X-Git-Url: https://bilbo.iut-bm.univ-fcomte.fr/and/gitweb/loba.git/blobdiff_plain/c4e7c13743a9d1e8dfa5dc27d4b2fa3aaf1557ab..HEAD:/named_object_list.h

diff --git a/named_object_list.h b/named_object_list.h
index 03bf00d..7731a89 100644
--- a/named_object_list.h
+++ b/named_object_list.h
@@ -4,6 +4,17 @@
 #include <map>
 #include <string>
 
+// Define an associative container that maps a name with a class and a
+// description.  All classes must be derived from a same base class.
+//
+// We can then use the name to create an object of the associated
+// class, and to retrieve a pointer to this object.
+//
+// Furthermore, it is possible to iterate over the elements to get
+// their name and their description.
+
+// I am too lazy to comment the code, which should be obvious...
+
 //===== arity 0 =====
 
 template <typename Base>
@@ -13,6 +24,7 @@ protected:
         std::string description;
         creator_base(const std::string& descr): description(descr) { }
         creator_base(const char* descr): description(descr) { }
+        virtual ~creator_base() { }
         virtual Base* operator()() const = 0;
     };
 
@@ -53,19 +65,15 @@ public:
         if (it != assoc.end())
             return (*it->second)();
         else
-            return NULL;
-    }
-
-    Base* new_instance(const char* name) const
-    {
-        return new_instance(std::string(name));
+            return nullptr;
     }
 
     const std::string& get_name(iterator& it) const { return it->first; }
     const std::string& get_descr(iterator& it) const
     { return it->second->description; }
 
-    size_t size() const          { return assoc.size();  }
+    bool exists(const std::string& name) const
+    { return assoc.find(name) != assoc.end(); }
     iterator begin() const       { return assoc.begin(); }
     iterator end() const         { return assoc.end();   }
 
@@ -73,9 +81,6 @@ public:
 
 //===== arity 2 =====
 
-#include <map>
-#include <string>
-
 template <typename Base, typename Arg1, typename Arg2>
 class named_object_list2 {
 protected:
@@ -83,6 +88,7 @@ protected:
         std::string description;
         creator_base(const std::string& descr): description(descr) { }
         creator_base(const char* descr): description(descr) { }
+        virtual ~creator_base() { }
         virtual Base* operator()(Arg1, Arg2) const = 0;
     };
 
@@ -124,12 +130,7 @@ public:
         if (it != assoc.end())
             return (*it->second)(arg1, arg2);
         else
-            return NULL;
-    }
-
-    Base* new_instance(const char* name, Arg1 arg1, Arg2 arg2) const
-    {
-        return new_instance(std::string(name), arg1, arg2);
+            return nullptr;
     }
 
     const std::string& get_name(iterator& it) const { return it->first; }
@@ -145,6 +146,7 @@ public:
 
 //===================
 
+// "NOL" like in Named_Object_List....
 #define NOL_INSERT(name, descr, class) insert(name, new creator<class>(descr))
 
 #endif // !NAMED_OBJECT_LIST_H