howto.html: Add entry for DR 253 [Ready].

2004-03-12  Paolo Carlini  <pcarlini@suse.de>

	* docs/html/ext/howto.html: Add entry for DR 253 [Ready].
	* include/bits/gslice_array.h: Add comment about DR 253.
	* include/bits/indirect_array.h: Likewise.
	* include/bits/mask_array.h: Likewise.
	* include/bits/slice_array.h: Likewise.

From-SVN: r79412

libstdc++-v3/ChangeLog

+2004-03-12  Paolo Carlini  <pcarlini@suse.de>
+
+	* docs/html/ext/howto.html: Add entry for DR 253 [Ready].
+	* include/bits/gslice_array.h: Add comment about DR 253.
+	* include/bits/indirect_array.h: Likewise.
+	* include/bits/mask_array.h: Likewise.
+	* include/bits/slice_array.h: Likewise.
+
 2004-03-12  Benjamin Kosnik  <bkoz@redhat.com>
 
 	* testsuite/20_util/allocator/14176.cc: New.

libstdc++-v3/docs/html/ext/howto.html

@@ -412,6 +412,14 @@
     <dd>This nested typdef was originally not specified.
     </dd>
 
+    <dt><a href="lwg-active.html#253">253</a>:
+        <em>valarray helper functions are almost entirely useless</em>
+    </dt>
+    <dd>Make the copy constructor and copy-assignment operator declarations
+        public in gslice_array, indirect_array, mask_array, slice_array; provide
+	definitions.
+    </dd>
+
     <dt><a href="lwg-defects.html#265">265</a>:
         <em>std::pair::pair() effects overly restrictive</em>
     </dt>

libstdc++-v3/include/bits/gslice_array.h

@@ -61,11 +61,12 @@ namespace std {
     public:
       typedef _Tp value_type;
 
-      // this constructor needs to be implemented.
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 253. valarray helper functions are almost entirely useless
+
       ///  Copy constructor.  Both slices refer to the same underlying array.
       gslice_array(const gslice_array&);
 
-      // This operator must be public.  See DR-253.
       ///  Assignment operator.  Assigns slice elements to corresponding
       ///  elements of @a a.
       gslice_array& operator=(const gslice_array&);

libstdc++-v3/include/bits/indirect_array.h

@@ -63,11 +63,12 @@ namespace std
     public:
       typedef _Tp value_type;
 
-      // this constructor needs to be implemented.
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 253. valarray helper functions are almost entirely useless
+
       ///  Copy constructor.  Both slices refer to the same underlying array.
       indirect_array(const indirect_array&);
 
-      // XXX: This is a proposed resolution for DR-253.
       ///  Assignment operator.  Assigns elements to corresponding elements
       ///  of @a a.
       indirect_array& operator=(const indirect_array&);

libstdc++-v3/include/bits/mask_array.h

@@ -63,11 +63,12 @@ namespace std {
     public:
       typedef _Tp value_type;
 
-      // this constructor needs to be implemented.
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 253. valarray helper functions are almost entirely useless
+
       ///  Copy constructor.  Both slices refer to the same underlying array.
       mask_array (const mask_array&);
       
-      // This operator must be public.  See DR-253.
       ///  Assignment operator.  Assigns elements to corresponding elements
       ///  of @a a.
       mask_array& operator=(const mask_array&);

libstdc++-v3/include/bits/slice_array.h

@@ -123,11 +123,12 @@ namespace std
     public:
       typedef _Tp value_type;
 
-      // This constructor is implemented since we need to return a value.
+      // _GLIBCXX_RESOLVE_LIB_DEFECTS
+      // 253. valarray helper functions are almost entirely useless
+
       ///  Copy constructor.  Both slices refer to the same underlying array.
       slice_array(const slice_array&);
 
-      // This operator must be public.  See DR-253.
       ///  Assignment operator.  Assigns slice elements to corresponding
       ///  elements of @a a.
       slice_array& operator=(const slice_array&);