Merge pull request #81 from AjayBrahmakshatriya/master

Blocks AST cloning

include/blocks/block.h

@@ -29,6 +29,20 @@ std::shared_ptr<T> to(std::shared_ptr<block> p) {
 	return ret;
 }
 
+template <typename T>
+std::shared_ptr<T> clone(std::shared_ptr<T> p) {
+	if (!p) return nullptr;
+	return to<T>(p->clone_impl());
+}
+
+template <typename T>
+std::shared_ptr<T> clone_obj(T* t) {
+	auto np = std::make_shared<T>();
+	np->static_offset = t->static_offset;
+	np->metadata_map = t->metadata_map;
+	return np;
+}
+
 template <typename T>
 class block_metadata_impl;
 
@@ -62,6 +76,8 @@ class block_metadata_impl : public block_metadata {
 	block_metadata_impl(T _val) : val(_val) {}
 };
 
+
+
 class block : public std::enable_shared_from_this<block> {
 public:
 	virtual ~block() = default;
@@ -113,6 +129,11 @@ class block : public std::enable_shared_from_this<block> {
 			return false;
 		return true;
 	}
+
+	virtual block::Ptr clone_impl(void) {
+		// abstract class always returns nullptr
+		return nullptr;
+	}
 };
 } // namespace block
 #endif