refactor: + xo-stringtable2 w/ DString impl

CMakeLists.txt

@@ -98,6 +98,7 @@ add_subdirectory(xo-callback)
 add_subdirectory(xo-printable2)   # experiment w/ facet object model
 add_subdirectory(xo-alloc)
 add_subdirectory(xo-alloc2)       # experiment w/ facet object model
+add_subdirectory(xo-stringtable2) # experiment w/ facet object model
 add_subdirectory(xo-gc)           # experiment w/ facet object model
 add_subdirectory(xo-object)
 add_subdirectory(xo-object2)      # experiment w/ facet object model

xo-alloc2/src/alloc2/CMakeLists.txt

@@ -6,6 +6,11 @@ set(SELF_SRCS
     init_alloc2.cpp
     alloc2_register_facets.cpp
 
+    CollectorTypeRegistry.cpp
+
+    ICollector_Any.cpp
+    IGCObject_Any.cpp
+
     AAllocator.cpp
     IAllocator_Any.cpp
     IAllocator_DArena.cpp

xo-alloc2/src/alloc2/CollectorTypeRegistry.cpp

@@ -7,21 +7,24 @@
 namespace xo {
     namespace mm {
         CollectorTypeRegistry &
-        CollectorTypeRegistry::instance() {
+        CollectorTypeRegistry::instance()
+        {
             static CollectorTypeRegistry s_instance;
 
             return s_instance;
         }
 
         void
-        CollectorTypeRegistry::register_types(init_function_type fn) {
+        CollectorTypeRegistry::register_types(init_function_type fn)
+        {
             scope log(XO_DEBUG(true));
 
             init_seq_v_.push_back(fn);
         }
 
         bool
-        CollectorTypeRegistry::install_types(obj<ACollector> gc) {
+        CollectorTypeRegistry::install_types(obj<ACollector> gc)
+        {
             scope log(XO_DEBUG(true));
 
             bool ok = true;

xo-expression2/include/xo/expression2/DUniqueString.hpp

@@ -5,7 +5,7 @@
 
 #pragma once
 
-#include <xo/object2/DString.hpp>
+#include <xo/stringtable2/DString.hpp>
 
 namespace xo {
     namespace scm {

xo-expression2/src/expression2/init_expression2.cpp

@@ -8,7 +8,7 @@
 #include "expression2_register_types.hpp"
 
 #include <xo/procedure2/init_procedure2.hpp>
-#include <xo/gc/CollectorTypeRegistry.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
 
 namespace xo {
     using xo::scm::expression2_register_facets;

xo-expression2/utest/DApplyExpr.test.cpp

@@ -20,10 +20,10 @@
 #include <xo/object2/DFloat.hpp>
 #include <xo/object2/number/IGCObject_DFloat.hpp>
 
-#include <xo/gc/CollectorTypeRegistry.hpp>
-#include <xo/gc/DX1Collector.hpp>
-#include <xo/gc/detail/IAllocator_DX1Collector.hpp>
-#include <xo/gc/detail/ICollector_DX1Collector.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
+#include <xo/gc/X1Collector.hpp>
+//#include <xo/gc/detail/IAllocator_DX1Collector.hpp>
+//#include <xo/gc/detail/ICollector_DX1Collector.hpp>
 
 #include <xo/printable2/Printable.hpp>
 #include <xo/facet/FacetRegistry.hpp>

xo-expression2/utest/DConstant.test.cpp

@@ -13,10 +13,8 @@
 #include <xo/object2/number/IGCObject_DFloat.hpp>
 #include <xo/object2/number/IGCObject_DInteger.hpp>
 
-#include <xo/gc/CollectorTypeRegistry.hpp>
-#include <xo/gc/DX1Collector.hpp>
-#include <xo/gc/detail/IAllocator_DX1Collector.hpp>
-#include <xo/gc/detail/ICollector_DX1Collector.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
+#include <xo/gc/X1Collector.hpp>
 
