count function

dlang · May 25, 2024 · b9cef4a · b9cef4a
1 parent 7034a0f
commit b9cef4a
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Showing 3 changed files with 12 additions and 1 deletion.
diff --git a/extras/AssociativeContainers/map.hpp b/extras/AssociativeContainers/map.hpp
@@ -33,4 +33,7 @@ class Map
     size_t max_size() const         { return this->map.max_size(); }
 
     void clear() noexcept           { this->map.clear(); }
+
+    size_t count(K const& key ) const { return this->map.count(key); }
+
 };
diff --git a/source/stdcpp/map.d b/source/stdcpp/map.d
@@ -33,7 +33,7 @@ module stdcpp.map;
 
     ref Value at( ref const Key key);
 
-    ref Value at(const Key key)
+    extern(D) ref Value at(const Key key)
     {
         return this.at(key);
     }
@@ -43,4 +43,11 @@ module stdcpp.map;
     size_t max_size() const;
 
     void clear() nothrow;
+
+    size_t count(ref const Key key) const;
+
+    extern(D) size_t count(const Key key)
+    {
+        return this.count(key);
+    }
  }
diff --git a/source/stdcpp/test/map.d b/source/stdcpp/test/map.d
@@ -22,4 +22,5 @@ unittest
     mymap.clear();
     assert(mymap.size == 0);
     assert(mymap.empty == 1);
+    assert(mymap.count(1) == 1); // key 1 exists once
 }