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2009-02-20 Benjamin Kosnik <bkoz@redhat.com>
[pf3gnuchains/gcc-fork.git] / libstdc++-v3 / include / tr1_impl / type_traits
diff --git a/libstdc++-v3/include/tr1_impl/type_traits b/libstdc++-v3/include/tr1_impl/type_traits
index 3a3d66f..cb0ad44 100644 (file)
--- a/libstdc++-v3/include/tr1_impl/type_traits
+++ b/libstdc++-v3/include/tr1_impl/type_traits
@@ -1,6 +1,6 @@
 // TR1 type_traits -*- C++ -*-
 
-// Copyright (C) 2007, 2008 Free Software Foundation, Inc.
+// Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
 //
 // This file is part of the GNU ISO C++ Library.  This library is free
 // software; you can redistribute it and/or modify it under the
@@ -36,6 +36,14 @@ namespace std
 {
 _GLIBCXX_BEGIN_NAMESPACE_TR1
 
+  /**
+   * @defgroup metaprogramming Type Traits
+   * @ingroup utilities
+   *
+   * Compile time type transformation and information.
+   * @{
+   */
+
   // For use in __is_convertible_simple.
   struct __sfinae_types
   {
@@ -43,31 +51,23 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
     typedef struct { char __arr[2]; } __two;
   };
 
-#define _DEFINE_SPEC_BODY(_Value)                                    \
+#define _DEFINE_SPEC_0_HELPER                          \
+  template<>
+
+#define _DEFINE_SPEC_1_HELPER                          \
+  template<typename _Tp>
+
+#define _DEFINE_SPEC_2_HELPER                          \
+  template<typename _Tp, typename _Cp>
+
+#define _DEFINE_SPEC(_Order, _Trait, _Type, _Value)    \
+  _DEFINE_SPEC_##_Order##_HELPER                       \
+    struct _Trait<_Type>                               \
     : public integral_constant<bool, _Value> { };
 
-#define _DEFINE_SPEC_0_HELPER(_Spec, _Value)                         \
-  template<>                                                         \
-    struct _Spec                                                     \
-    _DEFINE_SPEC_BODY(_Value)
-
-#define _DEFINE_SPEC_1_HELPER(_Spec, _Value)                         \
-  template<typename _Tp>                                             \
-    struct _Spec                                                     \
-    _DEFINE_SPEC_BODY(_Value)
-      
-#define _DEFINE_SPEC_2_HELPER(_Spec, _Value)                         \
-  template<typename _Tp, typename _Cp>                               \
-    struct _Spec                                                     \
-    _DEFINE_SPEC_BODY(_Value)
-
-#define _DEFINE_SPEC(_Order, _Trait, _Type, _Value)                  \
-  _DEFINE_SPEC_##_Order##_HELPER(_Trait<_Type>, _Value)              \
-  _DEFINE_SPEC_##_Order##_HELPER(_Trait<_Type const>, _Value)        \
-  _DEFINE_SPEC_##_Order##_HELPER(_Trait<_Type volatile>, _Value)     \
-  _DEFINE_SPEC_##_Order##_HELPER(_Trait<_Type const volatile>, _Value)
-
-  /// helper classes [4.3].
+  // helper classes [4.3].
+
+  /// integral_constant
   template<typename _Tp, _Tp __v>
     struct integral_constant
     {
@@ -79,49 +79,73 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
   /// typedef for true_type
   typedef integral_constant<bool, true>     true_type;
 
-  /// typedef for true_type
+  /// typedef for false_type
   typedef integral_constant<bool, false>    false_type;
 
   template<typename _Tp, _Tp __v>
     const _Tp integral_constant<_Tp, __v>::value;
 
-  /// primary type categories [4.5.1].
+  /// remove_cv
   template<typename>
-    struct is_void
+    struct remove_cv;
+
+  template<typename>
+    struct __is_void_helper
     : public false_type { };
-  _DEFINE_SPEC(0, is_void, void, true)
+  _DEFINE_SPEC(0, __is_void_helper, void, true)
+
+  // primary type categories [4.5.1].
+
+  /// is_void
+  template<typename _Tp>
+    struct is_void
+    : public integral_constant<bool, (__is_void_helper<typename
+                                     remove_cv<_Tp>::type>::value)>
+    { };
 