 #include <xo/printable2/Printable.hpp>
 #include <xo/facet/FacetRegistry.hpp>

xo-expression2/utest/DDefineExpr.test.cpp

@@ -14,10 +14,10 @@
 #include <xo/object2/DFloat.hpp>
 #include <xo/object2/number/IGCObject_DFloat.hpp>
 
-#include <xo/gc/CollectorTypeRegistry.hpp>
-#include <xo/gc/DX1Collector.hpp>
-#include <xo/gc/detail/IAllocator_DX1Collector.hpp>
-#include <xo/gc/detail/ICollector_DX1Collector.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
+#include <xo/gc/X1Collector.hpp>
+//#include <xo/gc/detail/IAllocator_DX1Collector.hpp>
+//#include <xo/gc/detail/ICollector_DX1Collector.hpp>
 
 #include <xo/printable2/Printable.hpp>
 #include <xo/facet/FacetRegistry.hpp>

xo-expression2/utest/DIfElseExpr.test.cpp

@@ -15,10 +15,10 @@
 #include <xo/object2/number/IGCObject_DFloat.hpp>
 #include <xo/object2/boolean/IGCObject_DBoolean.hpp>
 
-#include <xo/gc/CollectorTypeRegistry.hpp>
-#include <xo/gc/DX1Collector.hpp>
-#include <xo/gc/detail/IAllocator_DX1Collector.hpp>
-#include <xo/gc/detail/ICollector_DX1Collector.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
+#include <xo/gc/X1Collector.hpp>
+//#include <xo/gc/detail/IAllocator_DX1Collector.hpp>
+//#include <xo/gc/detail/ICollector_DX1Collector.hpp>
 
 #include <xo/printable2/Printable.hpp>
 #include <xo/facet/FacetRegistry.hpp>

xo-expression2/utest/DVariable.test.cpp

@@ -9,10 +9,8 @@
 #include <xo/expression2/detail/IPrintable_DVariable.hpp>
 #include <xo/expression2/StringTable.hpp>
 
-#include <xo/gc/CollectorTypeRegistry.hpp>
-#include <xo/gc/DX1Collector.hpp>
-#include <xo/gc/detail/IAllocator_DX1Collector.hpp>
-#include <xo/gc/detail/ICollector_DX1Collector.hpp>
+#include <xo/gc/X1Collector.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
 
 #include <xo/printable2/Printable.hpp>
 #include <xo/facet/FacetRegistry.hpp>

xo-expression2/utest/X1Collector.test.cpp

@@ -12,14 +12,10 @@
 #include <xo/object2/DFloat.hpp>
 #include <xo/object2/DInteger.hpp>
 #include <xo/object2/DList.hpp>
-#include <xo/object2/DString.hpp>
-
-#include <xo/gc/CollectorTypeRegistry.hpp>
-#include <xo/gc/DX1Collector.hpp>
-
-#include <xo/gc/detail/IAllocator_DX1Collector.hpp>
-#include <xo/gc/detail/ICollector_DX1Collector.hpp>
+#include <xo/stringtable2/DString.hpp>
 
+#include <xo/gc/X1Collector.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
 #include <xo/subsys/Subsystem.hpp>
 
 #include <catch2/catch.hpp>

xo-gc/src/gc/CMakeLists.txt

@@ -3,11 +3,6 @@
 set(SELF_LIB xo_gc)
 set(SELF_SRCS
 
-    CollectorTypeRegistry.cpp
-
-    ICollector_Any.cpp
-    IGCObject_Any.cpp
-
     IAllocator_DX1Collector.cpp
     ICollector_DX1Collector.cpp
     IAllocIterator_DX1CollectorIterator.cpp

xo-interpreter2/src/interpreter2/init_interpreter2.cpp

@@ -9,7 +9,7 @@
 #include "interpreter2_register_types.hpp"
 
