[sim] Move WPILib C++ sim implementations out of line (#2598)

This makes the sim classes consistent with the rest of the WPILibC classes.

wpilibc/src/main/native/cpp/simulation/AnalogOutputSim.cpp

@@ -0,0 +1,59 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2018-2020 FIRST. All Rights Reserved.                        */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "frc/simulation/AnalogOutputSim.h"
+
+#include <memory>
+#include <utility>
+
+#include <hal/simulation/AnalogOutData.h>
+
+#include "frc/AnalogOutput.h"
+
+using namespace frc;
+using namespace frc::sim;
+
+AnalogOutputSim::AnalogOutputSim(const AnalogOutput& analogOutput)
+    : m_index{analogOutput.GetChannel()} {}
+
+AnalogOutputSim::AnalogOutputSim(int channel) : m_index{channel} {}
+
+std::unique_ptr<CallbackStore> AnalogOutputSim::RegisterVoltageCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelAnalogOutVoltageCallback);
+  store->SetUid(HALSIM_RegisterAnalogOutVoltageCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+double AnalogOutputSim::GetVoltage() const {
+  return HALSIM_GetAnalogOutVoltage(m_index);
+}
+
+void AnalogOutputSim::SetVoltage(double voltage) {
+  HALSIM_SetAnalogOutVoltage(m_index, voltage);
+}
+
+std::unique_ptr<CallbackStore> AnalogOutputSim::RegisterInitializedCallback(
+    NotifyCallback callback, bool initialNotify) {
+  auto store = std::make_unique<CallbackStore>(
+      m_index, -1, callback, &HALSIM_CancelAnalogOutInitializedCallback);
+  store->SetUid(HALSIM_RegisterAnalogOutInitializedCallback(
+      m_index, &CallbackStoreThunk, store.get(), initialNotify));
+  return store;
+}
+
+bool AnalogOutputSim::GetInitialized() const {
+  return HALSIM_GetAnalogOutInitialized(m_index);
+}
+
+void AnalogOutputSim::SetInitialized(bool initialized) {
+  HALSIM_SetAnalogOutInitialized(m_index, initialized);
+}
+
+void AnalogOutputSim::ResetData() { HALSIM_ResetAnalogOutData(m_index); }