[wpilib] Add Pneumatics sim classes (#4033)

wpilibc/src/main/native/include/frc/simulation/SolenoidSim.h

@@ -0,0 +1,42 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#pragma once
+
+#include <memory>
+
+#include "frc/PneumaticsModuleType.h"
+#include "frc/simulation/PneumaticsBaseSim.h"
+
+namespace frc::sim {
+
+class SolenoidSim {
+ public:
+  SolenoidSim(std::shared_ptr<PneumaticsBaseSim> moduleSim, int channel);
+  SolenoidSim(int module, PneumaticsModuleType type, int channel);
+  SolenoidSim(PneumaticsModuleType type, int channel);
+
+  bool GetOutput() const;
+  void SetOutput(bool output);
+
+  /**
+   * Register a callback to be run when the output of this solenoid has changed.
+   *
+   * @param callback the callback
+   * @param initialNotify whether to run the callback with the initial state
+   * @return the {@link CallbackStore} object associated with this callback.
+   * Save a reference to this object; it being deconstructed cancels the
+   * callback.
+   */
+  [[nodiscard]] virtual std::unique_ptr<CallbackStore> RegisterOutputCallback(
+      NotifyCallback callback, bool initialNotify);
+
+  std::shared_ptr<PneumaticsBaseSim> GetModuleSim() const;
+
+ private:
+  std::shared_ptr<PneumaticsBaseSim> m_module;
+  int m_channel;
+};
+
+}  // namespace frc::sim