 #include <xo/reader2/init_reader2.hpp>
-#include <xo/gc/CollectorTypeRegistry.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
 
 namespace xo {
     using xo::scm::interpreter2_register_facets;

xo-object2/cmake/xo_object2Config.cmake.in

@@ -3,6 +3,7 @@
 include(CMakeFindDependencyMacro)
 find_dependency(reflect)
 find_dependency(xo_gc)
+find_dependency(xo_stringtable2)
 find_dependency(xo_printable2)
 find_dependency(subsys)
 find_dependency(indentlog)

xo-object2/include/xo/object2/object2_register_facets.hpp

@@ -5,8 +5,6 @@
 
 #pragma once
 
-#include <xo/alloc2/Collector.hpp>
-
 namespace xo {
     namespace scm {
         /** Register object2 (facet,impl) combinations with FacetRegistry **/

xo-object2/src/object2/CMakeLists.txt

@@ -33,10 +33,6 @@ set(SELF_SRCS
     IGCObject_DBoolean.cpp
     IPrintable_DBoolean.cpp
 
-    DString.cpp
-    IGCObject_DString.cpp
-    IPrintable_DString.cpp
-
     DDictionary.cpp
     IGCObject_DDictionary.cpp
     IPrintable_DDictionary.cpp
@@ -50,6 +46,7 @@ xo_add_shared_library4(${SELF_LIB} ${PROJECT_NAME}Targets ${PROJECT_VERSION} 1 $
 # note: deps here must also appear in cmake/xo_object2Config.cmake.in
 xo_dependency(${SELF_LIB} reflect)
 xo_dependency(${SELF_LIB} xo_gc)
+xo_dependency(${SELF_LIB} xo_stringtable2)
 xo_dependency(${SELF_LIB} xo_printable2)
 xo_dependency(${SELF_LIB} subsys)
 xo_dependency(${SELF_LIB} indentlog)

xo-object2/src/object2/init_object2.cpp

@@ -6,7 +6,8 @@
 #include "init_object2.hpp"
 #include "object2_register_facets.hpp"
 #include "object2_register_types.hpp"
-#include <xo/gc/CollectorTypeRegistry.hpp>
+#include <xo/stringtable2/init_stringtable2.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
 #include <xo/alloc2/init_alloc2.hpp>
 
 namespace xo {
@@ -29,6 +30,7 @@ namespace xo {
 
             /* direct subsystem deps for xo-object2/ */
             retval ^= InitSubsys<S_alloc2_tag>::require();
+            retval ^= InitSubsys<S_stringtable2_tag>::require();
 
             /* xo-expression2/'s own initialization code */
             retval ^= Subsystem::provide<S_object2_tag>("object2", &init);

xo-object2/src/object2/object2_register_facets.cpp

@@ -12,7 +12,7 @@
 #include <xo/object2/Boolean.hpp>
 #include <xo/object2/Integer.hpp>
 #include <xo/object2/Float.hpp>
-#include <xo/object2/String.hpp>
+#include <xo/stringtable2/String.hpp>
 
 #include <xo/printable2/detail/APrintable.hpp>
 #include <xo/alloc2/alloc/AAllocator.hpp>
@@ -70,7 +70,6 @@ namespace xo {
             log && log(xtag("DBoolean.tseq", typeseq::id<DBoolean>()));
             log && log(xtag("DFloat.tseq", typeseq::id<DFloat>()));
             log && log(xtag("DInteger.tseq", typeseq::id<DInteger>()));
-            log && log(xtag("DString.tseq", typeseq::id<DString>()));
             log && log(xtag("DArray.tseq", typeseq::id<DArray>()));
             log && log(xtag("DDictionary.tseq", typeseq::id<DDictionary>()));
             log && log(xtag("DRuntimeError.tseq", typeseq::id<DRuntimeError>()));

xo-object2/src/object2/object2_register_types.cpp

@@ -36,8 +36,6 @@ namespace xo {
 
             ok &= gc.install_type(impl_for<AGCObject, DInteger>());
 
