, as you describe, are not the > only form continuations take. Nor are they the most common form > used. The most common continuations are function calls and returns. > Upward one-shot continuations (exceptions or non-local returns) are > the next most common form used, even in Scheme. > > Upward continuations can be stack implemented. On many CPU's, using > the hardware stack (where possible) is faster than using heap > allocated structures. For performance, some Scheme compilers go to > great lengths to identify upward continuations and nested functions > that can be stack implemented.
There is a Scheme implementation (I keep forgetting the name) which actually does both: it actually uses the call stack but never returns, and the garbage collection includes the stack. -- David Kastrup, Kriemhildstr. 15, 44793 Bochum -- http://mail.python.org/mailman/listinfo/python-list
