From 4dc0c488f94a5f0c7ae04fd15b46a92c20fb03fa Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Sun, 4 Jan 2015 15:16:56 +0100
Subject: cmDeleteAll: Generalize deletion specialization for map types.

Assume that a container whose value_type is a std::pair should have
its second member deleted.
---
 Source/cmStandardIncludes.h | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/Source/cmStandardIncludes.h b/Source/cmStandardIncludes.h
index 251a043..646300d 100644
--- a/Source/cmStandardIncludes.h
+++ b/Source/cmStandardIncludes.h
@@ -239,7 +239,20 @@ private:
 
 namespace ContainerAlgorithms {
 
-template<typename Container>
+template<typename T>
+struct cmIsPair
+{
+  enum { value = false };
+};
+
+template<typename K, typename V>
+struct cmIsPair<std::pair<K, V> >
+{
+  enum { value = true };
+};
+
+template<typename Container,
+    bool valueTypeIsPair = cmIsPair<typename Container::value_type>::value>
 struct DefaultDeleter
 {
   void operator()(typename Container::value_type value) {
@@ -247,10 +260,10 @@ struct DefaultDeleter
   }
 };
 
-template<typename K, typename V>
-struct DefaultDeleter<std::map<K, V> >
+template<typename Container>
+struct DefaultDeleter<Container, /* valueTypeIsPair = */ true>
 {
-  void operator()(typename std::map<K, V>::value_type value) {
+  void operator()(typename Container::value_type value) {
     delete value.second;
   }
 };
-- 
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