-            ok &= gc.install_type(impl_for<AGCObject, DString>());
-
             ok &= gc.install_type(impl_for<AGCObject, DList>());
 
             ok &= gc.install_type(impl_for<AGCObject, DArray>());

xo-object2/utest/CMakeLists.txt

@@ -4,8 +4,8 @@ set(UTEST_EXE utest.object2)
 set(UTEST_SRCS
     object2_utest_main.cpp
     DArray.test.cpp
-    DString.test.cpp
-    StringOps.test.cpp
+#    DString.test.cpp
+#    StringOps.test.cpp
     X1Collector.test.cpp
     Printable.test.cpp
 )

xo-object2/utest/Printable.test.cpp

@@ -12,9 +12,9 @@
 #include <xo/object2/list/IGCObject_DList.hpp>
 #include <xo/object2/list/IPrintable_DList.hpp>
 
-#include <xo/object2/DString.hpp>
-#include <xo/object2/string/IGCObject_DString.hpp>
-#include <xo/object2/string/IPrintable_DString.hpp>
+#include <xo/stringtable2/String.hpp>
+//#include <xo/object2/string/IGCObject_DString.hpp>
+//#include <xo/object2/string/IPrintable_DString.hpp>
 
 #include <xo/object2/DInteger.hpp>
 #include <xo/object2/number/IGCObject_DInteger.hpp>

xo-object2/utest/X1Collector.test.cpp

@@ -15,7 +15,7 @@
 #include "number/IGCObject_DInteger.hpp"
 #include "list/IGCObject_DList.hpp"
 
-#include <xo/gc/CollectorTypeRegistry.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
 #include <xo/alloc2/Collector.hpp>
 #include <xo/gc/DX1Collector.hpp>
 

xo-procedure2/include/xo/procedure2/DPrimitive_gco_3_dict_string_gco.hpp

@@ -6,7 +6,7 @@
 #pragma once
 
 #include <xo/object2/Dictionary.hpp>
-#include <xo/object2/String.hpp>
+#include <xo/stringtable2/String.hpp>
 #include <xo/alloc2/GCObject.hpp>
 #include "DPrimitive.hpp"
 

xo-procedure2/src/procedure2/init_procedure2.cpp

@@ -9,7 +9,7 @@
 #include "procedure2_register_types.hpp"
 
 #include <xo/object2/init_object2.hpp>
-#include <xo/gc/CollectorTypeRegistry.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
 
 namespace xo {
     using xo::scm::procedure2_register_facets;

xo-reader2/include/xo/reader2/ParserResult.hpp

@@ -6,7 +6,7 @@
 #pragma once
 
 #include <xo/expression2/Expression.hpp>
-#include <xo/object2/DString.hpp>
+#include <xo/stringtable2/DString.hpp>
 #include <xo/indentlog/print/pretty.hpp>
 #include <string_view>
 

xo-reader2/src/reader2/DExpectExprSsm.cpp

@@ -18,15 +18,13 @@
 #include <xo/object2/Boolean.hpp>
 #include <xo/object2/Integer.hpp>
 #include <xo/object2/Float.hpp>
-#include <xo/object2/String.hpp>
+#include <xo/stringtable2/String.hpp>
 #include <xo/alloc2/GCObject.hpp>
 #include <xo/facet/facet_implementation.hpp>
 
 #ifdef NOT_YET
 #include "define_xs.hpp"
 #include "paren_xs.hpp"
-#include "sequence_xs.hpp"
-#include "progress_xs.hpp"
 #endif
 
 namespace xo {

xo-reader2/src/reader2/DToplevelSeqSsm.cpp

@@ -17,17 +17,17 @@
 #include <xo/expression2/Constant.hpp>
 //#include <xo/expression2/detail/IExpression_DConstant.hpp>
 
-#include <xo/object2/DString.hpp>
-#include <xo/object2/string/IGCObject_DString.hpp>
+#include <xo/stringtable2/String.hpp>
+//#include <xo/object2/string/IGCObject_DString.hpp>
 
-#include <xo/object2/DFloat.hpp>
-#include <xo/object2/number/IGCObject_DFloat.hpp>
+#include <xo/object2/Float.hpp>
+//#include <xo/object2/number/IGCObject_DFloat.hpp>
 
