unique_handle.hpp

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#pragma once
 
#ifdef _WIN32
#  include "windows_api.hpp"
 
namespace threadschedule::detail
{
 
class unique_handle
{
public:
  unique_handle() noexcept = default;
  explicit unique_handle(HANDLE handle) noexcept : handle_(handle) {}
 
  unique_handle(unique_handle const&) = delete;
  auto operator=(unique_handle const&) -> unique_handle& = delete;
 
  unique_handle(unique_handle&& other) noexcept : handle_(other.release()) {}
 
  auto
  operator=(unique_handle&& other) noexcept -> unique_handle&
  {
    if (this != &other)
      reset(other.release());
    return *this;
  }
 
  ~unique_handle()
  {
    reset();
  }
 
  [[nodiscard]] auto
  get() const noexcept -> HANDLE
  {
    return handle_;
  }
 
  [[nodiscard]] explicit
  operator bool() const noexcept
  {
    return handle_ != nullptr && handle_ != INVALID_HANDLE_VALUE;
  }
 
  [[nodiscard]] auto
  release() noexcept -> HANDLE
  {
    auto* value = handle_;
    handle_ = nullptr;
    return value;
  }
 
  void
  reset(HANDLE handle = nullptr) noexcept
  {
    if (handle_ == handle)
      return;
    if (*this)
      CloseHandle(handle_);
    handle_ = handle;
  }
 
private:
  HANDLE handle_{ nullptr };
};
 
} // namespace threadschedule::detail
#endif