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llvm-project/libcxx/include/istream
Nikolas Klauser b9a2658a3e
[libc++][C++03] Use __cxx03/ headers in C++03 mode (#109002) 
This patch implements the forwarding to frozen C++03 headers as
discussed in
https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc. In the
RFC, we initially proposed selecting the right headers from the Clang
driver, however consensus seemed to steer towards handling this in the
library itself. This patch implements that direction.

At a high level, the changes basically amount to making each public
header look like this:

```
// inside <vector>
#ifdef _LIBCPP_CXX03_LANG
#  include <__cxx03/vector>
#else
  // normal <vector> content
#endif
```

In most cases, public headers are simple umbrella headers so there isn't
much code in the #else branch. In other cases, the #else branch contains
the actual implementation of the header.
2024-12-21 13:01:48 +01:00

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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_ISTREAM
#define _LIBCPP_ISTREAM
/*
istream synopsis
template <class charT, class traits = char_traits<charT> >
class basic_istream
: virtual public basic_ios<charT,traits>
{
public:
// types (inherited from basic_ios (27.5.4)):
typedef charT char_type;
typedef traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// 27.7.1.1.1 Constructor/destructor:
explicit basic_istream(basic_streambuf<char_type, traits_type>* sb);
basic_istream(basic_istream&& rhs);
virtual ~basic_istream();
// 27.7.1.1.2 Assign/swap:
basic_istream& operator=(basic_istream&& rhs);
void swap(basic_istream& rhs);
// 27.7.1.1.3 Prefix/suffix:
class sentry;
// 27.7.1.2 Formatted input:
basic_istream& operator>>(basic_istream& (*pf)(basic_istream&));
basic_istream& operator>>(basic_ios<char_type, traits_type>&
(*pf)(basic_ios<char_type, traits_type>&));
basic_istream& operator>>(ios_base& (*pf)(ios_base&));
basic_istream& operator>>(basic_streambuf<char_type, traits_type>* sb);
basic_istream& operator>>(bool& n);
basic_istream& operator>>(short& n);
basic_istream& operator>>(unsigned short& n);
basic_istream& operator>>(int& n);
basic_istream& operator>>(unsigned int& n);
basic_istream& operator>>(long& n);
basic_istream& operator>>(unsigned long& n);
basic_istream& operator>>(long long& n);
basic_istream& operator>>(unsigned long long& n);
basic_istream& operator>>(float& f);
basic_istream& operator>>(double& f);
basic_istream& operator>>(long double& f);
basic_istream& operator>>(void*& p);
// 27.7.1.3 Unformatted input:
streamsize gcount() const;
int_type get();
basic_istream& get(char_type& c);
basic_istream& get(char_type* s, streamsize n);
basic_istream& get(char_type* s, streamsize n, char_type delim);
basic_istream& get(basic_streambuf<char_type,traits_type>& sb);
basic_istream& get(basic_streambuf<char_type,traits_type>& sb, char_type delim);
basic_istream& getline(char_type* s, streamsize n);
basic_istream& getline(char_type* s, streamsize n, char_type delim);
basic_istream& ignore(streamsize n = 1, int_type delim = traits_type::eof());
int_type peek();
basic_istream& read (char_type* s, streamsize n);
streamsize readsome(char_type* s, streamsize n);
basic_istream& putback(char_type c);
basic_istream& unget();
int sync();
pos_type tellg();
basic_istream& seekg(pos_type);
basic_istream& seekg(off_type, ios_base::seekdir);
protected:
basic_istream(const basic_istream& rhs) = delete;
basic_istream(basic_istream&& rhs);
// 27.7.2.1.2 Assign/swap:
basic_istream& operator=(const basic_istream& rhs) = delete;
basic_istream& operator=(basic_istream&& rhs);
void swap(basic_istream& rhs);
};
// 27.7.1.2.3 character extraction templates:
template<class charT, class traits>
basic_istream<charT,traits>& operator>>(basic_istream<charT,traits>&, charT&);
template<class traits>
basic_istream<char,traits>& operator>>(basic_istream<char,traits>&, unsigned char&);
template<class traits>
basic_istream<char,traits>& operator>>(basic_istream<char,traits>&, signed char&);
template<class charT, class traits>
basic_istream<charT,traits>& operator>>(basic_istream<charT,traits>&, charT*);
template<class traits>
basic_istream<char,traits>& operator>>(basic_istream<char,traits>&, unsigned char*);
template<class traits>
basic_istream<char,traits>& operator>>(basic_istream<char,traits>&, signed char*);
