read_guard.hpp

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#pragma once
 
#include <shared_mutex>
 
namespace bricks::detail {
 
template <typename T>
class read_guard {
 public:
  read_guard(const T& this_in, std::shared_mutex& mutex_in) noexcept
      : this_(this_in), mutex_(mutex_in)
  {
    mutex_.lock_shared();
  }
 
  ~read_guard() noexcept { mutex_.unlock_shared(); }
 
  read_guard(const read_guard&) = delete;
  auto operator=(const read_guard&) -> read_guard& = delete;
 
  read_guard(read_guard&&) noexcept = default;
  auto operator=(read_guard&&) noexcept -> read_guard& = default;
 
  auto operator->() const noexcept -> const typename T::value_type* { return &this_; }
 
  auto operator*() const noexcept -> const typename T::value_type& { return this_; }
 
 private:
  const T& this_;
  std::shared_mutex& mutex_;
};
 
}  // namespace bricks::detail