Call Once
(src/sys/call_once.hpp)

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• Last update: 2021-05-16 13:37:12+09:00
• Include: #include "src/sys/call_once.hpp"

Code

#pragma once

/**
 * @file call_once.hpp
 * @brief Call Once
 */

#include <unordered_set>

namespace workspace {

/**
 * @brief Call once.
 */
template <class _F> void call_once(_F &&__f) {
  static std::unordered_set<void *> __called;
  if (__called.count(std::addressof(__f))) return;
  __called.emplace(std::addressof(__f));
  __f();
}

}  // namespace workspace

#line 2 "src/sys/call_once.hpp"

/**
 * @file call_once.hpp
 * @brief Call Once
 */

#include <unordered_set>

namespace workspace {

/**
 * @brief Call once.
 */
template <class _F> void call_once(_F &&__f) {
  static std::unordered_set<void *> __called;
  if (__called.count(std::addressof(__f))) return;
  __called.emplace(std::addressof(__f));
  __f();
}

}  // namespace workspace

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