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llvm-project/libcxx/include/__iterator/wrap_iter.h

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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ITERATOR_WRAP_ITER_H
#define _LIBCPP___ITERATOR_WRAP_ITER_H
#include <__config>
#include <__debug>
#include <__iterator/iterator_traits.h>
#include <__memory/addressof.h>
#include <__memory/pointer_traits.h>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Iter>
class __wrap_iter
{
public:
typedef _Iter iterator_type;
typedef typename iterator_traits<iterator_type>::value_type value_type;
typedef typename iterator_traits<iterator_type>::difference_type difference_type;
typedef typename iterator_traits<iterator_type>::pointer pointer;
typedef typename iterator_traits<iterator_type>::reference reference;
typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
#if _LIBCPP_STD_VER > 17
typedef contiguous_iterator_tag iterator_concept;
#endif
private:
iterator_type __i;
public:
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 __wrap_iter() _NOEXCEPT
: __i()
{
_VSTD::__debug_db_insert_i(this);
}
template <class _Up> _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
__wrap_iter(const __wrap_iter<_Up>& __u,
typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = nullptr) _NOEXCEPT
: __i(__u.base())
{
#ifdef _LIBCPP_ENABLE_DEBUG_MODE
if (!__libcpp_is_constant_evaluated())
__get_db()->__iterator_copy(this, _VSTD::addressof(__u));
#endif
}
#ifdef _LIBCPP_ENABLE_DEBUG_MODE
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
__wrap_iter(const __wrap_iter& __x)
: __i(__x.base())
{
if (!__libcpp_is_constant_evaluated())
__get_db()->__iterator_copy(this, _VSTD::addressof(__x));
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
__wrap_iter& operator=(const __wrap_iter& __x)
{
if (this != _VSTD::addressof(__x))
{
if (!__libcpp_is_constant_evaluated())
__get_db()->__iterator_copy(this, _VSTD::addressof(__x));
__i = __x.__i;
}
return *this;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX17
~__wrap_iter()
{
if (!__libcpp_is_constant_evaluated())
__get_db()->__erase_i(this);
}
#endif
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 reference operator*() const _NOEXCEPT
{
_LIBCPP_DEBUG_ASSERT(__get_const_db()->__dereferenceable(this),
"Attempted to dereference a non-dereferenceable iterator");
return *__i;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 pointer operator->() const _NOEXCEPT
{
_LIBCPP_DEBUG_ASSERT(__get_const_db()->__dereferenceable(this),
"Attempted to dereference a non-dereferenceable iterator");
return _VSTD::__to_address(__i);
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 __wrap_iter& operator++() _NOEXCEPT
{
_LIBCPP_DEBUG_ASSERT(__get_const_db()->__dereferenceable(this),
"Attempted to increment a non-incrementable iterator");
++__i;
return *this;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 __wrap_iter operator++(int) _NOEXCEPT
{__wrap_iter __tmp(*this); ++(*this); return __tmp;}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 __wrap_iter& operator--() _NOEXCEPT
{
_LIBCPP_DEBUG_ASSERT(__get_const_db()->__decrementable(this),
"Attempted to decrement a non-decrementable iterator");
--__i;
return *this;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 __wrap_iter operator--(int) _NOEXCEPT
{__wrap_iter __tmp(*this); --(*this); return __tmp;}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 __wrap_iter operator+ (difference_type __n) const _NOEXCEPT
{__wrap_iter __w(*this); __w += __n; return __w;}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 __wrap_iter& operator+=(difference_type __n) _NOEXCEPT
{
_LIBCPP_DEBUG_ASSERT(__get_const_db()->__addable(this, __n),
"Attempted to add/subtract an iterator outside its valid range");
__i += __n;
return *this;
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 __wrap_iter operator- (difference_type __n) const _NOEXCEPT
{return *this + (-__n);}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 __wrap_iter& operator-=(difference_type __n) _NOEXCEPT
{*this += -__n; return *this;}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 reference operator[](difference_type __n) const _NOEXCEPT
{
_LIBCPP_DEBUG_ASSERT(__get_const_db()->__subscriptable(this, __n),
"Attempted to subscript an iterator outside its valid range");
return __i[__n];
}
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11 iterator_type base() const _NOEXCEPT {return __i;}
private:
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
explicit __wrap_iter(const void* __p, iterator_type __x) _NOEXCEPT : __i(__x)
{
(void)__p;
#ifdef _LIBCPP_ENABLE_DEBUG_MODE
if (!__libcpp_is_constant_evaluated())
__get_db()->__insert_ic(this, __p);
#endif
}
template <class _Up> friend class __wrap_iter;
template <class _CharT, class _Traits, class _Alloc> friend class basic_string;
template <class _Tp, class _Alloc> friend class _LIBCPP_TEMPLATE_VIS vector;
template <class _Tp, size_t> friend class _LIBCPP_TEMPLATE_VIS span;
};
template <class _Iter1>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
bool operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
{
return __x.base() == __y.base();
}
template <class _Iter1, class _Iter2>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
bool operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
{
return __x.base() == __y.base();
}
template <class _Iter1>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
bool operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
{
_LIBCPP_DEBUG_ASSERT(__get_const_db()->__less_than_comparable(_VSTD::addressof(__x), _VSTD::addressof(__y)),
"Attempted to compare incomparable iterators");
return __x.base() < __y.base();
}
template <class _Iter1, class _Iter2>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
bool operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
{
_LIBCPP_DEBUG_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
"Attempted to compare incomparable iterators");
return __x.base() < __y.base();
}
template <class _Iter1>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
bool operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
{
return !(__x == __y);
}
template <class _Iter1, class _Iter2>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
bool operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
{
return !(__x == __y);
}
template <class _Iter1>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
bool operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
{
return __y < __x;
}
template <class _Iter1, class _Iter2>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
bool operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
{
return __y < __x;
}
template <class _Iter1>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
bool operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
{
return !(__x < __y);
}
template <class _Iter1, class _Iter2>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
bool operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
{
return !(__x < __y);
}
template <class _Iter1>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
bool operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
{
return !(__y < __x);
}
template <class _Iter1, class _Iter2>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
bool operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
{
return !(__y < __x);
}
template <class _Iter1, class _Iter2>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
#ifndef _LIBCPP_CXX03_LANG
auto operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
-> decltype(__x.base() - __y.base())
#else
typename __wrap_iter<_Iter1>::difference_type
operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
#endif // C++03
{
_LIBCPP_DEBUG_ASSERT(__get_const_db()->__less_than_comparable(_VSTD::addressof(__x), _VSTD::addressof(__y)),
"Attempted to subtract incompatible iterators");
return __x.base() - __y.base();
}
template <class _Iter1>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
__wrap_iter<_Iter1> operator+(typename __wrap_iter<_Iter1>::difference_type __n, __wrap_iter<_Iter1> __x) _NOEXCEPT
{
__x += __n;
return __x;
}
#if _LIBCPP_STD_VER <= 17
template <class _It>
struct __is_cpp17_contiguous_iterator<__wrap_iter<_It> > : true_type {};
#endif
template <class _It>
struct _LIBCPP_TEMPLATE_VIS pointer_traits<__wrap_iter<_It> >
{
typedef __wrap_iter<_It> pointer;
typedef typename pointer_traits<_It>::element_type element_type;
typedef typename pointer_traits<_It>::difference_type difference_type;
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR
static element_type *to_address(pointer __w) _NOEXCEPT {
return _VSTD::__to_address(__w.base());
}
};
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ITERATOR_WRAP_ITER_H
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