-#include <xo/object2/DInteger.hpp>
-#include <xo/object2/number/IGCObject_DInteger.hpp>
+#include <xo/object2/Integer.hpp>
+//#include <xo/object2/number/IGCObject_DInteger.hpp>
 
-#include <xo/object2/DBoolean.hpp>
-#include <xo/object2/boolean/IGCObject_DBoolean.hpp>
+#include <xo/object2/Boolean.hpp>
+//#include <xo/object2/boolean/IGCObject_DBoolean.hpp>
 
 #include <xo/alloc2/GCObject.hpp>
 

xo-reader2/src/reader2/init_reader2.cpp

@@ -9,7 +9,7 @@
 
 #include <xo/expression2/init_expression2.hpp>
 #include <xo/numeric/init_numeric.hpp>
-#include <xo/gc/CollectorTypeRegistry.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
 
 namespace xo {
     using xo::scm::reader2_register_facets;

xo-reader2/utest/SchematikaParser.test.cpp

@@ -17,7 +17,7 @@
 #include <xo/procedure2/Primitive_gco_2_gco_gco.hpp>
 #include <xo/object2/Float.hpp>
 #include <xo/object2/Integer.hpp>
-#include <xo/object2/String.hpp>
+#include <xo/stringtable2/String.hpp>
 #include <xo/alloc2/arena/IAllocator_DArena.hpp>
 #include <xo/facet/TypeRegistry.hpp>
 #include <catch2/catch.hpp>
@@ -25,10 +25,10 @@
 namespace xo {
     using xo::scm::ParserConfig;
     using xo::scm::SchematikaParser;
-    using xo::scm::ASyntaxStateMachine;
-    using xo::scm::syntaxstatetype;
+//    using xo::scm::ASyntaxStateMachine;
+//    using xo::scm::syntaxstatetype;
 //    using xo::scm::DDefineSsm;
-    using xo::scm::DExpectExprSsm;
+//    using xo::scm::DExpectExprSsm;
 
     using xo::scm::AExpression;
     using xo::scm::DDefineExpr;
@@ -51,7 +51,7 @@ namespace xo {
     using xo::mm::AAllocator;
     using xo::mm::DArena;
     using xo::mm::MemorySizeInfo;
-    using xo::facet::with_facet;
+//    using xo::facet::with_facet;
 
     static InitEvidence s_init = (InitSubsys<S_reader2_tag>::require());
 

xo-stringtable2/CMakeLists.txt

@@ -0,0 +1,31 @@
+# xo-stringtable2/CMakeLists.txt
+
+cmake_minimum_required(VERSION 3.10)
+
+project(xo_stringtable2 VERSION 1.0)
+enable_language(CXX)
+
+include(GNUInstallDirs)
+include(cmake/xo-bootstrap-macros.cmake)
+
+xo_cxx_toplevel_options3()
+
+# ----------------------------------------------------------------
+# c++ settings
+
+# one-time project-specific c++ flags. usually empty
+set(PROJECT_CXX_FLAGS "")
+add_definitions(${PROJECT_CXX_FLAGS})
+
+# ----------------------------------------------------------------
+# output targets
+
+add_subdirectory(src/stringtable2)
+add_subdirectory(utest)
+
+# ----------------------------------------------------------------
+# cmake export
+
+xo_export_cmake_config(${PROJECT_NAME} ${PROJECT_VERSION} ${PROJECT_NAME}Targets)
+
+# end CMakeLists.txt

