// Streambuf iterators
-// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
-// 2006, 2007, 2009, 2010, 2011
-// Free Software Foundation, Inc.
+// Copyright (C) 1997-2023 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
#pragma GCC system_header
#include <streambuf>
+#include <bits/stl_iterator_base_types.h>
#include <debug/debug.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
-
+
/**
* @addtogroup iterators
* @{
*/
+// Ignore warnings about std::iterator.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
// 24.5.3 Template class istreambuf_iterator
/// Provides input iterator semantics for streambufs.
template<typename _CharT, typename _Traits>
class istreambuf_iterator
: public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
- _CharT*, _CharT&>
+ _CharT*, _CharT>
{
public:
// Types:
- //@{
+ ///@{
/// Public typedefs
+#if __cplusplus < 201103L
+ typedef _CharT& reference; // Changed to _CharT by LWG 445
+#elif __cplusplus > 201703L
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 3188. istreambuf_iterator::pointer should not be unspecified
+ using pointer = void;
+#endif
+
typedef _CharT char_type;
typedef _Traits traits_type;
typedef typename _Traits::int_type int_type;
typedef basic_streambuf<_CharT, _Traits> streambuf_type;
typedef basic_istream<_CharT, _Traits> istream_type;
- //@}
+ ///@}
template<typename _CharT2>
friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
- ostreambuf_iterator<_CharT2> >::__type
+ ostreambuf_iterator<_CharT2> >::__type
copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
ostreambuf_iterator<_CharT2>);
template<bool _IsMove, typename _CharT2>
- friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
+ friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
_CharT2*>::__type
__copy_move_a2(istreambuf_iterator<_CharT2>,
istreambuf_iterator<_CharT2>, _CharT2*);
+ template<typename _CharT2, typename _Size>
+ friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
+ _CharT2*>::__type
+ __copy_n_a(istreambuf_iterator<_CharT2>, _Size, _CharT2*, bool);
+
template<typename _CharT2>
friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
- istreambuf_iterator<_CharT2> >::__type
+ istreambuf_iterator<_CharT2> >::__type
find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
const _CharT2&);
+ template<typename _CharT2, typename _Distance>
+ friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
+ void>::__type
+ advance(istreambuf_iterator<_CharT2>&, _Distance);
+
private:
// 24.5.3 istreambuf_iterator
// p 1
// NB: This implementation assumes the "end of stream" value
// is EOF, or -1.
mutable streambuf_type* _M_sbuf;
- mutable int_type _M_c;
+ int_type _M_c;
public:
/// Construct end of input stream iterator.
_GLIBCXX_CONSTEXPR istreambuf_iterator() _GLIBCXX_USE_NOEXCEPT
: _M_sbuf(0), _M_c(traits_type::eof()) { }
-#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#if __cplusplus > 201703L && __cpp_lib_concepts
+ constexpr istreambuf_iterator(default_sentinel_t) noexcept
+ : istreambuf_iterator() { }
+#endif
+
+#if __cplusplus >= 201103L
istreambuf_iterator(const istreambuf_iterator&) noexcept = default;
~istreambuf_iterator() = default;
istreambuf_iterator(streambuf_type* __s) _GLIBCXX_USE_NOEXCEPT
: _M_sbuf(__s), _M_c(traits_type::eof()) { }
+#if __cplusplus >= 201103L
+ istreambuf_iterator&
+ operator=(const istreambuf_iterator&) noexcept = default;
+#endif
+
/// Return the current character pointed to by iterator. This returns
/// streambuf.sgetc(). It cannot be assigned. NB: The result of
/// operator*() on an end of stream is undefined.
+ _GLIBCXX_NODISCARD
char_type
operator*() const
{
+ int_type __c = _M_get();
+
#ifdef _GLIBCXX_DEBUG_PEDANTIC
// Dereferencing a past-the-end istreambuf_iterator is a
// libstdc++ extension
- __glibcxx_requires_cond(!_M_at_eof(),
+ __glibcxx_requires_cond(!_S_is_eof(__c),
_M_message(__gnu_debug::__msg_deref_istreambuf)
._M_iterator(*this));
#endif
- return traits_type::to_char_type(_M_get());
+ return traits_type::to_char_type(__c);
}
/// Advance the iterator. Calls streambuf.sbumpc().
