malloc_allocator.h: Fixed the construct function to call global placement new…

malloc_allocator.h: Fixed the construct function to call global placement new instead of assignment.


2004-03-24  Dhruv Matani  <dhruvbird@gmx.net>

	* ext/malloc_allocator.h: Fixed the construct function to call
	global placement new instead of assignment. Added a check after
	the return from malloc to check whether returned pointer is NULL,
	and if so, throw std::bad_alloc().
	* ext/debug_allocator.h: Added a check in the deallocate function
	to check whether the user has passed a NULL pointer or not.

From-SVN: r79934

libstdc++-v3/ChangeLog

+2004-03-24  Dhruv Matani  <dhruvbird@gmx.net>
+
+	* ext/malloc_allocator.h: Fixed the construct function to call
+	global placement new instead of assignment. Added a check after
+	the return from malloc to check whether returned pointer is NULL,
+	and if so, throw std::bad_alloc().
+	* ext/debug_allocator.h: Added a check in the deallocate function
+	to check whether the user has passed a NULL pointer or not.
+	
 2004-03-24  Benjamin Kosnik  <bkoz@redhat.com>
 
 	* docs/html/20_util/allocator.html: Add bitmap_allocator links.

libstdc++-v3/include/ext/debug_allocator.h

@@ -108,7 +108,9 @@ namespace __gnu_cxx
       void
       deallocate(pointer __p, size_type __n)
       {
-        pointer __real_p = __p - _M_extra;
+	if (!__p)
+	  abort();
+	pointer __real_p = __p - _M_extra;
         if (*reinterpret_cast<size_type*>(__real_p) != __n)
           abort();
         _M_allocator.deallocate(__real_p, __n + _M_extra);

libstdc++-v3/include/ext/malloc_allocator.h

@@ -78,7 +78,12 @@ namespace __gnu_cxx
       // about what the return value is when __n == 0.
       pointer
       allocate(size_type __n, const void* = 0)
-      { return static_cast<_Tp*>(malloc(__n * sizeof(_Tp))); }
+      {
+	pointer __ret = static_cast<_Tp*>(malloc(__n * sizeof(_Tp)));
+	if (!__ret)
+	  throw std::bad_alloc();
+	return __ret;
+      }
 
       // __p is not permitted to be a null pointer.
       void
@@ -93,7 +98,7 @@ namespace __gnu_cxx
       // 402. wrong new expression in [some_] allocator::construct
       void 
       construct(pointer __p, const _Tp& __val) 
-      { *__p = __val; }
+      { ::new(__p) value_type(__val); }
 
       void 
       destroy(pointer __p) { __p->~_Tp(); }