[cfe-dev] Libcxx marco using question
罗勇刚(Yonggang Luo)
luoyonggang at gmail.com
Thu Sep 9 04:09:16 PDT 2010
Index: type_traits
===================================================================
--- type_traits (revision 113464)
+++ type_traits (working copy)
@@ -264,28 +264,32 @@
template <class _Tp> struct is_reference<_Tp&&> : public true_type {};
#endif
+#if defined(__clang__) || (__GNUC__ > 4) || (__GNUC__==4 && __GNUC_MINOR__ >=3)
+#define _LIBCPP_HAS_TYPE_TRAITS
+#endif
+
// is_union
-#if __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#ifdef _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct is_union
: public integral_constant<bool, __is_union(_Tp)> {};
-#else // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#else // _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct __libcpp_union : public false_type {};
template <class _Tp> struct is_union : public __libcpp_union<typename
remove_cv<_Tp>::type> {};
-#endif // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#endif // _LIBCPP_HAS_TYPE_TRAITS
// is_class
-#if __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#ifdef _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct is_class
: public integral_constant<bool, __is_class(_Tp)> {};
-#else // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#else // _LIBCPP_HAS_TYPE_TRAITS
namespace __is_class_imp
{
@@ -296,7 +300,7 @@
template <class _Tp> struct is_class
: public integral_constant<bool,
sizeof(__is_class_imp::__test<_Tp>(0)) == 1 && !is_union<_Tp>::value>
{};
-#endif // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#endif // _LIBCPP_HAS_TYPE_TRAITS
// is_function
@@ -342,12 +346,12 @@
// is_enum
-#if __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#ifdef _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct is_enum
: public integral_constant<bool, __is_enum(_Tp)> {};
-#else // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#else // _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct is_enum
: public integral_constant<bool, !is_void<_Tp>::value &&
@@ -361,7 +365,7 @@
!is_class<_Tp>::value &&
!is_function<_Tp>::value > {};
-#endif // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#endif // _LIBCPP_HAS_TYPE_TRAITS
// is_arithmetic
@@ -742,12 +746,12 @@
// has_trivial_default_constructor
-#if __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#ifdef _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_trivial_default_constructor
: public integral_constant<bool, __has_trivial_constructor(_Tp)> {};
-#else // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#else // _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct __has_trivial_default_constructor
: public integral_constant<bool, is_scalar<_Tp>::value> {};
@@ -755,94 +759,92 @@
template <class _Tp> struct has_trivial_default_constructor
: public __has_trivial_default_constructor<typename
remove_all_extents<_Tp>::type> {};
-#endif // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#endif // _LIBCPP_HAS_TYPE_TRAITS
// has_nothrow_default_constructor
-#if __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#ifdef _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_nothrow_default_constructor
: public integral_constant<bool, __has_nothrow_constructor(_Tp)> {};
-#else // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#else // _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_nothrow_default_constructor
: public has_trivial_default_constructor<_Tp> {};
-#endif // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#endif // _LIBCPP_HAS_TYPE_TRAITS
// has_trivial_copy_constructor
-#if __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#ifdef _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_trivial_copy_constructor
: public integral_constant<bool, __has_trivial_copy(_Tp)> {};
-#else // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#else // _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_trivial_copy_constructor
: public integral_constant<bool, is_scalar<_Tp>::value ||
is_reference<_Tp>::value> {};
+#endif // _LIBCPP_HAS_TYPE_TRAITS
-#endif // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
-
// has_nothrow_copy_constructor
-#if __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#ifdef _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_nothrow_copy_constructor
: public integral_constant<bool, __has_nothrow_copy(_Tp)> {};
-#else // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#else // _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_nothrow_copy_constructor
: public has_trivial_copy_constructor<_Tp> {};
-#endif // __GNUC__ >= 4 && __GNUC_MINOR__ >= 3 || defined(__clang__)
+#endif // _LIBCPP_HAS_TYPE_TRAITS
-
// has_nothrow_move_constructor
template <class _Tp> struct has_nothrow_move_constructor : public
has_nothrow_copy_constructor<_Tp> {};
// has_trivial_copy_assign
-#if defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#ifdef _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_trivial_copy_assign
: public integral_constant<bool, __has_trivial_assign(_Tp)> {};
-#else
+#else // _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_trivial_copy_assign
: public integral_constant<bool, is_scalar<_Tp>::value &&
!is_const<_Tp>::value> {};
-#endif // defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#endif // _LIBCPP_HAS_TYPE_TRAITS
// has_nothrow_copy_assign
-#if defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#ifdef _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_nothrow_copy_assign
: public integral_constant<bool, __has_nothrow_assign(_Tp)> {};
-#else // defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#else // _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_nothrow_copy_assign
: public has_trivial_copy_assign<_Tp> {};
-#endif // defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#endif // _LIBCPP_HAS_TYPE_TRAITS
// has_trivial_destructor
-#if defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#ifdef _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_trivial_destructor
: public integral_constant<bool, __has_trivial_destructor(_Tp)> {};
-#else // defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#else // _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct __libcpp_trivial_destructor
: public integral_constant<bool, is_scalar<_Tp>::value ||
@@ -851,36 +853,36 @@
template <class _Tp> struct has_trivial_destructor
: public __libcpp_trivial_destructor<typename
remove_all_extents<_Tp>::type> {};
-#endif // defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#endif // _LIBCPP_HAS_TYPE_TRAITS
// has_virtual_destructor
-#if defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#ifdef _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_virtual_destructor
: public integral_constant<bool, __has_virtual_destructor(_Tp)> {};
-#else // defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#else // _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct has_virtual_destructor : public false_type {};
-#endif // defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#endif // _LIBCPP_HAS_TYPE_TRAITS
// is_pod
-#if defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#ifdef _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct is_pod
: public integral_constant<bool, __is_pod(_Tp)> {};
-#else // defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#else // _LIBCPP_HAS_TYPE_TRAITS
template <class _Tp> struct is_pod : public integral_constant<bool,
has_trivial_default_constructor<_Tp>::value &&
has_trivial_copy_constructor<_Tp>::value &&
has_trivial_copy_assign<_Tp>::value &&
has_trivial_destructor<_Tp>::value> {};
-#endif // defined(__clang__) || (__GNUC__ >= 4 && __GNUC_MINOR__ >= 3)
+#endif // _LIBCPP_HAS_TYPE_TRAITS
// alignment_of
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