istreambuf_iterator&
operator++()
{
- __glibcxx_requires_cond(!_M_at_eof(),
+ __glibcxx_requires_cond(_M_sbuf &&
+ (!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())),
_M_message(__gnu_debug::__msg_inc_istreambuf)
._M_iterator(*this));
- if (_M_sbuf)
- {
- _M_sbuf->sbumpc();
- _M_c = traits_type::eof();
- }
+
+ _M_sbuf->sbumpc();
+ _M_c = traits_type::eof();
return *this;
}
istreambuf_iterator
operator++(int)
{
- __glibcxx_requires_cond(!_M_at_eof(),
+ __glibcxx_requires_cond(_M_sbuf &&
+ (!_S_is_eof(_M_c) || !_S_is_eof(_M_sbuf->sgetc())),
_M_message(__gnu_debug::__msg_inc_istreambuf)
._M_iterator(*this));
istreambuf_iterator __old = *this;
- if (_M_sbuf)
- {
- __old._M_c = _M_sbuf->sbumpc();
- _M_c = traits_type::eof();
- }
+ __old._M_c = _M_sbuf->sbumpc();
+ _M_c = traits_type::eof();
return __old;
}
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 110 istreambuf_iterator::equal not const
- // NB: there is also number 111 (NAD, Future) pending on this function.
+ // NB: there is also number 111 (NAD) relevant to this function.
/// Return true both iterators are end or both are not end.
+ _GLIBCXX_NODISCARD
bool
equal(const istreambuf_iterator& __b) const
{ return _M_at_eof() == __b._M_at_eof(); }
int_type
_M_get() const
{
- const int_type __eof = traits_type::eof();
- int_type __ret = __eof;
- if (_M_sbuf)
- {
- if (!traits_type::eq_int_type(_M_c, __eof))
- __ret = _M_c;
- else if (!traits_type::eq_int_type((__ret = _M_sbuf->sgetc()),
- __eof))
- _M_c = __ret;
- else
- _M_sbuf = 0;
- }
+ int_type __ret = _M_c;
+ if (_M_sbuf && _S_is_eof(__ret) && _S_is_eof(__ret = _M_sbuf->sgetc()))
+ _M_sbuf = 0;
return __ret;
}
bool
_M_at_eof() const
+ { return _S_is_eof(_M_get()); }
+
+ static bool
+ _S_is_eof(int_type __c)
{
const int_type __eof = traits_type::eof();
- return traits_type::eq_int_type(_M_get(), __eof);
+ return traits_type::eq_int_type(__c, __eof);
}
+
+#if __cplusplus > 201703L && __cpp_lib_concepts
+ [[nodiscard]]
+ friend bool
+ operator==(const istreambuf_iterator& __i, default_sentinel_t __s)
+ { return __i._M_at_eof(); }
+#endif
};
template<typename _CharT, typename _Traits>
+ _GLIBCXX_NODISCARD
inline bool
operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
const istreambuf_iterator<_CharT, _Traits>& __b)
{ return __a.equal(__b); }
+#if __cpp_impl_three_way_comparison < 201907L
template<typename _CharT, typename _Traits>
+ _GLIBCXX_NODISCARD
inline bool
operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
const istreambuf_iterator<_CharT, _Traits>& __b)
{ return !__a.equal(__b); }
+#endif
/// Provides output iterator semantics for streambufs.
template<typename _CharT, typename _Traits>
{
public:
// Types:
- //@{
+ ///@{
/// Public typedefs
- typedef _CharT char_type;
- typedef _Traits traits_type;
+#if __cplusplus > 201703L
+ using difference_type = ptrdiff_t;
+#endif
+ typedef _CharT char_type;
+ typedef _Traits traits_type;
typedef basic_streambuf<_CharT, _Traits> streambuf_type;
typedef basic_ostream<_CharT, _Traits> ostream_type;
- //@}
+ ///@}
template<typename _CharT2>
friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
- ostreambuf_iterator<_CharT2> >::__type
+ ostreambuf_iterator<_CharT2> >::__type
copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
ostreambuf_iterator<_CharT2>);
bool _M_failed;
public:
+
+#if __cplusplus > 201703L
+ constexpr
+ ostreambuf_iterator() noexcept
+ : _M_sbuf(nullptr), _M_failed(true) { }
+#endif
+
/// Construct output iterator from ostream.
ostreambuf_iterator(ostream_type& __s) _GLIBCXX_USE_NOEXCEPT
: _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }
}
/// Return *this.
+ _GLIBCXX_NODISCARD
ostreambuf_iterator&
operator*()
{ return *this; }
{ return *this; }
/// Return true if previous operator=() failed.
