1 files changed, 30 insertions, 0 deletions
diff --git a/src/util/any_map.cpp b/src/util/any_map.cpp
new file mode 100644
index 00000000..c49464d3
--- /dev/null
+++ b/src/util/any_map.cpp
@@ -0,0 +1,30 @@
+#include "any_map.hpp"
+
+namespace cru::util {
+AnyMap::ListenerToken AnyMap::RegisterValueChangeListener(
+    const String& key, const Listener& listener) {
+  const auto token = current_listener_token_++;
+  map_[key].second.push_back(token);
+  listeners_.emplace(token, listener);
+  return token;
+}
+
+void AnyMap::UnregisterValueChangeListener(const ListenerToken token) {
+  const auto find_result = listeners_.find(token);
+  if (find_result != listeners_.cend()) listeners_.erase(find_result);
+}
+
+void AnyMap::InvokeListeners(std::list<ListenerToken>& listener_list,
+                             const std::any& value) {
+  auto i = listener_list.cbegin();
+  while (i != listener_list.cend()) {
+    auto current_i = i++;
+    const auto find_result = listeners_.find(*current_i);
+    if (find_result != listeners_.cend())
+      find_result->second(value);
+    else
+      listener_list.erase(
+          current_i);  // otherwise remove the invalid listener token.
+  }
+}
+}  // namespace cru::util