hunk.code_window:   darkThemeText: {
       color: '#D0D0C0',
     },
   });
   ```
  
hunk.labels: keep keep keep keep add
hunk.after_edit: ## Tips
   While you're developing, you may want to change your simulator's or device's appearance.
   - If working with an iOS emulator locally, you can use the `command` + `shift` + `a` shortcut to toggle between light and dark mode.
   - If using a real device or an Android emulator, you can toggle the system dark mode setting in the device's settings.
hunk.file_path: docs/pages/versions/unversioned/sdk/appearance.md
hunk.type: add
file: // Boost.TypeErasure library
  //
  // Copyright 2011 Steven Watanabe
  //
  // Distributed under the Boost Software License Version 1.0. (See
  // accompanying file LICENSE_1_0.txt or copy at
  // http://www.boost.org/LICENSE_1_0.txt)
  //
  // $Id$
  
  #ifndef BOOST_TYPE_ERASURE_PLACEHOLDER_OF_HPP_INCLUDED
  #define BOOST_TYPE_ERASURE_PLACEHOLDER_OF_HPP_INCLUDED
  
  namespace boost {
  namespace type_erasure {
  
  template<class Concept, class T>
  class any;
  
  template<class Concept, class T>
  class param;
  
  /**
   * A metafunction returning the (const/reference qualified) placeholder
   * corresponding  to an @ref any.  It will also work for all bases
   * of @ref any, so it can be applied to the @c Base
   * parameter of @ref concept_interface.
   */
  template<class T>
  struct placeholder_of
  {
  #ifdef BOOST_TYPE_ERASURE_DOXYGEN
      typedef detail::unspecified type;
  #else
      typedef typename ::boost::type_erasure::placeholder_of<
          typename T::_boost_type_erasure_derived_type
      >::type type;
  #endif
  };
  
  /** INTERNAL ONLY */
  template<class Concept, class T>
  struct placeholder_of< ::boost::type_erasure::any<Concept, T> >
  {
      typedef T type;
  };
  
  /** INTERNAL ONLY */
  template<class Concept, class T>
  struct placeholder_of< ::boost::type_erasure::param<Concept, T> >
  {
      typedef T type;
  };
  
  }
  }
  
  #endif
  