compile_time_member_check.h

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#pragma once
 
#include <type_traits>
 
#define HAS_MEMBER(X)                    \
  template <typename T, typename = void> \
  struct has_##X : std::false_type {};   \
  template <typename T>                  \
  struct has_##X<T, decltype((void)T::X, void())> : std::true_type {};