Moved class-based implementations into `detail` namespace

* while class templates enable e.g. hiding implementation details they also require evaluation via `Eval`
** this clutters up the actual logic and is now hidden behind aliae that perform the evaluation

1 files changed, 1 insertions, 1 deletions

diff --git a/src/pair.h b/src/pair.h
index 20bef4e..8234382 100644
--- a/src/pair.h
+++ b/src/pair.h
@@ -19,7 +19,7 @@ struct Pair : detail::pair_tag {
 };
 
 template <typename Type>
-using IsPair = std::is_base_of<detail::pair_tag, Type>;
+using IsPair = Eval<std::is_base_of<detail::pair_tag, Type>>;
 
 }