template <class charT, class traits>
void
swap(basic_istream<charT, traits>& x, basic_istream<charT, traits>& y);
typedef basic_istream<char> istream;
typedef basic_istream<wchar_t> wistream;
template <class charT, class traits = char_traits<charT> >
class basic_iostream :
public basic_istream<charT,traits>,
public basic_ostream<charT,traits>
{
public:
// types:
typedef charT char_type;
typedef traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// constructor/destructor
explicit basic_iostream(basic_streambuf<char_type, traits_type>* sb);
basic_iostream(basic_iostream&& rhs);
virtual ~basic_iostream();
// assign/swap
basic_iostream& operator=(basic_iostream&& rhs);
void swap(basic_iostream& rhs);
};
template <class charT, class traits>
void
swap(basic_iostream<charT, traits>& x, basic_iostream<charT, traits>& y);
typedef basic_iostream<char> iostream;
typedef basic_iostream<wchar_t> wiostream;
template <class charT, class traits>
basic_istream<charT,traits>&
ws(basic_istream<charT,traits>& is);
// rvalue stream extraction
template <class Stream, class T>
Stream&& operator>>(Stream&& is, T&& x);
} // std
*/
#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
# include <__cxx03/istream>
#else
# include <__config>
# if _LIBCPP_HAS_LOCALIZATION
# include <__fwd/istream.h>
# include <__iterator/istreambuf_iterator.h>
# include <__ostream/basic_ostream.h>
# include <__type_traits/conjunction.h>
# include <__type_traits/enable_if.h>
# include <__type_traits/is_base_of.h>
# include <__type_traits/make_unsigned.h>
# include <__utility/declval.h>
# include <__utility/forward.h>
# include <bitset>
# include <ios>
# include <locale>
# include <version>
# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
# endif
_LIBCPP_PUSH_MACROS
# include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _CharT, class _Traits>
class _LIBCPP_TEMPLATE_VIS basic_istream : virtual public basic_ios<_CharT, _Traits> {
streamsize __gc_;
_LIBCPP_HIDE_FROM_ABI void __inc_gcount() {
if (__gc_ < numeric_limits<streamsize>::max())
++__gc_;
}
public:
// types (inherited from basic_ios (27.5.4)):
typedef _CharT char_type;
typedef _Traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// 27.7.1.1.1 Constructor/destructor:
inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 explicit basic_istream(basic_streambuf<char_type, traits_type>* __sb)
: __gc_(0) {
this->init(__sb);
}
~basic_istream() override;
protected:
inline _LIBCPP_HIDE_FROM_ABI basic_istream(basic_istream&& __rhs);
// 27.7.1.1.2 Assign/swap:
inline _LIBCPP_HIDE_FROM_ABI basic_istream& operator=(basic_istream&& __rhs);
inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 void swap(basic_istream& __rhs) {
std::swap(__gc_, __rhs.__gc_);
basic_ios<char_type, traits_type>::swap(__rhs);
}
public:
basic_istream(const basic_istream& __rhs) = delete;
basic_istream& operator=(const basic_istream& __rhs) = delete;
// 27.7.1.1.3 Prefix/suffix:
class _LIBCPP_TEMPLATE_VIS sentry;
// 27.7.1.2 Formatted input:
inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 basic_istream& operator>>(basic_istream& (*__pf)(basic_istream&)) {
return __pf(*this);
}
inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 basic_istream&
operator>>(basic_ios<char_type, traits_type>& (*__pf)(basic_ios<char_type, traits_type>&)) {
__pf(*this);
return *this;
}
inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 basic_istream& operator>>(ios_base& (*__pf)(ios_base&)) {
__pf(*this);
return *this;
}
basic_istream& operator>>(basic_streambuf<char_type, traits_type>* __sb);
basic_istream& operator>>(bool& __n);
basic_istream& operator>>(short& __n);
basic_istream& operator>>(unsigned short& __n);
basic_istream& operator>>(int& __n);
basic_istream& operator>>(unsigned int& __n);
basic_istream& operator>>(long& __n);
basic_istream& operator>>(unsigned long& __n);
basic_istream& operator>>(long long& __n);
basic_istream& operator>>(unsigned long long& __n);
basic_istream& operator>>(float& __f);
basic_istream& operator>>(double& __f);
basic_istream& operator>>(long double& __f);
basic_istream& operator>>(void*& __p);
// 27.7.1.3 Unformatted input:
_LIBCPP_HIDE_FROM_ABI streamsize gcount() const { return __gc_; }
int_type get();
inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 basic_istream& get(char_type& __c) {
int_type __ch = get();
if (__ch != traits_type::eof())
