refactor: Simplify namespace structure for numeric conversion functions

Author: FrozenLemonTee

src/conversion/underlying.cppm

@@ -268,7 +268,7 @@ constexpr auto exact_rep_cast(SrcRep value)
 
 } // namespace mcpplibs::primitives::conversion::details
 
-export namespace mcpplibs::primitives::conversion::underlying {
+export namespace mcpplibs::primitives::conversion {
 
 template <details::integral_like DestRep, details::integral_like SrcRep>
 constexpr auto numeric_risk(SrcRep value)
@@ -417,4 +417,4 @@ constexpr auto exact_cast(Src value) -> cast_result<Dest> {
   return underlying::traits<dest_type>::from_rep(*target_rep);
 }
 
-} // namespace mcpplibs::primitives::conversion::underlying
+} // namespace mcpplibs::primitives::conversion

src/operations/operators.cppm

@@ -542,7 +542,7 @@ constexpr auto apply_assign(Lhs &lhs, Rhs const &rhs)
   if constexpr (std::same_as<lhs_value_policy, policy::value::checked> &&
                 std::integral<lhs_rep>) {
     if (auto const kind =
-            conversion::underlying::numeric_risk<lhs_rep>(
+            conversion::numeric_risk<lhs_rep>(
                 assigned_common);
         kind.has_value()) {
       return std::unexpected(
@@ -552,7 +552,7 @@ constexpr auto apply_assign(Lhs &lhs, Rhs const &rhs)
   }
 
   auto const assigned_rep =
-      conversion::underlying::saturating_cast<lhs_rep>(assigned_common);
+      conversion::saturating_cast<lhs_rep>(assigned_common);
   lhs.store(underlying::traits<lhs_value_type>::from_rep(assigned_rep));
   return out;
 }

src/primitive/impl.cppm

@@ -64,7 +64,7 @@ private:
 
     auto const source_rep = underlying::traits<source_value_type>::to_rep(source);
     auto const target_rep =
-        conversion::underlying::saturating_cast<target_rep_type>(
+        conversion::saturating_cast<target_rep_type>(
             static_cast<source_rep_type>(source_rep));
     return underlying::traits<std::remove_cv_t<Target>>::from_rep(target_rep);
   }