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Co-authored-by: Julien Jerphanion <git@jjerphan.xyz>
man-group · Apr 5, 2024 · 2efac9c · 2efac9c
1 parent 1bd7f2b
commit 2efac9c
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/include/sparrow/mp_utils.hpp b/include/sparrow/mp_utils.hpp
@@ -46,13 +46,14 @@ namespace sparrow::mpl
  template< typename TList >
  concept any_typelist = is_type_instance_of_v<TList, typelist>;
 
- // TODO: document this!
  template <class T, bool is_const>
  struct constify
  : std::conditional<is_const, const T, T>
  {
  };
 
+ // `constify_t` is required since `std::add_const_t<T&>`
+ // is not `const T&` but `T&`.
  template <class T, bool is_const>
  using constify_t = typename constify<T, is_const>::type;