__c = traits_type::to_char_type(__ch);
return *this;
}
inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 basic_istream& get(char_type* __s, streamsize __n) {
return get(__s, __n, this->widen('\n'));
}
basic_istream& get(char_type* __s, streamsize __n, char_type __dlm);
inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 basic_istream& get(basic_streambuf<char_type, traits_type>& __sb) {
return get(__sb, this->widen('\n'));
}
basic_istream& get(basic_streambuf<char_type, traits_type>& __sb, char_type __dlm);
inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 basic_istream& getline(char_type* __s, streamsize __n) {
return getline(__s, __n, this->widen('\n'));
}
basic_istream& getline(char_type* __s, streamsize __n, char_type __dlm);
basic_istream& ignore(streamsize __n = 1, int_type __dlm = traits_type::eof());
int_type peek();
basic_istream& read(char_type* __s, streamsize __n);
streamsize readsome(char_type* __s, streamsize __n);
basic_istream& putback(char_type __c);
basic_istream& unget();
int sync();
pos_type tellg();
basic_istream& seekg(pos_type __pos);
basic_istream& seekg(off_type __off, ios_base::seekdir __dir);
};
template <class _CharT, class _Traits>
class _LIBCPP_TEMPLATE_VIS basic_istream<_CharT, _Traits>::sentry {
bool __ok_;
public:
explicit sentry(basic_istream<_CharT, _Traits>& __is, bool __noskipws = false);
// ~sentry() = default;
_LIBCPP_HIDE_FROM_ABI explicit operator bool() const { return __ok_; }
sentry(const sentry&) = delete;
sentry& operator=(const sentry&) = delete;
};
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>::sentry::sentry(basic_istream<_CharT, _Traits>& __is, bool __noskipws) : __ok_(false) {
if (__is.good()) {
if (__is.tie())
__is.tie()->flush();
if (!__noskipws && (__is.flags() & ios_base::skipws)) {
typedef istreambuf_iterator<_CharT, _Traits> _Ip;
const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
_Ip __i(__is);
_Ip __eof;
for (; __i != __eof; ++__i)
if (!__ct.is(__ct.space, *__i))
break;
if (__i == __eof)
__is.setstate(ios_base::failbit | ios_base::eofbit);
}
__ok_ = __is.good();
} else
__is.setstate(ios_base::failbit);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>::basic_istream(basic_istream&& __rhs) : __gc_(__rhs.__gc_) {
__rhs.__gc_ = 0;
this->move(__rhs);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator=(basic_istream&& __rhs) {
swap(__rhs);
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>::~basic_istream() {}
template <class _Tp, class _CharT, class _Traits>
_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
__input_arithmetic(basic_istream<_CharT, _Traits>& __is, _Tp& __n) {
ios_base::iostate __state = ios_base::goodbit;
typename basic_istream<_CharT, _Traits>::sentry __s(__is);
if (__s) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
typedef istreambuf_iterator<_CharT, _Traits> _Ip;
typedef num_get<_CharT, _Ip> _Fp;
std::use_facet<_Fp>(__is.getloc()).get(_Ip(__is), _Ip(), __is, __state, __n);
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
__is.__setstate_nothrow(__state);
if (__is.exceptions() & ios_base::badbit) {
throw;
}
}
# endif
__is.setstate(__state);
}
return __is;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(unsigned short& __n) {
return std::__input_arithmetic<unsigned short>(*this, __n);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(unsigned int& __n) {
return std::__input_arithmetic<unsigned int>(*this, __n);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(long& __n) {
return std::__input_arithmetic<long>(*this, __n);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(unsigned long& __n) {
return std::__input_arithmetic<unsigned long>(*this, __n);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(long long& __n) {
return std::__input_arithmetic<long long>(*this, __n);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(unsigned long long& __n) {
return std::__input_arithmetic<unsigned long long>(*this, __n);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(float& __n) {
return std::__input_arithmetic<float>(*this, __n);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(double& __n) {
return std::__input_arithmetic<double>(*this, __n);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(long double& __n) {
return std::__input_arithmetic<long double>(*this, __n);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(bool& __n) {
