diff --git a/CMakeLists.txt b/CMakeLists.txt
index 54a2cc4..b4b0319 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,6 @@ xo_add_genfacet(
     INPUT idl/ResourceVisitor.json5
     OUTPUT_HPP_DIR include/xo/alloc2
     OUTPUT_IMPL_SUBDIR visitor
-    OUTPUT_CPP_DIR src/alloc2
 )
 
 # ----------------------------------------------------------------
diff --git a/idl/ResourceVisitor.json5 b/idl/ResourceVisitor.json5
index a336964..79c9d81 100644
--- a/idl/ResourceVisitor.json5
+++ b/idl/ResourceVisitor.json5
@@ -1,5 +1,6 @@
 {
     mode: "facet",
+    output_cpp_dir: "src/alloc2",
     includes: [
         "\"Allocator.hpp\""
     ],
diff --git a/include/xo/alloc2/visitor/AResourceVisitor.hpp b/include/xo/alloc2/visitor/AResourceVisitor.hpp
index 1466474..c8ab374 100644
--- a/include/xo/alloc2/visitor/AResourceVisitor.hpp
+++ b/include/xo/alloc2/visitor/AResourceVisitor.hpp
@@ -48,6 +48,8 @@ public:
     // const methods
     /** RTTI: unique id# for actual runtime data representation **/
     virtual typeseq _typeseq() const noexcept = 0;
+    /** destroy instance @p d; calls c++ dtor only for actual runtime type; does not recover memory **/
+    virtual void _drop(Opaque d) const noexcept = 0;
     /** report memory consumption **/
     virtual void on_allocator(Copaque data, obj<AAllocator> mm)  const  noexcept = 0;
 
diff --git a/include/xo/alloc2/visitor/IResourceVisitor_Any.hpp b/include/xo/alloc2/visitor/IResourceVisitor_Any.hpp
index a0d3e3c..18ae11a 100644
--- a/include/xo/alloc2/visitor/IResourceVisitor_Any.hpp
+++ b/include/xo/alloc2/visitor/IResourceVisitor_Any.hpp
@@ -54,8 +54,11 @@ namespace mm {
 
         // from AResourceVisitor
 
-        // const methods
+        // builtin methods
         typeseq _typeseq() const noexcept override { return s_typeseq; }
+        [[noreturn]] void _drop(Opaque) const noexcept override { _fatal(); }
+
+        // const methods
         [[noreturn]] void on_allocator(Copaque, obj<AAllocator>)  const  noexcept override { _fatal(); }
 
         // nonconst methods
diff --git a/include/xo/alloc2/visitor/IResourceVisitor_Xfer.hpp b/include/xo/alloc2/visitor/IResourceVisitor_Xfer.hpp
index 2ff8abd..ded806e 100644
--- a/include/xo/alloc2/visitor/IResourceVisitor_Xfer.hpp
+++ b/include/xo/alloc2/visitor/IResourceVisitor_Xfer.hpp
@@ -39,8 +39,11 @@ namespace mm {
 
         // from AResourceVisitor
 
-        // const methods
+        // builtin methods
         typeseq _typeseq() const noexcept override { return s_typeseq; }
+        void _drop(Opaque d) const noexcept override { _dcast(d).~DRepr(); }
+
+        // const methods
         void on_allocator(Copaque data, obj<AAllocator> mm)  const  noexcept override {
             return I::on_allocator(_dcast(data), mm);
         }
diff --git a/include/xo/alloc2/visitor/RResourceVisitor.hpp b/include/xo/alloc2/visitor/RResourceVisitor.hpp
index 3396e6e..6fa7a63 100644
--- a/include/xo/alloc2/visitor/RResourceVisitor.hpp
+++ b/include/xo/alloc2/visitor/RResourceVisitor.hpp
@@ -46,8 +46,13 @@ public:
     /** @defgroup mm-resourcevisitor-router-methods **/
     ///@{
 
-    // const methods
+    // explicit injected content
+
+    // builtin methods
     typeseq _typeseq() const noexcept { return O::iface()->_typeseq(); }
+    void _drop() const noexcept { O::iface()->_drop(O::data()); }
+
+    // const methods
     void on_allocator(obj<AAllocator> mm)  const  noexcept {
         return O::iface()->on_allocator(O::data(), mm);
     }