improved list support

DOCUMENTATION.md

@@ -2,13 +2,13 @@
 
 ```
 /*
- * Hint:
- * There are no attributes without a group. You cand find them in the [default] group.
- * But you dont need to care about this, just handle them like they dont have a group.
- * The lib does the job there!
- */
+* Hint:
+* There are no attributes without a group. You cant find them in the [default] group.
+* But you don't need to care about this, just handle them like they don't have a group.
+* The lib does the job there!
+*/
 
-    // Constructor
+// Constructor
 // Opens the file 'file' or creates it, if it does not exists.
 config_file(const std::string& file);
 
@@ -57,12 +57,14 @@ bool write(const std::string& name, const std::string& value, const std::string&
 // Writes the attribute 'name' in the group 'group' and assigns the list 'value'.
 // Creates a new group if 'group' does not exist.
 // Returns 'true' if successful.
-bool write_list(const std::string& name, const std::vector<std::string>& value);
+template <typename T>
+bool write_list(const std::string& name, const T& value);
 
 // write
 // Writes the attribute 'name' in the group default and assigns the list 'value'.
 // Returns 'true' if successful.
-bool write_list(const std::string& name, const std::vector<std::string>& value, const std::string& group);
+template <typename T>
+bool write_list(const std::string& name, const T& value, const std::string& group);
 
 
 
@@ -78,27 +80,29 @@ bool write_list(const std::string& name, const std::vector<std::string>& value,
 // Returns std::nullopt when not successful.
 [[nodiscard]] std::optional<std::string> get(const std::string& name) const;
 
-// get_list
+
+
+// get_list_as_vector
 // Returns the list-value of the attribute 'name' in the group 'group'
 // as std::vector.
 // Returns empty vector when not successful.
-[[nodiscard]] std::vector<std::string> get_list(const std::string& name, const std::string& group) const;
+std::vector<std::string> get_list_as_vector(const std::string& name, const std::string& group) const;
 
-// get_list
+// get_list_as_vector
 // Returns the list-value of the attribute 'name' in the group 'group'
 // as std::vector.
 // Returns empty vector when not successful.
-[[nodiscard]] std::vector<std::string> get_list(const std::string& name) const;
+std::vector<std::string> get_list_as_vector(const std::string& name) const;
 
 // get_raw_list
 // Returns the list-value as string of the attribute 'name' in the group 'group'
 // Returns std::nullopt when not successful.
-[[nodiscard]] std::optional<std::string> get_raw_list(const std::string& name) const;
+std::optional<std::string> get_raw_list(const std::string& name) const;
 
 // get_raw_list
 // Returns the list-value as string of the attribute 'name' in the group default
 // Returns std::nullopt when not successful.
-[[nodiscard]] std::optional<std::string> get_raw_list(const std::string& name, const std::string& group) const;
+std::optional<std::string> get_raw_list(const std::string& name, const std::string& group) const;