return std::__input_arithmetic<bool>(*this, __n);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(void*& __n) {
return std::__input_arithmetic<void*>(*this, __n);
}
template <class _Tp, class _CharT, class _Traits>
_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
__input_arithmetic_with_numeric_limits(basic_istream<_CharT, _Traits>& __is, _Tp& __n) {
ios_base::iostate __state = ios_base::goodbit;
typename basic_istream<_CharT, _Traits>::sentry __s(__is);
if (__s) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
typedef istreambuf_iterator<_CharT, _Traits> _Ip;
typedef num_get<_CharT, _Ip> _Fp;
long __temp;
std::use_facet<_Fp>(__is.getloc()).get(_Ip(__is), _Ip(), __is, __state, __temp);
if (__temp < numeric_limits<_Tp>::min()) {
__state |= ios_base::failbit;
__n = numeric_limits<_Tp>::min();
} else if (__temp > numeric_limits<_Tp>::max()) {
__state |= ios_base::failbit;
__n = numeric_limits<_Tp>::max();
} else {
__n = static_cast<_Tp>(__temp);
}
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
__is.__setstate_nothrow(__state);
if (__is.exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
__is.setstate(__state);
}
return __is;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(short& __n) {
return std::__input_arithmetic_with_numeric_limits<short>(*this, __n);
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::operator>>(int& __n) {
return std::__input_arithmetic_with_numeric_limits<int>(*this, __n);
}
template <class _CharT, class _Traits>
_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
__input_c_string(basic_istream<_CharT, _Traits>& __is, _CharT* __p, size_t __n) {
ios_base::iostate __state = ios_base::goodbit;
typename basic_istream<_CharT, _Traits>::sentry __sen(__is);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif
_CharT* __s = __p;
const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
while (__s != __p + (__n - 1)) {
typename _Traits::int_type __i = __is.rdbuf()->sgetc();
if (_Traits::eq_int_type(__i, _Traits::eof())) {
__state |= ios_base::eofbit;
break;
}
_CharT __ch = _Traits::to_char_type(__i);
if (__ct.is(__ct.space, __ch))
break;
*__s++ = __ch;
__is.rdbuf()->sbumpc();
}
*__s = _CharT();
__is.width(0);
if (__s == __p)
__state |= ios_base::failbit;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
__is.__setstate_nothrow(__state);
if (__is.exceptions() & ios_base::badbit) {
throw;
}
}
# endif
__is.setstate(__state);
}
return __is;
}
# if _LIBCPP_STD_VER >= 20
template <class _CharT, class _Traits, size_t _Np>
inline _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __is, _CharT (&__buf)[_Np]) {
size_t __n = _Np;
if (__is.width() > 0)
__n = std::min(size_t(__is.width()), _Np);
return std::__input_c_string(__is, __buf, __n);
}
template <class _Traits, size_t _Np>
inline _LIBCPP_HIDE_FROM_ABI basic_istream<char, _Traits>&
operator>>(basic_istream<char, _Traits>& __is, unsigned char (&__buf)[_Np]) {
return __is >> (char(&)[_Np])__buf;
}
template <class _Traits, size_t _Np>
inline _LIBCPP_HIDE_FROM_ABI basic_istream<char, _Traits>&
operator>>(basic_istream<char, _Traits>& __is, signed char (&__buf)[_Np]) {
return __is >> (char(&)[_Np])__buf;
}
# else
template <class _CharT, class _Traits>
inline _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __is, _CharT* __s) {
streamsize __n = __is.width();
if (__n <= 0)
__n = numeric_limits<streamsize>::max() / sizeof(_CharT) - 1;
return std::__input_c_string(__is, __s, size_t(__n));
}
template <class _Traits>
inline _LIBCPP_HIDE_FROM_ABI basic_istream<char, _Traits>&
operator>>(basic_istream<char, _Traits>& __is, unsigned char* __s) {
return __is >> (char*)__s;
}
template <class _Traits>
inline _LIBCPP_HIDE_FROM_ABI basic_istream<char, _Traits>&
operator>>(basic_istream<char, _Traits>& __is, signed char* __s) {
return __is >> (char*)__s;
}
# endif // _LIBCPP_STD_VER >= 20
template <class _CharT, class _Traits>
_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>& operator>>(basic_istream<_CharT, _Traits>& __is, _CharT& __c) {
ios_base::iostate __state = ios_base::goodbit;
typename basic_istream<_CharT, _Traits>::sentry __sen(__is);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif
typename _Traits::int_type __i = __is.rdbuf()->sbumpc();
if (_Traits::eq_int_type(__i, _Traits::eof()))
__state |= ios_base::eofbit | ios_base::failbit;
else
__c = _Traits::to_char_type(__i);
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
