finally.hpp

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#pragma once
#include "unused.hpp"
#include <exception>
#include <utility>

namespace xtd {
  struct finally {};
  
  template<typename function_t>
  struct __xtd_finally_object__ {
    __xtd_finally_object__(function_t&& f) : function(std::forward<function_t>(f)) {}
    ~__xtd_finally_object__() { function(); }
    function_t function;
  };
  
  template<typename function_t>
  auto operator +(finally, function_t&& function) {
    return __xtd_finally_object__<function_t> {std::forward<function_t>(function)};
  }
}

#define finally_ \
  [[maybe_unused]] auto __ = xtd::finally {} + [&]