xo-stringtable2/cmake/xo-bootstrap-macros.cmake

@@ -0,0 +1,41 @@
+# ----------------------------------------------------------------
+# for example:
+#   $ PREFIX=/usr/local   # for example
+#   $ cmake -DCMAKE_MODULE_PATH=prefix -DCMAKE_INSTALL_PREFIX=$PREFIX -B .build
+#
+# will get
+#   CMAKE_MODULE_PATH
+# from xo-cmake-config --cmake-module-path
+#
+# and expect .cmake macros in
+#   CMAKE_MODULE_PATH/xo_macros/xo_cxx.cmake
+# ----------------------------------------------------------------
+
+find_program(XO_CMAKE_CONFIG_EXECUTABLE NAMES xo-cmake-config REQUIRED)
+
+if ("${XO_CMAKE_CONFIG_EXECUTABLE}" STREQUAL "XO_CMAKE_CONFIG_EXECUTABLE-NOT_FOUND")
+    message(FATAL "could not find xo-cmake-config executable")
+endif()
+
+message(STATUS "XO_CMAKE_CONFIG_EXECUTABLE=${XO_CMAKE_CONFIG_EXECUTABLE}")
+
+if (XO_SUBMODULE_BUILD)
+    if (("${CMAKE_MODULE_PATH}" STREQUAL "") OR ("${CMAKE_MODULE_PATH}" STREQUAL prefix))
+        # local version of xo-cmake macros
+        set(CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/xo-cmake/cmake")
+        message(STATUS "CMAKE_MODULE_PATH=${CMAKE_MODULE_PATH}")
+    endif()
+else()
+    if (("${CMAKE_MODULE_PATH}" STREQUAL "") OR ("${CMAKE_MODULE_PATH}" STREQUAL prefix))
+        # default to typical install location for xo-project-macros
+        execute_process(COMMAND ${XO_CMAKE_CONFIG_EXECUTABLE} --cmake-module-path OUTPUT_VARIABLE CMAKE_MODULE_PATH)
+        message(STATUS "CMAKE_MODULE_PATH=${CMAKE_MODULE_PATH}")
+    endif()
+endif()
+
+# needs to have been installed somewhere on CMAKE_MODULE_PATH,
+# (e.g. from xo-cmake with the same value for CMAKE_INSTALL_PREFIX)
+#
+include(xo_macros/xo_cxx)
+
+xo_cxx_bootstrap_message()

xo-stringtable2/cmake/xo_stringtable2Config.cmake.in

@@ -0,0 +1,16 @@
+@PACKAGE_INIT@
+
+include(CMakeFindDependencyMacro)
+
+# note: changes to find_dependency() calls here
+#       must coordinate with xo_dependency() calls
+#       in CMakeLists.txt
+#
+find_dependency(xo_alloc2)
+find_dependency(xo_printable2)
+find_dependency(subsys)
+find_dependency(indentlog)
+
+include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")
+include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Share.cmake")
+check_required_components("@PROJECT_NAME@")

xo-stringtable2/include/xo/stringtable2/init_stringtable2.hpp

@@ -0,0 +1,21 @@
+/** @file init_stringtable2.hpp
+ *
+ *  @author Roland Conybeare, Jan 2026
+ **/
+
+#pragma once
+
+#include <xo/subsys/Subsystem.hpp>
+
+namespace xo {
+    /* tag to represent the xo-expression2/ subsystem within ordered initialization */
+    enum S_stringtable2_tag {};
+
+    template <>
+    struct InitSubsys<S_stringtable2_tag> {
+        static void init();
+        static InitEvidence require();
+    };
+} /*namespace xo*/
+
+/* end init_stringtable2.hpp */

xo-stringtable2/include/xo/stringtable2/stringtable2_register_facets.hpp

@@ -0,0 +1,15 @@
+/** @file stringtable2_register_facets.hpp
+ *
+ *  @author Roland Conybeare, Mar 2026
+ **/
+
+#pragma once
+
+namespace xo {
+    namespace scm {
+        /** Register object2 (facet,impl) combinations with FacetRegistry **/
+        bool stringtable2_register_facets();
+    }
+}
+
+/* end stringtable2_register_facets.hpp */

xo-stringtable2/include/xo/stringtable2/stringtable2_register_types.hpp

@@ -0,0 +1,17 @@
+/** @file stringtable2_register_types.hpp
+ *
+ *  @author Roland Conybeare, Dec 2025
+ **/
+
+#pragma once
+
+#include <xo/alloc2/Collector.hpp>
+
+namespace xo {
+    namespace scm {
+        /** Register stringtable2 (facet,impl) combinations with FacetRegistry **/
+        bool stringtable2_register_types(obj<xo::mm::ACollector> gc);
+    }
+}
+
+/* end stringtable2_register_types.hpp */