__is.__setstate_nothrow(__state);
if (__is.exceptions() & ios_base::badbit) {
throw;
}
}
# endif
__is.setstate(__state);
}
return __is;
}
template <class _Traits>
inline _LIBCPP_HIDE_FROM_ABI basic_istream<char, _Traits>&
operator>>(basic_istream<char, _Traits>& __is, unsigned char& __c) {
return __is >> (char&)__c;
}
template <class _Traits>
inline _LIBCPP_HIDE_FROM_ABI basic_istream<char, _Traits>&
operator>>(basic_istream<char, _Traits>& __is, signed char& __c) {
return __is >> (char&)__c;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::operator>>(basic_streambuf<char_type, traits_type>* __sb) {
ios_base::iostate __state = ios_base::goodbit;
__gc_ = 0;
sentry __s(*this, true);
if (__s) {
if (__sb) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
while (true) {
typename traits_type::int_type __i = this->rdbuf()->sgetc();
if (traits_type::eq_int_type(__i, _Traits::eof())) {
__state |= ios_base::eofbit;
break;
}
if (traits_type::eq_int_type(__sb->sputc(traits_type::to_char_type(__i)), traits_type::eof()))
break;
__inc_gcount();
this->rdbuf()->sbumpc();
}
if (__gc_ == 0)
__state |= ios_base::failbit;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
if (__gc_ == 0)
__state |= ios_base::failbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::failbit || this->exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
} else {
__state |= ios_base::failbit;
}
this->setstate(__state);
}
return *this;
}
template <class _CharT, class _Traits>
typename basic_istream<_CharT, _Traits>::int_type basic_istream<_CharT, _Traits>::get() {
ios_base::iostate __state = ios_base::goodbit;
__gc_ = 0;
int_type __r = traits_type::eof();
sentry __s(*this, true);
if (__s) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif
__r = this->rdbuf()->sbumpc();
if (traits_type::eq_int_type(__r, traits_type::eof()))
__state |= ios_base::failbit | ios_base::eofbit;
else
__gc_ = 1;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
this->__setstate_nothrow(this->rdstate() | ios_base::badbit);
if (this->exceptions() & ios_base::badbit) {
throw;
}
}
# endif
this->setstate(__state);
}
return __r;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::get(char_type* __s, streamsize __n, char_type __dlm) {
ios_base::iostate __state = ios_base::goodbit;
__gc_ = 0;
sentry __sen(*this, true);
if (__sen) {
if (__n > 0) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif
while (__gc_ < __n - 1) {
int_type __i = this->rdbuf()->sgetc();
if (traits_type::eq_int_type(__i, traits_type::eof())) {
__state |= ios_base::eofbit;
break;
}
char_type __ch = traits_type::to_char_type(__i);
if (traits_type::eq(__ch, __dlm))
break;
*__s++ = __ch;
__inc_gcount();
this->rdbuf()->sbumpc();
}
if (__gc_ == 0)
__state |= ios_base::failbit;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::badbit) {
if (__n > 0)
*__s = char_type();
throw;
}
}
# endif
} else {
__state |= ios_base::failbit;
}
if (__n > 0)
*__s = char_type();
this->setstate(__state);
}
if (__n > 0)
*__s = char_type();
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::get(basic_streambuf<char_type, traits_type>& __sb, char_type __dlm) {
ios_base::iostate __state = ios_base::goodbit;
__gc_ = 0;
sentry __sen(*this, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
while (true) {
typename traits_type::int_type __i = this->rdbuf()->sgetc();
if (traits_type::eq_int_type(__i, traits_type::eof())) {
__state |= ios_base::eofbit;
break;
}
char_type __ch = traits_type::to_char_type(__i);
if (traits_type::eq(__ch, __dlm))
break;
if (traits_type::eq_int_type(__sb.sputc(__ch), traits_type::eof()))
break;
__inc_gcount();
this->rdbuf()->sbumpc();
}
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
// according to the spec, exceptions here are caught but not rethrown
}
# endif // _LIBCPP_HAS_EXCEPTIONS
if (__gc_ == 0)
__state |= ios_base::failbit;
this->setstate(__state);
}
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>&
basic_istream<_CharT, _Traits>::getline(char_type* __s, streamsize __n, char_type __dlm) {
ios_base::iostate __state = ios_base::goodbit;
__gc_ = 0;
sentry __sen(*this, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
while (true) {
typename traits_type::int_type __i = this->rdbuf()->sgetc();
if (traits_type::eq_int_type(__i, traits_type::eof())) {
__state |= ios_base::eofbit;
break;
}
char_type __ch = traits_type::to_char_type(__i);
