Reimplemented `Find` in terms of `ListIndex`

* `ListIndex` already implements the necessary partial template specializations for finding elements matching a predicate
* reimplemented `Cond` using `detail::find_variadic` as `Find` depends on `Apply` which in turn depends on `Cond`
** it is useful if core functionality such as the branched conditional `Cond` do not require higher order functionality such as `Find`
*** otherwise one can not use core functionality in the implementation of higher order functionality
* introduced `utility::predicate_guard` helper template
** checks a given value using a predicate and only forwards the value to the guarded function if this check is successful
** if check is unsuccessful it returns a surrogate value simmilar to `utility::predicate_assurance`

1 files changed, 3 insertions, 3 deletions

diff --git a/src/list/detail/fold_variadic.h b/src/list/detail/fold_variadic.h
index e02b604..2b4fdd8 100644
--- a/src/list/detail/fold_variadic.h
+++ b/src/list/detail/fold_variadic.h
@@ -21,10 +21,10 @@ struct fold_variadic {
 
 template <
 	template <typename, typename> class Function,
-	typename                            Head
+	typename                            Last
 >
-struct fold_variadic<Function, Head> {
-	typedef Function<Head, void> type;
+struct fold_variadic<Function, Last> {
+	typedef Function<Last, void> type;
 };
 
 }