diff --git a/v4/ctx.h b/v4/ctx.h
index 5cd47eb..a6f27cd 100644
--- a/v4/ctx.h
+++ b/v4/ctx.h
@@ -1,7 +1,6 @@
 #include <list>
 #include <queue>
 #include <string>
-#include "any.h"
 
 #ifndef ctx_HEADER
 #define ctx_HEADER
diff --git a/v4/ctx_test2.cpp b/v4/ctx_test2.cpp
index 58b360f..ca60a61 100644
--- a/v4/ctx_test2.cpp
+++ b/v4/ctx_test2.cpp
@@ -1,18 +1,18 @@
 #include <string>
 #include "ctx.h"
 #include "memory_Context.h"
-
 #include <iostream>
 
+std::string s(const char *str) {
+  return std::string(str);
+}
+
 std::string ctx_test_Controller_executeFunctions_set() {
   auto c = memory_createContext();
   ctx_Controller<memory_Context> ctrl(c);
   // Disable automatic invocation of executeFunctions.
   ctrl.isProcessingQueue = true;
-  std::cout << "01\n";
-  ctrl.set("input", "123");
-  std::cout << "input: '" << ctrl.context.input << "'" << std::endl;
-  std::cout << "02\n";
+  ctrl.set("input", s("123"));
 
   auto processInput = [](memory_Context c) -> memory_Context {
     if (c.recentField == "input") {
@@ -29,7 +29,14 @@ std::string ctx_test_Controller_executeFunctions_set() {
   ctrl.executeFunctions();
   // Apply 'outputHelp'.
   ctrl.executeFunctions();
-  std::cout << "input: '" << ctrl.context.input << "'" << std::endl;
+  std::cout 
+    << "input: '" 
+    << ctrl.context.input 
+    << "'" 
+    << ((ctrl.context.input == "123") ? "1" : "0")
+    << " "
+    << ((ctrl.context.outputHelp == "Checked") ? "1" : "0")
+    << std::endl;
   if (
     ctrl.context.input == "123" &&
     ctrl.context.outputHelp == "Checked"
diff --git a/v4/gen-C++ b/v4/gen-C++
index 23c8529..4502a20 100755
--- a/v4/gen-C++
+++ b/v4/gen-C++
@@ -1,4 +1,6 @@
-c++ -o test_memory_C++ -std=c++11 -I. \
+#c++ -o test_memory_C++ -std=c++11 -I. \
+#c++ -o test_memory_C++ -std=c++17 -I. \
+c++ -o test_memory_C++ -std=c++20 -I. \
   memory.cpp \
   memory_Context.cpp \
   memory_test.cpp \
diff --git a/v4/memory_Context.cpp b/v4/memory_Context.cpp
index 4b49cd9..c5b33a8 100644
--- a/v4/memory_Context.cpp
+++ b/v4/memory_Context.cpp
@@ -1,10 +1,9 @@
-#include <utility>
-#include "any.h"
+#include <any>
 #include "memory_Context.h"
 
 #include <iostream>
 
-libany::any memory_Context::field(const std::string &fieldName) {
+std::any memory_Context::field(const std::string &fieldName) {
   if (fieldName == "didLaunch") {
     return didLaunch;
   } else if (fieldName == "exit") {
@@ -42,47 +41,41 @@ libany::any memory_Context::field(const std::string &fieldName) {
   return victory;
 }
 
-void memory_Context::setField(const std::string &fieldName, libany::any value) {
+void memory_Context::setField(const std::string &fieldName, std::any value) {
   if (fieldName == "didLaunch") {
-    didLaunch = libany::any_cast<bool>(value);
+    didLaunch = std::any_cast<bool>(value);
   } else if (fieldName == "exit") {
-    exit = libany::any_cast<bool>(value);
+    exit = std::any_cast<bool>(value);
   } else if (fieldName == "hiddenItems") {
-    hiddenItems = libany::any_cast<std::vector<int> >(value);
+    hiddenItems = std::any_cast<std::vector<int> >(value);
   } else if (fieldName == "input") {
-    std::cout << "memory_Context-01\n";
-    try {
-      input = libany::any_cast<std::string>(value);
-    } catch (libany::bad_any_cast &e) {
-      std::cout << "memory_Context-01 exception/type: " << e.what() << ", " << value.type().name() << std::endl;
-    }
-    std::cout << "memory_Context-02\n";
+    input = std::any_cast<std::string>(value);
   } else if (fieldName == "mismatchedItems") {
-    mismatchedItems = libany::any_cast<std::vector<int> >(value);
+    mismatchedItems = std::any_cast<std::vector<int> >(value);
   } else if (fieldName == "outputGoOn") {
-    outputGoOn = libany::any_cast<std::string>(value);
+    outputGoOn = std::any_cast<std::string>(value);
   } else if (fieldName == "outputGreeting") {
-    outputGreeting = libany::any_cast<std::string>(value);
+    outputGreeting = std::any_cast<std::string>(value);
   } else if (fieldName == "outputHelp") {
-    outputHelp = libany::any_cast<std::string>(value);
+    outputHelp = std::any_cast<std::string>(value);
   } else if (fieldName == "outputMatchedItems") {
-    outputMatchedItems = libany::any_cast<std::string>(value);
+    outputMatchedItems = std::any_cast<std::string>(value);
   } else if (fieldName == "outputMismatchedItems") {
-    outputMismatchedItems = libany::any_cast<std::string>(value);
+    outputMismatchedItems = std::any_cast<std::string>(value);
   } else if (fieldName == "outputPromptSelection") {
-    outputPromptSelection = libany::any_cast<std::string>(value);
+    outputPromptSelection = std::any_cast<std::string>(value);
   } else if (fieldName == "outputVictory") {
-    outputVictory = libany::any_cast<std::string>(value);
+    outputVictory = std::any_cast<std::string>(value);
   } else if (fieldName == "playfieldItems") {
-    playfieldItems = libany::any_cast<std::map<int, int> >(value);
+    playfieldItems = std::any_cast<std::map<int, int> >(value);
   } else if (fieldName == "playfieldSize") {
-    playfieldSize = libany::any_cast<int>(value);
+    playfieldSize = std::any_cast<int>(value);
   } else if (fieldName == "selectedId") {
-    selectedId = libany::any_cast<int>(value);
+    selectedId = std::any_cast<int>(value);
   } else if (fieldName == "selectedItems") {
-    selectedItems = libany::any_cast<std::vector<int> >(value);
+    selectedItems = std::any_cast<std::vector<int> >(value);
   } else if (fieldName == "victory") {
-    victory = libany::any_cast<bool>(value);
+    victory = std::any_cast<bool>(value);
   }
 }
 
diff --git a/v4/memory_Context.h b/v4/memory_Context.h
index 78997fe..0a43ac8 100644
--- a/v4/memory_Context.h
+++ b/v4/memory_Context.h
@@ -1,3 +1,4 @@
+#include <any>
 #include <map>
 #include <string>
 #include <vector>
@@ -26,8 +27,8 @@ struct memory_Context {
   std::vector<int> selectedItems;
   bool victory = false;
 
-  libany::any field(const std::string &fieldName);
-  void setField(const std::string &fieldName, libany::any value);
+  std::any field(const std::string &fieldName);
+  void setField(const std::string &fieldName, std::any value);
 };
 
 memory_Context memory_createContext();