if (traits_type::eq(__ch, __dlm)) {
this->rdbuf()->sbumpc();
__inc_gcount();
break;
}
if (__gc_ >= __n - 1) {
__state |= ios_base::failbit;
break;
}
*__s++ = __ch;
this->rdbuf()->sbumpc();
__inc_gcount();
}
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::badbit) {
if (__n > 0)
*__s = char_type();
if (__gc_ == 0)
__state |= ios_base::failbit;
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
}
if (__n > 0)
*__s = char_type();
if (__gc_ == 0)
__state |= ios_base::failbit;
this->setstate(__state);
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::ignore(streamsize __n, int_type __dlm) {
ios_base::iostate __state = ios_base::goodbit;
__gc_ = 0;
sentry __sen(*this, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
if (__n == numeric_limits<streamsize>::max()) {
while (true) {
typename traits_type::int_type __i = this->rdbuf()->sbumpc();
if (traits_type::eq_int_type(__i, traits_type::eof())) {
__state |= ios_base::eofbit;
break;
}
__inc_gcount();
if (traits_type::eq_int_type(__i, __dlm))
break;
}
} else {
while (__gc_ < __n) {
typename traits_type::int_type __i = this->rdbuf()->sbumpc();
if (traits_type::eq_int_type(__i, traits_type::eof())) {
__state |= ios_base::eofbit;
break;
}
__inc_gcount();
if (traits_type::eq_int_type(__i, __dlm))
break;
}
}
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
this->setstate(__state);
}
return *this;
}
template <class _CharT, class _Traits>
typename basic_istream<_CharT, _Traits>::int_type basic_istream<_CharT, _Traits>::peek() {
ios_base::iostate __state = ios_base::goodbit;
__gc_ = 0;
int_type __r = traits_type::eof();
sentry __sen(*this, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
__r = this->rdbuf()->sgetc();
if (traits_type::eq_int_type(__r, traits_type::eof()))
__state |= ios_base::eofbit;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
this->setstate(__state);
}
return __r;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::read(char_type* __s, streamsize __n) {
ios_base::iostate __state = ios_base::goodbit;
__gc_ = 0;
sentry __sen(*this, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
__gc_ = this->rdbuf()->sgetn(__s, __n);
if (__gc_ != __n)
__state |= ios_base::failbit | ios_base::eofbit;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
} else {
__state |= ios_base::failbit;
}
this->setstate(__state);
return *this;
}
template <class _CharT, class _Traits>
streamsize basic_istream<_CharT, _Traits>::readsome(char_type* __s, streamsize __n) {
ios_base::iostate __state = ios_base::goodbit;
__gc_ = 0;
sentry __sen(*this, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
streamsize __c = this->rdbuf()->in_avail();
switch (__c) {
case -1:
__state |= ios_base::eofbit;
break;
case 0:
break;
default:
__n = std::min(__c, __n);
__gc_ = this->rdbuf()->sgetn(__s, __n);
if (__gc_ != __n)
__state |= ios_base::failbit | ios_base::eofbit;
break;
}
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
} else {
__state |= ios_base::failbit;
}
this->setstate(__state);
return __gc_;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::putback(char_type __c) {
ios_base::iostate __state = this->rdstate() & ~ios_base::eofbit;
__gc_ = 0;
this->clear(__state);
sentry __sen(*this, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
if (this->rdbuf() == nullptr || this->rdbuf()->sputbackc(__c) == traits_type::eof())
__state |= ios_base::badbit;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
} else {
__state |= ios_base::failbit;
}
this->setstate(__state);
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::unget() {
ios_base::iostate __state = this->rdstate() & ~ios_base::eofbit;
__gc_ = 0;
this->clear(__state);
sentry __sen(*this, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
if (this->rdbuf() == nullptr || this->rdbuf()->sungetc() == traits_type::eof())
__state |= ios_base::badbit;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
} else {
__state |= ios_base::failbit;
}
this->setstate(__state);
return *this;
}
template <class _CharT, class _Traits>
int basic_istream<_CharT, _Traits>::sync() {
ios_base::iostate __state = ios_base::goodbit;
sentry __sen(*this, true);
if (this->rdbuf() == nullptr)
return -1;
int __r = 0;
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
if (this->rdbuf()->pubsync() == -1) {
__state |= ios_base::badbit;
__r = -1;
}
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
