.

src/core/CMakeLists.txt

@@ -1,6 +1,6 @@
 add_library(dfly_core compact_object.cc dragonfly_core.cc extent_tree.cc
     external_alloc.cc interpreter.cc mi_memory_resource.cc
-    segment_allocator.cc small_string.cc tx_queue.cc dense_set.cc string_set.cc)
+    segment_allocator.cc small_string.cc tx_queue.cc dense_set.cc string_set.cc string_map.cc)
 cxx_link(dfly_core base absl::flat_hash_map absl::str_format redis_lib TRDP::lua lua_modules
     Boost::fiber crypto)
 

src/core/string_map.cc

@@ -0,0 +1,25 @@
+// Copyright 2022, DragonflyDB authors.  All rights reserved.
+// See LICENSE for licensing terms.
+//
+
+#include "core/string_map.h"
+
+using namespace std;
+
+namespace dfly {
+
+bool StringMap::AddOrSet(string_view field, string_view value, uint32_t ttl_sec) {
+
+}
+
+bool StringMap::Erase(string_view field) {
+}
+
+bool StringMap::Contains(string_view field) const {
+}
+
+void StringMap::Clear() {
+
+}
+
+}  // namespace dfly

src/core/string_map.h

@@ -0,0 +1,33 @@
+// Copyright 2022, DragonflyDB authors.  All rights reserved.
+// See LICENSE for licensing terms.
+//
+
+#pragma once
+
+#include "core/dense_set.h"
+
+extern "C" {
+#include "redis/sds.h"
+}
+
+namespace dfly {
+
+class StringMap : public DenseSet {
+ public:
+  StringMap(std::pmr::memory_resource* res = std::pmr::get_default_resource()) : DenseSet(res) {
+  }
+
+  ~StringMap() {
+    Clear();
+  }
+
+  bool AddOrSet(std::string_view field, std::string_view value, uint32_t ttl_sec = UINT32_MAX);
+
+  bool Erase(std::string_view s1);
+
+  bool Contains(std::string_view s1) const;
+
+  void Clear();
+};
+
+}  // namespace dfly

src/core/string_set.cc

@@ -158,10 +158,6 @@ std::optional<std::string> StringSet::Pop() {
   return ret;
 }
 
-sds StringSet::PopRaw() {
-  return (sds)PopInternal();
-}
-
 uint32_t StringSet::Scan(uint32_t cursor, const std::function<void(const sds)>& func) const {
   return DenseSet::Scan(cursor, [func](const void* ptr) { func((sds)ptr); });
 }

src/core/string_set.h

@@ -1,3 +1,7 @@
+// Copyright 2022, DragonflyDB authors.  All rights reserved.
+// See LICENSE for licensing terms.
+//
+
 #pragma once
 
 #include <cstdint>
@@ -26,7 +30,6 @@ class StringSet : public DenseSet {
   void Clear();
 
   std::optional<std::string> Pop();
-  sds PopRaw();
 
   ~StringSet() {
     Clear();