is_class.hpp

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// ArduinoJson - https://arduinojson.org
// Copyright © 2014-2023, Benoit BLANCHON
// MIT License
 
#pragma once
 
#include "declval.hpp"
 
template< typename T >
struct is_class
{
protected:  // <- to avoid GCC's "all member functions in class are private"
  template< typename U >
  static int probe(void (U::*)(void));
  template< typename >
  static char probe(...);
 
public:
  static const bool value = sizeof(probe< T >(0)) == sizeof(int);
};