-  /// is_integral
   template<typename>
-    struct is_integral
+    struct __is_integral_helper
     : public false_type { };
-  _DEFINE_SPEC(0, is_integral, bool, true)
-  _DEFINE_SPEC(0, is_integral, char, true)
-  _DEFINE_SPEC(0, is_integral, signed char, true)
-  _DEFINE_SPEC(0, is_integral, unsigned char, true)
+  _DEFINE_SPEC(0, __is_integral_helper, bool, true)
+  _DEFINE_SPEC(0, __is_integral_helper, char, true)
+  _DEFINE_SPEC(0, __is_integral_helper, signed char, true)
+  _DEFINE_SPEC(0, __is_integral_helper, unsigned char, true)
 #ifdef _GLIBCXX_USE_WCHAR_T
-  _DEFINE_SPEC(0, is_integral, wchar_t, true)
+  _DEFINE_SPEC(0, __is_integral_helper, wchar_t, true)
 #endif
 #ifdef _GLIBCXX_INCLUDE_AS_CXX0X
-  _DEFINE_SPEC(0, is_integral, char16_t, true)
-  _DEFINE_SPEC(0, is_integral, char32_t, true)
+  _DEFINE_SPEC(0, __is_integral_helper, char16_t, true)
+  _DEFINE_SPEC(0, __is_integral_helper, char32_t, true)
 #endif
-  _DEFINE_SPEC(0, is_integral, short, true)
-  _DEFINE_SPEC(0, is_integral, unsigned short, true)
-  _DEFINE_SPEC(0, is_integral, int, true)
-  _DEFINE_SPEC(0, is_integral, unsigned int, true)
-  _DEFINE_SPEC(0, is_integral, long, true)
-  _DEFINE_SPEC(0, is_integral, unsigned long, true)
-  _DEFINE_SPEC(0, is_integral, long long, true)
-  _DEFINE_SPEC(0, is_integral, unsigned long long, true)
+  _DEFINE_SPEC(0, __is_integral_helper, short, true)
+  _DEFINE_SPEC(0, __is_integral_helper, unsigned short, true)
+  _DEFINE_SPEC(0, __is_integral_helper, int, true)
+  _DEFINE_SPEC(0, __is_integral_helper, unsigned int, true)
+  _DEFINE_SPEC(0, __is_integral_helper, long, true)
+  _DEFINE_SPEC(0, __is_integral_helper, unsigned long, true)
+  _DEFINE_SPEC(0, __is_integral_helper, long long, true)
+  _DEFINE_SPEC(0, __is_integral_helper, unsigned long long, true)
+
+  /// is_integral
+  template<typename _Tp>
+    struct is_integral
+    : public integral_constant<bool, (__is_integral_helper<typename
+                                     remove_cv<_Tp>::type>::value)>
+    { };
 
-  /// is_floating_point
   template<typename>
-    struct is_floating_point
+    struct __is_floating_point_helper
     : public false_type { };
-  _DEFINE_SPEC(0, is_floating_point, float, true)
-  _DEFINE_SPEC(0, is_floating_point, double, true)
-  _DEFINE_SPEC(0, is_floating_point, long double, true)
+  _DEFINE_SPEC(0, __is_floating_point_helper, float, true)
+  _DEFINE_SPEC(0, __is_floating_point_helper, double, true)
+  _DEFINE_SPEC(0, __is_floating_point_helper, long double, true)
+
+  /// is_floating_point
+  template<typename _Tp>
+    struct is_floating_point
+    : public integral_constant<bool, (__is_floating_point_helper<typename
+                                     remove_cv<_Tp>::type>::value)>
+    { };
 
   /// is_array
   template<typename>
@@ -136,11 +160,17 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
     struct is_array<_Tp[]>
     : public true_type { };
 
-  /// is_pointer
   template<typename>
-    struct is_pointer
+    struct __is_pointer_helper
     : public false_type { };
-  _DEFINE_SPEC(1, is_pointer, _Tp*, true)
+  _DEFINE_SPEC(1, __is_pointer_helper, _Tp*, true)
+
+  /// is_pointer
+  template<typename _Tp>
+    struct is_pointer
+    : public integral_constant<bool, (__is_pointer_helper<typename
+                                     remove_cv<_Tp>::type>::value)>
+    { };
 
   /// is_reference
   template<typename _Tp>
@@ -150,20 +180,32 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
   template<typename _Tp>
     struct is_function;
 
