...

net/adc_endpoint.h

@@ -304,6 +304,36 @@ public:
         return proto() == protoMarkWSS;
     }
 
+    // add '\0' char (or replace special-meaning char/char-sequence) to construct UNIX abstract namespace
+    // endpoint path
+    template <typename T = std::nullptr_t>
+    AdcEndpoint& makeAbstract(const T& mark = nullptr)
+        requires(traits::adc_input_char_range<T> || std::same_as<std::remove_cv_t<T>, char> ||
+                 std::is_null_pointer_v<std::remove_cv_t<T>>)
+    {
+        if (!(isLocalStream() || isLocalSeqpacket())) {  // only local proto is valid!
+            return *this;
+        }
+
+        if constexpr (std::is_null_pointer_v<T>) {  // just insert '\0'
+            auto it = _endpoint.insert(std::string::const_iterator(_path.begin()), '\0');
+            _path = std::string_view(it, _endpoint.end());
+        } else if constexpr (std::same_as<std::remove_cv_t<T>, char>) {  // replace a character (mark)
+            auto pos = std::distance(_endpoint.cbegin(), std::string::const_iterator(_path.begin()));
+            if (_endpoint[pos] == mark) {
+                _endpoint[pos] = '\0';
+            }
+        } else {  // replace a character range (mark)
+            if (std::ranges::equal(_path | std::views::take(std::ranges::size(mark), mark))) {
+                auto pos = std::distance(_endpoint.cbegin(), std::string::const_iterator(_path.begin()));
+                _endpoint.replace(pos, std::ranges::size(mark), 1, '\0');
+                _path = std::string_view(_endpoint.begin() + pos, _endpoint.end());
+            }
+        }
+
+        return *this;
+    }
+
 protected:
     std::string _endpoint;
     std::string_view _proto, _host, _path, _portView;