[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/SimDeviceSim.cpp

@@ -0,0 +1,47 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2019-2020 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/SimDeviceSim.h"
+
+#include <string>
+#include <vector>
+
+#include <hal/SimDevice.h>
+#include <hal/simulation/SimDeviceData.h>
+
+using namespace frc;
+using namespace frc::sim;
+
+SimDeviceSim::SimDeviceSim(const char* name)
+    : m_handle{HALSIM_GetSimDeviceHandle(name)} {}
+
+hal::SimValue SimDeviceSim::GetValue(const char* name) const {
+  return HALSIM_GetSimValueHandle(m_handle, name);
+}
+
+hal::SimDouble SimDeviceSim::GetDouble(const char* name) const {
+  return HALSIM_GetSimValueHandle(m_handle, name);
+}
+
+hal::SimEnum SimDeviceSim::GetEnum(const char* name) const {
+  return HALSIM_GetSimValueHandle(m_handle, name);
+}
+
+hal::SimBoolean SimDeviceSim::GetBoolean(const char* name) const {
+  return HALSIM_GetSimValueHandle(m_handle, name);
+}
+
+std::vector<std::string> SimDeviceSim::GetEnumOptions(hal::SimEnum val) {
+  int32_t numOptions;
+  const char** options = HALSIM_GetSimValueEnumOptions(val, &numOptions);
+  std::vector<std::string> rv;
+  rv.reserve(numOptions);
+  for (int32_t i = 0; i < numOptions; ++i) rv.emplace_back(options[i]);
+  return rv;
+}
+
+void SimDeviceSim::ResetData() { HALSIM_ResetSimDeviceData(); }