--- /dev/null
+// Input streams -*- C++ -*-
+
+// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+// 2006, 2007, 2008, 2009, 2010, 2011
+// 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
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+//
+// ISO C++ 14882: 27.6.1 Input streams
+//
+
+/** @file include/istream
+ * This is a Standard C++ Library header.
+ */
+
+#ifndef _GLIBCXX_ISTREAM
+#define _GLIBCXX_ISTREAM 1
+
+#pragma GCC system_header
+
+#include <ios>
+#include <ostream>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /**
+ * @brief Template class basic_istream.
+ * @ingroup io
+ *
+ * This is the base class for all input streams. It provides text
+ * formatting of all builtin types, and communicates with any class
+ * derived from basic_streambuf to do the actual input.
+ */
+ template<typename _CharT, typename _Traits>
+ class basic_istream : virtual public basic_ios<_CharT, _Traits>
+ {
+ public:
+ // Types (inherited from basic_ios (27.4.4)):
+ typedef _CharT char_type;
+ typedef typename _Traits::int_type int_type;
+ typedef typename _Traits::pos_type pos_type;
+ typedef typename _Traits::off_type off_type;
+ typedef _Traits traits_type;
+
+ // Non-standard Types:
+ typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
+ typedef basic_ios<_CharT, _Traits> __ios_type;
+ typedef basic_istream<_CharT, _Traits> __istream_type;
+ typedef num_get<_CharT, istreambuf_iterator<_CharT, _Traits> >
+ __num_get_type;
+ typedef ctype<_CharT> __ctype_type;
+
+ protected:
+ // Data Members:
+ /**
+ * The number of characters extracted in the previous unformatted
+ * function; see gcount().
+ */
+ streamsize _M_gcount;
+
+ public:
+ /**
+ * @brief Base constructor.
+ *
+ * This ctor is almost never called by the user directly, rather from
+ * derived classes' initialization lists, which pass a pointer to
+ * their own stream buffer.
+ */
+ explicit
+ basic_istream(__streambuf_type* __sb)
+ : _M_gcount(streamsize(0))
+ { this->init(__sb); }
+
+ /**
+ * @brief Base destructor.
+ *
+ * This does very little apart from providing a virtual base dtor.
+ */
+ virtual
+ ~basic_istream()
+ { _M_gcount = streamsize(0); }
+
+ /// Safe prefix/suffix operations.
+ class sentry;
+ friend class sentry;
+
+ //@{
+ /**
+ * @brief Interface for manipulators.
+ *
+ * Manipulators such as @c std::ws and @c std::dec use these
+ * functions in constructs like
+ * <code>std::cin >> std::ws</code>.
+ * For more information, see the iomanip header.
+ */
+ __istream_type&
+ operator>>(__istream_type& (*__pf)(__istream_type&))
+ { return __pf(*this); }
+
+ __istream_type&
+ operator>>(__ios_type& (*__pf)(__ios_type&))
+ {
+ __pf(*this);
+ return *this;
+ }
+
+ __istream_type&
+ operator>>(ios_base& (*__pf)(ios_base&))
+ {
+ __pf(*this);
+ return *this;
+ }
+ //@}
+
+ //@{
+ /**
+ * @name Extractors
+ *
+ * All the @c operator>> functions (aka <em>formatted input
+ * functions</em>) have some common behavior. Each starts by
+ * constructing a temporary object of type std::basic_istream::sentry
+ * with the second argument (noskipws) set to false. This has several
+ * effects, concluding with the setting of a status flag; see the
+ * sentry documentation for more.
+ *
+ * If the sentry status is good, the function tries to extract
+ * whatever data is appropriate for the type of the argument.
+ *
+ * If an exception is thrown during extraction, ios_base::badbit
+ * will be turned on in the stream's error state without causing an
+ * ios_base::failure to be thrown. The original exception will then
+ * be rethrown.
+ */
+
+ //@{
+ /**
+ * @brief Integer arithmetic extractors
+ * @param __n A variable of builtin integral type.
+ * @return @c *this if successful
+ *
+ * These functions use the stream's current locale (specifically, the
+ * @c num_get facet) to parse the input data.
+ */
+ __istream_type&
+ operator>>(bool& __n)
+ { return _M_extract(__n); }
+
+ __istream_type&
+ operator>>(short& __n);
+
+ __istream_type&
+ operator>>(unsigned short& __n)
+ { return _M_extract(__n); }
+
+ __istream_type&
+ operator>>(int& __n);
+
+ __istream_type&
+ operator>>(unsigned int& __n)
+ { return _M_extract(__n); }
+
+ __istream_type&
+ operator>>(long& __n)
+ { return _M_extract(__n); }
+
+ __istream_type&
+ operator>>(unsigned long& __n)
+ { return _M_extract(__n); }
+
+#ifdef _GLIBCXX_USE_LONG_LONG
+ __istream_type&
+ operator>>(long long& __n)
+ { return _M_extract(__n); }
+
+ __istream_type&
+ operator>>(unsigned long long& __n)
+ { return _M_extract(__n); }
+#endif
+ //@}
+
+ //@{
+ /**
+ * @brief Floating point arithmetic extractors
+ * @param __f A variable of builtin floating point type.
+ * @return @c *this if successful
+ *
+ * These functions use the stream's current locale (specifically, the
+ * @c num_get facet) to parse the input data.
