scope_exit.h

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#pragma once
#include <utility>
 
namespace xtd {
  struct scope_exit {
  };
  
  template<typename function_t>
  struct __xtd_scope_exit_object__ {
    ~__xtd_scope_exit_object__() { function(); }
    function_t function;
  };
  
  template<typename function_t>
  auto operator +(scope_exit, function_t&& function) {
    return __xtd_scope_exit_object__<function_t>{std::forward<function_t>(function)};
  }
}
 
#define __xtd_scope_exit_cat__(name, line) name##line
#define __xtd_scope_exit_id__(name, line) __xtd_scope_exit_cat__(name, line)
 
#define scope_exit_ [[maybe_unused]] auto __xtd_scope_exit_id__(__xtd__scope_exit__, __LINE__) = xtd::scope_exit {} + [&]