blockparam: added support for external parameter copy

src/modules/controllib/block/BlockParam.cpp

@@ -82,9 +82,10 @@ BlockParamBase::BlockParamBase(Block *parent, const char *name, bool parent_pref
 
 template <class T>
 BlockParam<T>::BlockParam(Block *block, const char *name,
-			  bool parent_prefix) :
+			  bool parent_prefix, T *extern_address) :
 	BlockParamBase(block, name, parent_prefix),
-	_val()
+	_val(),
+	_extern_address(extern_address)
 {
 	update();
 }
@@ -93,12 +94,25 @@ template <class T>
 T BlockParam<T>::get() { return _val; }
 
 template <class T>
-void BlockParam<T>::set(T val) { _val = val; }
+void BlockParam<T>::set(T val)
+{
+	_val = val;
+
+	if (_extern_address != NULL) {
+		*_extern_address = val;
+	}
+}
 
 template <class T>
 void BlockParam<T>::update()
 {
-	if (_handle != PARAM_INVALID) { param_get(_handle, &_val); }
+	if (_handle != PARAM_INVALID) {
+		param_get(_handle, &_val);
+
+		if (_extern_address != NULL) {
+			*_extern_address = _val;
+		}
+	}
 }
 
 template <class T>

src/modules/controllib/block/BlockParam.hpp

@@ -77,7 +77,7 @@ class BlockParam : public BlockParamBase
 {
 public:
 	BlockParam(Block *block, const char *name,
-		   bool parent_prefix = true);
+		   bool parent_prefix = true, T *extern_address = NULL);
 	T get();
 	void commit();
 	void set(T val);
@@ -85,6 +85,7 @@ public:
 	virtual ~BlockParam();
 protected:
 	T _val;
+	T *_extern_address;
 };
 
 typedef BlockParam<float> BlockParamFloat;