From 7c18314e94b8332dea708e0967041552df8a16ea Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Tue, 25 Apr 2017 11:51:39 -0600
Subject: [PATCH] Simplify memory management in Patterns::List/Map.

---
 include/deal.II/base/parameter_handler.h | 16 +++-------------
 source/base/parameter_handler.cc         | 19 -------------------
 2 files changed, 3 insertions(+), 32 deletions(-)

diff --git a/include/deal.II/base/parameter_handler.h b/include/deal.II/base/parameter_handler.h
index 3eb4225351..1b5867af30 100644
--- a/include/deal.II/base/parameter_handler.h
+++ b/include/deal.II/base/parameter_handler.h
@@ -419,11 +419,6 @@ namespace Patterns
      */
     List (const List &other);
 
-    /**
-     * Destructor.
-     */
-    virtual ~List ();
-
     /**
      * Return <tt>true</tt> if the string is a comma-separated list of strings
      * each of which match the pattern given to the constructor.
@@ -473,7 +468,7 @@ namespace Patterns
     /**
      * Copy of the pattern that each element of the list has to satisfy.
      */
-    PatternBase *pattern;
+    std::unique_ptr<PatternBase> pattern;
 
     /**
      * Minimum number of elements the list must have.
@@ -539,11 +534,6 @@ namespace Patterns
      */
     Map (const Map &other);
 
-    /**
-     * Destructor.
-     */
-    virtual ~Map ();
-
     /**
      * Return <tt>true</tt> if the string is a comma-separated list of strings
      * each of which match the pattern given to the constructor.
@@ -594,8 +584,8 @@ namespace Patterns
      * Copy of the patterns that each key and each value of the map has to
      * satisfy.
      */
-    PatternBase *key_pattern;
-    PatternBase *value_pattern;
+    std::unique_ptr<PatternBase> key_pattern;
+    std::unique_ptr<PatternBase> value_pattern;
 
     /**
      * Minimum number of elements the list must have.
diff --git a/source/base/parameter_handler.cc b/source/base/parameter_handler.cc
index d1c613e77f..7bf9f1edc9 100644
--- a/source/base/parameter_handler.cc
+++ b/source/base/parameter_handler.cc
@@ -597,14 +597,6 @@ namespace Patterns
 
 
 
-  List::~List ()
-  {
-    delete pattern;
-    pattern = nullptr;
-  }
-
-
-
   bool List::match (const std::string &test_string_list) const
   {
     std::string tmp = test_string_list;
@@ -788,17 +780,6 @@ namespace Patterns
 
 
 
-  Map::~Map ()
-  {
-    delete key_pattern;
-    key_pattern = nullptr;
-
-    delete value_pattern;
-    value_pattern = nullptr;
-  }
-
-
-
   bool Map::match (const std::string &test_string_list) const
   {
     std::string tmp = test_string_list;
-- 
2.39.5