is_base_of.hpp

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// ArduinoJson - https://arduinojson.org
// Copyright © 2014-2024, Benoit BLANCHON
// MIT License
 
#pragma once
#include "remove_reference.hpp"
 
// A meta-function that returns true if Derived inherits from TBase is an
// integral type.
template< typename TBase, typename TDerived >
class is_base_of {
protected:  // <- to avoid GCC's "all member functions in class are private"
  static int probe(const TBase*);
  static char probe(...);
 
public:
  static const bool value =
      sizeof(probe(reinterpret_cast<remove_reference_t<TDerived>*>(0))) ==
      sizeof(int);
};