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Fix PR#25973 : 'basic_string::assign(InputIt, InputIt) doesn't provide the strong exception safety guarantee'. This turned out to be a pervasive problem in <string>, which required a fair amount of rework. Add in an optimization for when iterators provide noexcept increment/comparison/assignment/dereference (which covers many of the iterators in libc++). Reviewed as http://reviews.llvm.org/D15862

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@257682 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2016-01-13 21:54:34 +00:00
parent b27535c0c3
commit df9db31c27
43 changed files with 771 additions and 112 deletions
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23
include/iterator
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@@ -437,6 +437,12 @@ struct __is_bidirectional_iterator : public __has_iterator_category_convertible_
template <class _Tp>
struct __is_random_access_iterator : public __has_iterator_category_convertible_to<_Tp, random_access_iterator_tag> {};
template <class _Tp>
struct __is_exactly_input_iterator
: public integral_constant<bool,
__has_iterator_category_convertible_to<_Tp, input_iterator_tag>::value &&
!__has_iterator_category_convertible_to<_Tp, forward_iterator_tag>::value> {};
template<class _Category, class _Tp, class _Distance = ptrdiff_t,
class _Pointer = _Tp*, class _Reference = _Tp&>
struct _LIBCPP_TYPE_VIS_ONLY iterator
@@ -1404,6 +1410,23 @@ operator+(typename __wrap_iter<_Iter>::difference_type __n,
return __x;
}
template <class _Iter>
struct __libcpp_is_trivial_iterator
: public _LIBCPP_BOOL_CONSTANT(is_pointer<_Iter>::value) {};
template <class _Iter>
struct __libcpp_is_trivial_iterator<move_iterator<_Iter> >
: public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
template <class _Iter>
struct __libcpp_is_trivial_iterator<reverse_iterator<_Iter> >
: public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
template <class _Iter>
struct __libcpp_is_trivial_iterator<__wrap_iter<_Iter> >
: public _LIBCPP_BOOL_CONSTANT(__libcpp_is_trivial_iterator<_Iter>::value) {};
template <class _Tp, size_t _Np>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
_Tp*