xo-stringtable2/src/stringtable2/CMakeLists.txt

@@ -0,0 +1,28 @@
+# xo-stringtable2/src/stringtable2/CMakeLists.txt
+
+set(SELF_LIB xo_stringtable2)
+set(SELF_SRCS
+    init_stringtable2.cpp
+    stringtable2_register_facets.cpp
+    stringtable2_register_types.cpp
+
+    DString.cpp
+    IGCObject_DString.cpp
+    IPrintable_DString.cpp
+)
+
+xo_add_shared_library4(${SELF_LIB} ${PROJECT_NAME}Targets ${PROJECT_VERSION} 1 ${SELF_SRCS})
+xo_install_include_tree3(include/xo/stringtable2)
+
+# ----------------------------------------------------------------
+# input dependencies
+#
+# NOTE: dependency set here must be kept consistent with
+#       xo-stringtable2/cmake/xo_stringtable2Config.cmake.in
+
+xo_dependency(${SELF_LIB} xo_alloc2)
+xo_dependency(${SELF_LIB} xo_printable2)
+xo_dependency(${SELF_LIB} subsys)
+xo_dependency(${SELF_LIB} indentlog)
+
+# end src/stringtable2/CMakeLists.txt

xo-stringtable2/src/stringtable2/init_stringtable2.cpp

@@ -0,0 +1,43 @@
+/** @file init_stringtable2.cpp
+ *
+ *  @author Roland Conybeare, Jan 2026
+ **/
+
+#include "init_stringtable2.hpp"
+#include "stringtable2_register_facets.hpp"
+#include "stringtable2_register_types.hpp"
+#include <xo/stringtable2/init_stringtable2.hpp>
+//n#include <xo/printable2/init_printable2.hpp>
+#include <xo/alloc2/CollectorTypeRegistry.hpp>
+#include <xo/alloc2/init_alloc2.hpp>
+
+namespace xo {
+    using xo::scm::stringtable2_register_facets;
+    using xo::scm::stringtable2_register_types;
+    using xo::mm::CollectorTypeRegistry;
+
+    void
+    InitSubsys<S_stringtable2_tag>::init()
+        {
+            stringtable2_register_facets();
+
+            CollectorTypeRegistry::instance().register_types(&stringtable2_register_types);
+        }
+
+    InitEvidence
+    InitSubsys<S_stringtable2_tag>::require()
+        {
+            InitEvidence retval;
+
+            /* direct subsystem deps for xo-stringtable2/ */
+            retval ^= InitSubsys<S_alloc2_tag>::require();
+            //retval ^= InitSubsys<S_printable_tag>::require();
+
+            /* xo-expression2/'s own initialization code */
+            retval ^= Subsystem::provide<S_stringtable2_tag>("stringtable2", &init);
+
+            return retval;
+        }
+} /*namespace xo*/
+
+/* end init_stringtable2.cpp */

xo-stringtable2/src/stringtable2/stringtable2_register_facets.cpp

@@ -0,0 +1,36 @@
+/** @file stringtable2_register_facets.cpp
+ *
+ *  @author Roland Conybeare, Mar 2026
+ **/
+
+#include "stringtable2_register_facets.hpp"
+
+#include <xo/stringtable2/String.hpp>
+
+#include <xo/facet/FacetRegistry.hpp>
+#include <xo/indentlog/scope.hpp>
+
+namespace xo {
+    using xo::print::APrintable;
+    using xo::mm::AGCObject;
+    using xo::scm::DString;
+    using xo::facet::FacetRegistry;
+    using xo::facet::typeseq;
+
+    namespace scm {
+        bool
+        stringtable2_register_facets()
+        {
+            scope log(XO_DEBUG(true));
+
+            FacetRegistry::register_impl<AGCObject, DString>();
+            FacetRegistry::register_impl<APrintable, DString>();
+
+            log && log(xtag("DString.tseq", typeseq::id<DString>()));
+
+            return true;
+        }
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end stringtable2_register_facets.cpp */

