ThreadSafeStringCut.h

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#ifndef RecoEgamma_EgammaTools_ThreadSafeStringCut_H
#define RecoEgamma_EgammaTools_ThreadSafeStringCut_H

#include "CommonTools/Utils/interface/StringObjectFunction.h"
#include "CommonTools/Utils/interface/StringCutObjectSelector.h"

#include <mutex>
#include "FWCore/Utilities/interface/thread_safety_macros.h"

/*
 * This class is a simple wrapper around either a StringObjectFunction or
 * StringCutObjectSelector to use them in a thread safe way.
 *
 */

template <class F, class T>
class ThreadSafeStringCut {
public:
  ThreadSafeStringCut(const std::string& expr)  // constructor
      : func_(expr), expr_(expr) {}

  ThreadSafeStringCut(ThreadSafeStringCut&& other) noexcept  // move constructor
      : func_(std::move(other.func_)), expr_(std::move(other.expr_)) {}

  typename std::invoke_result_t<F, T> operator()(const T& t) const {
    std::lock_guard<std::mutex> guard(mutex_);
    return func_(t);
  }

private:
  const F func_;
  const std::string expr_;
  CMS_THREAD_SAFE mutable std::mutex mutex_;
};

#endif