+ _GLIBCXX_NODISCARD
bool
failed() const _GLIBCXX_USE_NOEXCEPT
{ return _M_failed; }
return *this;
}
};
+#pragma GCC diagnostic pop
// Overloads for streambuf iterators.
template<typename _CharT>
typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
- ostreambuf_iterator<_CharT> >::__type
+ ostreambuf_iterator<_CharT> >::__type
copy(istreambuf_iterator<_CharT> __first,
istreambuf_iterator<_CharT> __last,
ostreambuf_iterator<_CharT> __result)
}
template<bool _IsMove, typename _CharT>
- typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
- ostreambuf_iterator<_CharT> >::__type
+ typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
+ ostreambuf_iterator<_CharT> >::__type
__copy_move_a2(_CharT* __first, _CharT* __last,
ostreambuf_iterator<_CharT> __result)
{
}
template<bool _IsMove, typename _CharT>
- typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
- _CharT*>::__type
+ typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
+ _CharT*>::__type
__copy_move_a2(istreambuf_iterator<_CharT> __first,
istreambuf_iterator<_CharT> __last, _CharT* __result)
{
- typedef istreambuf_iterator<_CharT> __is_iterator_type;
- typedef typename __is_iterator_type::traits_type traits_type;
+ typedef istreambuf_iterator<_CharT> __is_iterator_type;
+ typedef typename __is_iterator_type::traits_type traits_type;
typedef typename __is_iterator_type::streambuf_type streambuf_type;
- typedef typename traits_type::int_type int_type;
+ typedef typename traits_type::int_type int_type;
if (__first._M_sbuf && !__last._M_sbuf)
{
return __result;
}
+ template<typename _CharT, typename _Size>
+ typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
+ _CharT*>::__type
+ __copy_n_a(istreambuf_iterator<_CharT> __it, _Size __n, _CharT* __result,
+ bool __strict __attribute__((__unused__)))
+ {
+ if (__n == 0)
+ return __result;
+
+ __glibcxx_requires_cond(__it._M_sbuf,
+ _M_message(__gnu_debug::__msg_inc_istreambuf)
+ ._M_iterator(__it));
+ _CharT* __beg = __result;
+ __result += __it._M_sbuf->sgetn(__beg, __n);
+ __glibcxx_requires_cond(!__strict || __result - __beg == __n,
+ _M_message(__gnu_debug::__msg_inc_istreambuf)
+ ._M_iterator(__it));
+ return __result;
+ }
+
template<typename _CharT>
typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
istreambuf_iterator<_CharT> >::__type
find(istreambuf_iterator<_CharT> __first,
istreambuf_iterator<_CharT> __last, const _CharT& __val)
{
- typedef istreambuf_iterator<_CharT> __is_iterator_type;
+ typedef istreambuf_iterator<_CharT> __is_iterator_type;
typedef typename __is_iterator_type::traits_type traits_type;
typedef typename __is_iterator_type::streambuf_type streambuf_type;
- typedef typename traits_type::int_type int_type;
+ typedef typename traits_type::int_type int_type;
+ const int_type __eof = traits_type::eof();
if (__first._M_sbuf && !__last._M_sbuf)
{
const int_type __ival = traits_type::to_int_type(__val);
streambuf_type* __sb = __first._M_sbuf;
int_type __c = __sb->sgetc();
- while (!traits_type::eq_int_type(__c, traits_type::eof())
+ while (!traits_type::eq_int_type(__c, __eof)
&& !traits_type::eq_int_type(__c, __ival))
{
streamsize __n = __sb->egptr() - __sb->gptr();
__c = __sb->snextc();
}
- if (!traits_type::eq_int_type(__c, traits_type::eof()))
- __first._M_c = __c;
- else
- __first._M_sbuf = 0;
+ __first._M_c = __eof;
}
+
return __first;
}
-// @} group iterators
+ template<typename _CharT, typename _Distance>
+ typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
+ void>::__type
+ advance(istreambuf_iterator<_CharT>& __i, _Distance __n)
+ {
+ if (__n == 0)
+ return;
+
+ __glibcxx_assert(__n > 0);
+ __glibcxx_requires_cond(!__i._M_at_eof(),
+ _M_message(__gnu_debug::__msg_inc_istreambuf)
+ ._M_iterator(__i));
+
+ typedef istreambuf_iterator<_CharT> __is_iterator_type;
+ typedef typename __is_iterator_type::traits_type traits_type;
+ typedef typename __is_iterator_type::streambuf_type streambuf_type;
+ typedef typename traits_type::int_type int_type;
+ const int_type __eof = traits_type::eof();
+
+ streambuf_type* __sb = __i._M_sbuf;
+ while (__n > 0)
+ {
+ streamsize __size = __sb->egptr() - __sb->gptr();
+ if (__size > __n)
+ {
+ __sb->__safe_gbump(__n);
+ break;
+ }
+
+ __sb->__safe_gbump(__size);
+ __n -= __size;
+ if (traits_type::eq_int_type(__sb->underflow(), __eof))
+ {
+ __glibcxx_requires_cond(__n == 0,
+ _M_message(__gnu_debug::__msg_inc_istreambuf)
+ ._M_iterator(__i));
+ break;
+ }
+ }
+
+ __i._M_c = __eof;
+ }
+
+/// @} group iterators
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
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