[complement-svn] SF.net SVN: complement:[1962] trunk/complement/explore

[<com...@us...>]

Revision: 1962
          http://complement.svn.sourceforge.net/complement/?rev=1962&view=rev
Author:   complement
Date:     2008-09-08 19:54:51 +0000 (Mon, 08 Sep 2008)

Log Message:
-----------
add enable_if, conditional and decay

Use some things that I made for STLport; useful when no STLport
and gcc before 4.x.

Modified Paths:
--------------
    trunk/complement/explore/include/misc/type_traits.h
    trunk/complement/explore/lib/misc/ChangeLog

Modified: trunk/complement/explore/include/misc/type_traits.h
===================================================================
--- trunk/complement/explore/include/misc/type_traits.h	2008-09-08 19:54:20 UTC (rev 1961)
+++ trunk/complement/explore/include/misc/type_traits.h	2008-09-08 19:54:51 UTC (rev 1962)
@@ -707,6 +707,67 @@
 
 // aligned_storage
 
+namespace detail {
+
+template <bool,class _U>
+struct _decay_aux2
+{
+    typedef typename remove_cv<_U>::type type;
+};
+
+template <class _U>
+struct _decay_aux2<true,_U>
+{
+    typedef typename add_pointer<_U>::type type;
+};
+
+template <bool, class _U>
+struct _decay_aux1
+{
+    typedef typename _decay_aux2<is_function<_U>::value,_U>::type type;
+};
+
+template <class _U>
+struct _decay_aux1<true,_U>
+{
+    typedef typename remove_extent<_U>::type* type;
+};
+
+} // namespace detail
+
+template <class _Tp>
+class decay
+{
+  private:
+    typedef typename remove_reference<_Tp>::type _U;
+
+  public:
+    typedef typename detail::_decay_aux1<is_array<_U>::value,_U>::type type;
+};
+
+template <bool, class _Tp = void>
+struct enable_if
+{
+};
+
+template <class _Tp>
+struct enable_if<true,_Tp>
+{
+    typedef _Tp type;
+};
+
+template <bool, class _Tp1, class _Tp2>
+struct conditional
+{
+    typedef _Tp2 type;
+};
+
+template <class _Tp1, class _Tp2>
+struct conditional<true,_Tp1,_Tp2>
+{
+    typedef _Tp1 type;
+};
+
 #undef __CV_SPEC
 #undef __SPEC_
 #undef __CV_SPEC_1

Modified: trunk/complement/explore/lib/misc/ChangeLog
===================================================================
--- trunk/complement/explore/lib/misc/ChangeLog	2008-09-08 19:54:20 UTC (rev 1961)
+++ trunk/complement/explore/lib/misc/ChangeLog	2008-09-08 19:54:51 UTC (rev 1962)
@@ -1,3 +1,8 @@
+2008-09-08  Petr Ovtchenkov  <pt...@vo...>
+
+	* type_traits.h: add enable_if, conditional and decay;
+	useful when no STLport and gcc before 4.x.
+
 2008-07-21  Petr Ovtchenkov  <pt...@is...>
 
 	* type_traits.h: fix STLport version; use type_traits


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