Add move constructors and assignment operators to wpilibc (#1314)

Fixes #898.

wpilibc/src/main/native/cpp/Counter.cpp

@@ -7,6 +7,8 @@
 
 #include "frc/Counter.h"
 
+#include <utility>
+
 #include <hal/HAL.h>
 
 #include "frc/AnalogTrigger.h"
@@ -91,6 +93,29 @@ Counter::~Counter() {
   m_counter = HAL_kInvalidHandle;
 }
 
+Counter::Counter(Counter&& rhs)
+    : ErrorBase(std::move(rhs)),
+      SendableBase(std::move(rhs)),
+      CounterBase(std::move(rhs)),
+      m_upSource(std::move(rhs.m_upSource)),
+      m_downSource(std::move(rhs.m_downSource)),
+      m_index(std::move(rhs.m_index)) {
+  std::swap(m_counter, rhs.m_counter);
+}
+
+Counter& Counter::operator=(Counter&& rhs) {
+  ErrorBase::operator=(std::move(rhs));
+  SendableBase::operator=(std::move(rhs));
+  CounterBase::operator=(std::move(rhs));
+
+  m_upSource = std::move(rhs.m_upSource);
+  m_downSource = std::move(rhs.m_downSource);
+  std::swap(m_counter, rhs.m_counter);
+  m_index = std::move(rhs.m_index);
+
+  return *this;
+}
+
 void Counter::SetUpSource(int channel) {
   if (StatusIsFatal()) return;
   SetUpSource(std::make_shared<DigitalInput>(channel));