On 04/22/09 11:19, Larry Evans wrote:
On 04/21/09 11:36, Larry Evans wrote:
On 04/15/09 11:39, Larry Evans wrote: [snip]
The following zip file in the vault's variadic_template directory:
[snip]
There's now in the same vault directory, while.cpp. This demonstrates how a while_ template can be used with an explicit stack to avoid the problems of iter_fold_if accessing the end iterator. The exlicit stack is the 3ird parameter to:
template < typename Iter , typename State , typename Stack > struct forward_state ;
This stack is built up during the 1st while_ instantiation and then that stack is traversed during the 2nd while_ instantiation. [snip]
However, the if_recur template attached to a previous post: http://article.gmane.org/gmane.comp.lib.boost.devel/188322 could be used to accomplish the same task. The Else parameter to if_recur could be another ir_recur. The outer if_recur would perform the task of the 1st while (building up the stack as well as building the state) and the Else if_recur would perform the task of the 2nd while. At least I think so. I haven't tried it yet. Is there any interest? -regards, Larry