simplify trait using concept

Author: alxbilger

Sofa/framework/Helper/src/sofa/helper/SelectableItem.h

@@ -252,16 +252,9 @@ class SelectableItem : public BaseSelectableItem
         return static_cast<id_type>(-1);
     }
 
-    template <typename, typename = std::void_t<>>
-    struct has_deprecation_map : std::false_type {};
-
-    // Specialization when T has a static member s_foo
-    template <typename T>
-    struct has_deprecation_map<T, std::void_t<decltype(T::s_deprecationMap)>> : std::true_type {};
-
     void keyError(const std::string_view key)
     {
-        if constexpr (has_deprecation_map<Derived>::value)
+        if constexpr (requires {Derived::s_deprecationMap;})
         {
             static_assert(std::is_same_v<std::remove_cv_t<decltype(Derived::s_deprecationMap)>, std::map<std::string_view, DeprecatedItem>>);
             const auto it = Derived::s_deprecationMap.find(key);