Changes in src/AST/Node.hpp [3648d98:54e41b3]

File:

• src/AST/Node.hpp (modified) (4 diffs)

src/AST/Node.hpp

@@ -9 +9 @@
 // Author           : Thierry Delisle
 // Created On       : Wed May 8 10:27:04 2019
-// Last Modified By : Aaron B. Moss
-// Last Modified On : Wed May 8 11:00:00 2019
-// Update Count     : 2
+// Last Modified By : Andrew Beach
+// Last Modified On : Wed May 15 16:02:00 2019
+// Update Count     : 3
 //
 
@@ -76 +76 @@
 // problems and be able to use auto return
 template<typename node_t>
-auto mutate(const node_t * node) {
+auto mutate( const node_t * node ) {
         assertf(
                 node->strong_count >= 1,
@@ -92 +92 @@
 }
 
-std::ostream& operator<< ( std::ostream& out, const Node* node );
+std::ostream& operator<< ( std::ostream& out, const Node * node );
 
 /// Base class for the smart pointer types
@@ -137 +137 @@
         operator const node_t * () const { return node; }
 
+        /// wrapper for convenient access to dynamic_cast
         template<typename o_node_t>
         const o_node_t * as() const { return dynamic_cast<const o_node_t *>(node); }
+
+        /// Sets this pointer to a mutated version of a pointer (possibly) owned elsehere.
+        /// Returns a mutable version of the pointer in this node.
+        node_t * set_and_mutate( const node_t * n ) {
+                // ensure ownership of `n` by this node to avoid spurious single-owner mutates
+                assign( n );
+                // get mutable version of `n`
+                auto r = mutate( node ); 
+                // re-assign mutable version in case `mutate()` produced a new pointer
+                assign( r );
+                return r;
+        }
 
         using ptr = const node_t *;