-  /// is_member_object_pointer
   template<typename>
-    struct is_member_object_pointer
+    struct __is_member_object_pointer_helper
     : public false_type { };
-  _DEFINE_SPEC(2, is_member_object_pointer, _Tp _Cp::*,
+  _DEFINE_SPEC(2, __is_member_object_pointer_helper, _Tp _Cp::*,
               !is_function<_Tp>::value)
 
-  /// is_member_function_pointer
+  /// is_member_object_pointer
+  template<typename _Tp>
+    struct is_member_object_pointer
+    : public integral_constant<bool, (__is_member_object_pointer_helper<
+                                     typename remove_cv<_Tp>::type>::value)>
+    { };
+
   template<typename>
-    struct is_member_function_pointer
+    struct __is_member_function_pointer_helper
     : public false_type { };
-  _DEFINE_SPEC(2, is_member_function_pointer, _Tp _Cp::*,
+  _DEFINE_SPEC(2, __is_member_function_pointer_helper, _Tp _Cp::*,
               is_function<_Tp>::value)
 
+  /// is_member_function_pointer
+  template<typename _Tp>
+    struct is_member_function_pointer
+    : public integral_constant<bool, (__is_member_function_pointer_helper<
+                                     typename remove_cv<_Tp>::type>::value)>
+    { };
+
   /// is_enum
   template<typename _Tp>
     struct is_enum
@@ -182,9 +224,6 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
     : public integral_constant<bool, __is_class(_Tp)>
     { };
 
-  template<typename _Tp>
-    struct remove_cv;
-
   template<typename>
     struct __is_function_helper
     : public false_type { };
@@ -204,7 +243,9 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
                                      remove_cv<_Tp>::type>::value)>
     { };
 
-  /// composite type traits [4.5.2].
+  // composite type traits [4.5.2].
+  
+  /// is_arithmetic
   template<typename _Tp>
     struct is_arithmetic
     : public integral_constant<bool, (is_integral<_Tp>::value
@@ -252,12 +293,12 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
                                || is_member_function_pointer<_Tp>::value)>
     { };
 
-  /// type properties [4.5.3].
+  // type properties [4.5.3].
+  /// is_const
   template<typename>
     struct is_const
     : public false_type { };
 
-  /// is_const
   template<typename _Tp>
     struct is_const<_Tp const>
     : public true_type { };
@@ -332,7 +373,9 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
                                                       _Uint - 1>::value>
     { };
 
-  /// relationships between types [4.6].
+  // relationships between types [4.6].
+
+  /// is_same
   template<typename, typename>
     struct is_same
     : public false_type { };
@@ -341,7 +384,9 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
     struct is_same<_Tp, _Tp>
     : public true_type { };
 
-  /// const-volatile modifications [4.7.1].
+  // const-volatile modifications [4.7.1].
+
+  /// remove_const
   template<typename _Tp>
     struct remove_const
     { typedef _Tp     type; };
@@ -385,7 +430,9 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
       add_const<typename add_volatile<_Tp>::type>::type     type;
     };
 
-  /// array modifications [4.7.3].
+  // array modifications [4.7.3].
+
+  /// remove_extent
   template<typename _Tp>
     struct remove_extent
     { typedef _Tp     type; };
@@ -411,19 +458,23 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
     struct remove_all_extents<_Tp[]>
     { typedef typename remove_all_extents<_Tp>::type     type; };
 
-  /// pointer modifications [4.7.4].
-#undef _DEFINE_SPEC_BODY
-#define _DEFINE_SPEC_BODY(_Value)      \
+  // pointer modifications [4.7.4].
+
+  template<typename _Tp, typename>
+    struct __remove_pointer_helper
     { typedef _Tp     type; };
 
+  template<typename _Tp, typename _Up>
+    struct __remove_pointer_helper<_Tp, _Up*>
+    { typedef _Up     type; };
+
   /// remove_pointer
   template<typename _Tp>
     struct remove_pointer
-    { typedef _Tp     type; };
-  _DEFINE_SPEC(1, remove_pointer, _Tp*, false)
+    : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
+    { };
 
-  /// remove_reference
-  template<typename _Tp>
+  template<typename>
     struct remove_reference;
 
   /// add_pointer
@@ -435,7 +486,7 @@ _GLIBCXX_BEGIN_NAMESPACE_TR1
 #undef _DEFINE_SPEC_1_HELPER
 #undef _DEFINE_SPEC_2_HELPER
 #undef _DEFINE_SPEC
-#undef _DEFINE_SPEC_BODY
 
+  // @} group metaprogramming
 _GLIBCXX_END_NAMESPACE_TR1
 }
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