this->setstate(__state);
}
return __r;
}
template <class _CharT, class _Traits>
typename basic_istream<_CharT, _Traits>::pos_type basic_istream<_CharT, _Traits>::tellg() {
ios_base::iostate __state = ios_base::goodbit;
pos_type __r(-1);
sentry __sen(*this, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
__r = this->rdbuf()->pubseekoff(0, ios_base::cur, ios_base::in);
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
this->setstate(__state);
}
return __r;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::seekg(pos_type __pos) {
ios_base::iostate __state = this->rdstate() & ~ios_base::eofbit;
this->clear(__state);
sentry __sen(*this, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
if (this->rdbuf()->pubseekpos(__pos, ios_base::in) == pos_type(-1))
__state |= ios_base::failbit;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
this->setstate(__state);
}
return *this;
}
template <class _CharT, class _Traits>
basic_istream<_CharT, _Traits>& basic_istream<_CharT, _Traits>::seekg(off_type __off, ios_base::seekdir __dir) {
ios_base::iostate __state = this->rdstate() & ~ios_base::eofbit;
this->clear(__state);
sentry __sen(*this, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
if (this->rdbuf()->pubseekoff(__off, __dir, ios_base::in) == pos_type(-1))
__state |= ios_base::failbit;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
this->__setstate_nothrow(__state);
if (this->exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
this->setstate(__state);
}
return *this;
}
template <class _CharT, class _Traits>
_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>& ws(basic_istream<_CharT, _Traits>& __is) {
ios_base::iostate __state = ios_base::goodbit;
typename basic_istream<_CharT, _Traits>::sentry __sen(__is, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif // _LIBCPP_HAS_EXCEPTIONS
const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
while (true) {
typename _Traits::int_type __i = __is.rdbuf()->sgetc();
if (_Traits::eq_int_type(__i, _Traits::eof())) {
__state |= ios_base::eofbit;
break;
}
if (!__ct.is(__ct.space, _Traits::to_char_type(__i)))
break;
__is.rdbuf()->sbumpc();
}
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
__is.__setstate_nothrow(__state);
if (__is.exceptions() & ios_base::badbit) {
throw;
}
}
# endif // _LIBCPP_HAS_EXCEPTIONS
__is.setstate(__state);
}
return __is;
}
template <class _Stream, class _Tp, class = void>
struct __is_istreamable : false_type {};
template <class _Stream, class _Tp>
struct __is_istreamable<_Stream, _Tp, decltype(std::declval<_Stream>() >> std::declval<_Tp>(), void())> : true_type {};
template <class _Stream,
class _Tp,
__enable_if_t< _And<is_base_of<ios_base, _Stream>, __is_istreamable<_Stream&, _Tp&&> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _Stream&& operator>>(_Stream&& __is, _Tp&& __x) {
__is >> std::forward<_Tp>(__x);
return std::move(__is);
}
template <class _CharT, class _Traits>
class _LIBCPP_TEMPLATE_VIS basic_iostream
: public basic_istream<_CharT, _Traits>,
public basic_ostream<_CharT, _Traits> {
public:
// types:
typedef _CharT char_type;
typedef _Traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// constructor/destructor
inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 explicit basic_iostream(basic_streambuf<char_type, traits_type>* __sb)
: basic_istream<_CharT, _Traits>(__sb) {}
~basic_iostream() override;
protected:
inline _LIBCPP_HIDE_FROM_ABI basic_iostream(basic_iostream&& __rhs);
// assign/swap
inline _LIBCPP_HIDE_FROM_ABI basic_iostream& operator=(basic_iostream&& __rhs);
inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 void swap(basic_iostream& __rhs) {
basic_istream<char_type, traits_type>::swap(__rhs);
}
};
template <class _CharT, class _Traits>
basic_iostream<_CharT, _Traits>::basic_iostream(basic_iostream&& __rhs)
: basic_istream<_CharT, _Traits>(std::move(__rhs)) {}
template <class _CharT, class _Traits>
basic_iostream<_CharT, _Traits>& basic_iostream<_CharT, _Traits>::operator=(basic_iostream&& __rhs) {
swap(__rhs);
return *this;
}
template <class _CharT, class _Traits>
basic_iostream<_CharT, _Traits>::~basic_iostream() {}
template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT, _Traits, _Allocator>& __str) {
ios_base::iostate __state = ios_base::goodbit;
typename basic_istream<_CharT, _Traits>::sentry __sen(__is);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif
__str.clear();
using _Size = typename basic_string<_CharT, _Traits, _Allocator>::size_type;
streamsize const __width = __is.width();
_Size const __max_size = __str.max_size();
_Size __n;
if (__width <= 0) {
__n = __max_size;
} else {
__n = std::__to_unsigned_like(__width) < __max_size ? static_cast<_Size>(__width) : __max_size;
}
_Size __c = 0;
const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
while (__c < __n) {
typename _Traits::int_type __i = __is.rdbuf()->sgetc();
if (_Traits::eq_int_type(__i, _Traits::eof())) {
__state |= ios_base::eofbit;
break;
}
_CharT __ch = _Traits::to_char_type(__i);
if (__ct.is(__ct.space, __ch))
break;
__str.push_back(__ch);
++__c;
__is.rdbuf()->sbumpc();
}
__is.width(0);
if (__c == 0)
__state |= ios_base::failbit;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
__is.__setstate_nothrow(__state);
if (__is.exceptions() & ios_base::badbit) {
throw;
}
}
# endif
__is.setstate(__state);
}
return __is;
}
template <class _CharT, class _Traits, class _Allocator>
_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm) {
ios_base::iostate __state = ios_base::goodbit;
typename basic_istream<_CharT, _Traits>::sentry __sen(__is, true);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif
__str.clear();
streamsize __extr = 0;
while (true) {
typename _Traits::int_type __i = __is.rdbuf()->sbumpc();
if (_Traits::eq_int_type(__i, _Traits::eof())) {
__state |= ios_base::eofbit;
break;
}
++__extr;
_CharT __ch = _Traits::to_char_type(__i);
if (_Traits::eq(__ch, __dlm))
break;
__str.push_back(__ch);
if (__str.size() == __str.max_size()) {
__state |= ios_base::failbit;
break;
}
}
if (__extr == 0)
__state |= ios_base::failbit;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
__is.__setstate_nothrow(__state);
if (__is.exceptions() & ios_base::badbit) {
throw;
}
}
# endif
__is.setstate(__state);
}
return __is;
}
template <class _CharT, class _Traits, class _Allocator>
inline _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT, _Traits, _Allocator>& __str) {
return std::getline(__is, __str, __is.widen('\n'));
}
template <class _CharT, class _Traits, class _Allocator>
inline _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>&& __is, basic_string<_CharT, _Traits, _Allocator>& __str, _CharT __dlm) {
return std::getline(__is, __str, __dlm);
}
template <class _CharT, class _Traits, class _Allocator>
inline _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
getline(basic_istream<_CharT, _Traits>&& __is, basic_string<_CharT, _Traits, _Allocator>& __str) {
return std::getline(__is, __str, __is.widen('\n'));
}
template <class _CharT, class _Traits, size_t _Size>
_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
operator>>(basic_istream<_CharT, _Traits>& __is, bitset<_Size>& __x) {
ios_base::iostate __state = ios_base::goodbit;
typename basic_istream<_CharT, _Traits>::sentry __sen(__is);
if (__sen) {
# if _LIBCPP_HAS_EXCEPTIONS
try {
# endif
basic_string<_CharT, _Traits> __str;
const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
size_t __c = 0;
_CharT __zero = __ct.widen('0');
_CharT __one = __ct.widen('1');
while (__c != _Size) {
typename _Traits::int_type __i = __is.rdbuf()->sgetc();
if (_Traits::eq_int_type(__i, _Traits::eof())) {
__state |= ios_base::eofbit;
break;
}
_CharT __ch = _Traits::to_char_type(__i);
if (!_Traits::eq(__ch, __zero) && !_Traits::eq(__ch, __one))
break;
__str.push_back(__ch);
++__c;
__is.rdbuf()->sbumpc();
}
__x = bitset<_Size>(__str);
if (_Size > 0 && __c == 0)
__state |= ios_base::failbit;
# if _LIBCPP_HAS_EXCEPTIONS
} catch (...) {
__state |= ios_base::badbit;
__is.__setstate_nothrow(__state);
if (__is.exceptions() & ios_base::badbit) {
throw;
}
}
# endif
__is.setstate(__state);
}
return __is;
}
extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_istream<char>;
# if _LIBCPP_HAS_WIDE_CHARACTERS
extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_istream<wchar_t>;
# endif
extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_iostream<char>;
_LIBCPP_END_NAMESPACE_STD
# endif // _LIBCPP_HAS_LOCALIZATION
# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
# include <concepts>
# include <iosfwd>
# include <ostream>
# include <type_traits>
# endif
_LIBCPP_POP_MACROS
#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
#endif // _LIBCPP_ISTREAM
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