Fix signatures of placement operator delete in places where placement

delete is declared. As we don't use exceptions placement delete is never 
called and the fix only affects numerous warnings when
compiling with MS Visual C++.
For more info see http://www.gotw.ca/gotw/010.htm.


sql/item.h:
  Fix the signature of placement operator delete for class Item.
sql/sql_class.cc:
  Add placement delete operator to suppress a warning under Windows.
sql/sql_lex.h:
  Fix the signature of placement operator delete for class LEX
sql/sql_list.h:
  Fix the signature of placement operator delete for class Sql_alloc
sql/sql_string.h:
  Fix the signature of placement operator delete for class Sql_string

1 files changed, 2 insertions, 2 deletions

diff --git a/sql/sql_list.h b/sql/sql_list.h
index a607b31d60c..be3e29b0c62 100644
--- a/sql/sql_list.h
+++ b/sql/sql_list.h
@@ -41,8 +41,8 @@ public:
   static void *operator new(size_t size, MEM_ROOT *mem_root)
   { return (void*) alloc_root(mem_root, (uint) size); }
   static void operator delete(void *ptr, size_t size) { TRASH(ptr, size); }
-  static void operator delete(void *ptr, size_t size, MEM_ROOT *mem_root)
-  { TRASH(ptr, size); }
+  static void operator delete(void *ptr, MEM_ROOT *mem_root)
+  { /* never called */ }
   static void operator delete[](void *ptr, size_t size) { TRASH(ptr, size); }
 #ifdef HAVE_purify
   bool dummy;