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re PR libstdc++/45549 (merge is_iterator into iterator_traits)

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2010-09-07  Paolo Carlini  <paolo.carlini@oracle.com>
	    Marc Glisse  <marc.glisse@normalesup.org>

	PR libstdc++/45549
	* include/bits/cpp_type_traits.h (__is_iterator_helper): Rename to
	__has_iterator_category.
	(__is_iterator): Adjust.
	* include/bits/stl_iterator_base_types.h (__iterator_traits): Add
	in C++0x mode, use the latter.
	(iterator_traits): In C++0x mode, derive from the latter.
	* include/bits/stl_iterator_base_funcs.h (next, prev): Remove
	enable_if on the return type.

Co-Authored-By: Marc Glisse <marc.glisse@normalesup.org>

From-SVN: r163977
This commit is contained in:
Paolo Carlini 2010-09-07 22:30:33 +00:00 committed by Paolo Carlini
parent 16c0e29509
commit ccef29e831
4 changed files with 45 additions and 18 deletions
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13
libstdc++-v3/ChangeLog
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@ -1,3 +1,16 @@
2010-09-07 Paolo Carlini <paolo.carlini@oracle.com>
Marc Glisse <marc.glisse@normalesup.org>
PR libstdc++/45549
* include/bits/cpp_type_traits.h (__is_iterator_helper): Rename to
__has_iterator_category.
(__is_iterator): Adjust.
* include/bits/stl_iterator_base_types.h (__iterator_traits): Add
in C++0x mode, use the latter.
(iterator_traits): In C++0x mode, derive from the latter.
* include/bits/stl_iterator_base_funcs.h (next, prev): Remove
enable_if on the return type.
2010-09-07 Paolo Carlini <paolo.carlini@oracle.com>
PR libstdc++/45398

8
libstdc++-v3/include/bits/cpp_type_traits.h
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@ -415,7 +415,7 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
#endif
template<typename _Tp>
class __is_iterator_helper
class __has_iterator_category
{
typedef char __one;
typedef struct { char __arr[2]; } __two;
@ -431,14 +431,14 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
static __two __test(...);
public:
static const bool __value = (sizeof(__test<_Tp>(0)) == 1
|| __is_pointer<_Tp>::__value);
static const bool __value = sizeof(__test<_Tp>(0)) == 1;
};
template<typename _Tp>
struct __is_iterator
{
enum { __value = __is_iterator_helper<_Tp>::__value };
enum { __value = (__has_iterator_category<_Tp>::__value
|| __is_pointer<_Tp>::__value) };
typedef typename __truth_type<__value>::__type __type;
};

18
libstdc++-v3/include/bits/stl_iterator_base_funcs.h
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@ -173,18 +173,10 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
std::__advance(__i, __d, std::__iterator_category(__i));
}
_GLIBCXX_END_NAMESPACE
#ifdef __GXX_EXPERIMENTAL_CXX0X__
#include <ext/type_traits.h> // For __enable_if and __is_iterator
_GLIBCXX_BEGIN_NAMESPACE(std)
template<typename _ForwardIterator>
inline typename
__gnu_cxx::__enable_if<__is_iterator<_ForwardIterator>::__value,
_ForwardIterator>::__type
inline _ForwardIterator
next(_ForwardIterator __x, typename
iterator_traits<_ForwardIterator>::difference_type __n = 1)
{
@ -193,9 +185,7 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
}
template<typename _BidirectionalIterator>
inline typename
__gnu_cxx::__enable_if<__is_iterator<_BidirectionalIterator>::__value,
_BidirectionalIterator>::__type
inline _BidirectionalIterator
prev(_BidirectionalIterator __x, typename
iterator_traits<_BidirectionalIterator>::difference_type __n = 1)
{
@ -203,8 +193,8 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
return __x;
}
_GLIBCXX_END_NAMESPACE
#endif // __GXX_EXPERIMENTAL_CXX0X__
_GLIBCXX_END_NAMESPACE
#endif /* _STL_ITERATOR_BASE_FUNCS_H */

24
libstdc++-v3/include/bits/stl_iterator_base_types.h
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@ -64,6 +64,10 @@
#include <bits/c++config.h>
#ifdef __GXX_EXPERIMENTAL_CXX0X__
# include <bits/cpp_type_traits.h> // For __has_iterator_category
#endif
_GLIBCXX_BEGIN_NAMESPACE(std)
/**
@ -132,6 +136,25 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
* argument. Specialized versions for pointers and pointers-to-const
* provide tighter, more correct semantics.
*/
#ifdef __GXX_EXPERIMENTAL_CXX0X__
template<typename _Iterator,
bool = __has_iterator_category<_Iterator>::__value>
struct __iterator_traits { };
template<typename _Iterator>
struct __iterator_traits<_Iterator, true>
{
typedef typename _Iterator::iterator_category iterator_category;
typedef typename _Iterator::value_type value_type;
typedef typename _Iterator::difference_type difference_type;
typedef typename _Iterator::pointer pointer;
typedef typename _Iterator::reference reference;
};
template<typename _Iterator>
struct iterator_traits
: public __iterator_traits<_Iterator> { };
#else
template<typename _Iterator>
struct iterator_traits
{
@ -141,6 +164,7 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
typedef typename _Iterator::pointer pointer;
typedef typename _Iterator::reference reference;
};
#endif
/// Partial specialization for pointer types.
template<typename _Tp>