xo-stringtable2/src/stringtable2/stringtable2_register_types.cpp

@@ -0,0 +1,33 @@
+/** @file stringtable2_register_types.cpp
+ *
+ *  @author Roland Conybeare, Mar 2026
+ **/
+
+#include "stringtable2_register_types.hpp"
+#include "String.hpp"
+
+//#include <xo/facet/FacetRegistry.hpp>
+#include <xo/indentlog/scope.hpp>
+
+namespace xo {
+    using xo::mm::ACollector;
+    using xo::mm::AGCObject;
+    using xo::facet::impl_for;
+    using xo::scope;
+
+    namespace scm {
+        bool
+        stringtable2_register_types(obj<ACollector> gc)
+        {
+            scope log(XO_DEBUG(true));
+
+            bool ok = true;
+
+            ok &= gc.install_type(impl_for<AGCObject, DString>());
+
+            return ok;
+        }
+    }
+} /*namespace xo*/
+
+/* end stringtable2_register_types.cpp */

xo-stringtable2/utest/CMakeLists.txt

@@ -0,0 +1,13 @@
+# built unittest xo-object2/utest
+
+set(UTEST_EXE utest.stringtable2)
+set(UTEST_SRCS
+    stringtable2_utest_main.cpp
+    DString.test.cpp
+    StringOps.test.cpp
+)
+
+xo_add_utest_executable(${UTEST_EXE} ${UTEST_SRCS})
+xo_self_dependency(${UTEST_EXE} xo_stringtable2)
+#xo_dependency(${UTEST_EXE} randomgen)
+xo_external_target_dependency(${UTEST_EXE} Catch2 Catch2::Catch2)

xo-stringtable2/utest/DString.test.cpp

@@ -3,7 +3,7 @@
  *  @author Roland Conybeare, Jan 2026
  **/
 
-#include "init_object2.hpp"
+#include "init_stringtable2.hpp"
 #include "StringOps.hpp"
 #include <xo/alloc2/Allocator.hpp>
 #include <xo/alloc2/arena/IAllocator_DArena.hpp>
@@ -21,7 +21,8 @@ namespace xo {
     using xo::facet::obj;
 
     namespace ut {
-        static InitEvidence s_init = (InitSubsys<S_object2_tag>::require());
+
+        static InitEvidence s_init = (InitSubsys<S_stringtable2_tag>::require());
 
         TEST_CASE("DString-init", "[object2][DString]")
         {

xo-stringtable2/utest/StringOps.test.cpp

@@ -3,7 +3,7 @@
  *  @author Roland Conybeare, Jan 2026
  **/
 
-#include <xo/object2/StringOps.hpp>
+#include <xo/stringtable2/StringOps.hpp>
 #include <xo/alloc2/arena/IAllocator_DArena.hpp>
 #include <catch2/catch.hpp>
 #include <cstring>
@@ -19,6 +19,7 @@ namespace xo {
     using xo::facet::obj;
 
     namespace ut {
+
         TEST_CASE("StringOps-empty", "[object2][StringOps]")
         {
             ArenaConfig cfg { .name_ = "testarena",

xo-stringtable2/utest/stringtable2_utest_main.cpp

@@ -0,0 +1,24 @@
+/* file stringtable2_utest_main.cpp */
+
+#include <xo/subsys/Subsystem.hpp>
+
+#define CATCH_CONFIG_RUNNER
+#include "catch2/catch.hpp"
+
+int
+main(int argc, char* argv[])
+{
+    using xo::Subsystem;
+
+    // Your custom initialization code here
+    Subsystem::initialize_all();
+
+    // Run Catch2's test session
+    int result = Catch::Session().run(argc, argv);
+
+    // cleanup here, if any
+
+    return result;
+}
+
+/* end stringtable2_utest_main.cpp */