+ */
+ __istream_type&
+ operator>>(float& __f)
+ { return _M_extract(__f); }
+
+ __istream_type&
+ operator>>(double& __f)
+ { return _M_extract(__f); }
+
+ __istream_type&
+ operator>>(long double& __f)
+ { return _M_extract(__f); }
+ //@}
+
+ /**
+ * @brief Basic arithmetic extractors
+ * @param __p A variable of pointer type.
+ * @return @c *this if successful
+ *
+ * These functions use the stream's current locale (specifically, the
+ * @c num_get facet) to parse the input data.
+ */
+ __istream_type&
+ operator>>(void*& __p)
+ { return _M_extract(__p); }
+
+ /**
+ * @brief Extracting into another streambuf.
+ * @param __sb A pointer to a streambuf
+ *
+ * This function behaves like one of the basic arithmetic extractors,
+ * in that it also constructs a sentry object and has the same error
+ * handling behavior.
+ *
+ * If @p __sb is NULL, the stream will set failbit in its error state.
+ *
+ * Characters are extracted from this stream and inserted into the
+ * @p __sb streambuf until one of the following occurs:
+ *
+ * - the input stream reaches end-of-file,
+ * - insertion into the output buffer fails (in this case, the
+ * character that would have been inserted is not extracted), or
+ * - an exception occurs (and in this case is caught)
+ *
+ * If the function inserts no characters, failbit is set.
+ */
+ __istream_type&
+ operator>>(__streambuf_type* __sb);
+ //@}
+
+ // [27.6.1.3] unformatted input
+ /**
+ * @brief Character counting
+ * @return The number of characters extracted by the previous
+ * unformatted input function dispatched for this stream.
+ */
+ streamsize
+ gcount() const
+ { return _M_gcount; }
+
+ //@{
+ /**
+ * @name Unformatted Input Functions
+ *
+ * All the unformatted input functions have some common behavior.
+ * Each starts by constructing a temporary object of type
+ * std::basic_istream::sentry with the second argument (noskipws)
+ * set to true. This has several effects, concluding with the
+ * setting of a status flag; see the sentry documentation for more.
+ *
+ * If the sentry status is good, the function tries to extract
+ * whatever data is appropriate for the type of the argument.
+ *
+ * The number of characters extracted is stored for later retrieval
+ * by gcount().
+ *
+ * If an exception is thrown during extraction, ios_base::badbit
+ * will be turned on in the stream's error state without causing an
+ * ios_base::failure to be thrown. The original exception will then
+ * be rethrown.
+ */
+
+ /**
+ * @brief Simple extraction.
+ * @return A character, or eof().
+ *
+ * Tries to extract a character. If none are available, sets failbit
+ * and returns traits::eof().
+ */
+ int_type
+ get();
+
+ /**
+ * @brief Simple extraction.
+ * @param __c The character in which to store data.
+ * @return *this
+ *
+ * Tries to extract a character and store it in @a __c. If none are
+ * available, sets failbit and returns traits::eof().
+ *
+ * @note This function is not overloaded on signed char and
+ * unsigned char.
+ */
+ __istream_type&
+ get(char_type& __c);
+
+ /**
+ * @brief Simple multiple-character extraction.
+ * @param __s Pointer to an array.
+ * @param __n Maximum number of characters to store in @a __s.
+ * @param __delim A "stop" character.
+ * @return *this
+ *
+ * Characters are extracted and stored into @a __s until one of the
+ * following happens:
+ *
+ * - @c __n-1 characters are stored
+ * - the input sequence reaches EOF
+ * - the next character equals @a __delim, in which case the character
+ * is not extracted
+ *
+ * If no characters are stored, failbit is set in the stream's error
+ * state.
+ *
+ * In any case, a null character is stored into the next location in
+ * the array.
+ *
+ * @note This function is not overloaded on signed char and
+ * unsigned char.
+ */
+ __istream_type&
+ get(char_type* __s, streamsize __n, char_type __delim);
+
+ /**
+ * @brief Simple multiple-character extraction.
+ * @param __s Pointer to an array.
+ * @param __n Maximum number of characters to store in @a s.
+ * @return *this
+ *
+ * Returns @c get(__s,__n,widen('\\n')).
+ */
+ __istream_type&
+ get(char_type* __s, streamsize __n)
+ { return this->get(__s, __n, this->widen('\n')); }
+
+ /**
+ * @brief Extraction into another streambuf.
+ * @param __sb A streambuf in which to store data.
+ * @param __delim A "stop" character.
+ * @return *this
+ *
+ * Characters are extracted and inserted into @a __sb until one of the
+ * following happens:
+ *
+ * - the input sequence reaches EOF
+ * - insertion into the output buffer fails (in this case, the
+ * character that would have been inserted is not extracted)
+ * - the next character equals @a __delim (in this case, the character
+ * is not extracted)
+ * - an exception occurs (and in this case is caught)
+ *
+ * If no characters are stored, failbit is set in the stream's error
+ * state.
+ */
+ __istream_type&
+ get(__streambuf_type& __sb, char_type __delim);
+
+ /**
+ * @brief Extraction into another streambuf.
+ * @param __sb A streambuf in which to store data.
+ * @return *this
+ *
+ * Returns @c get(__sb,widen('\\n')).
+ */
+ __istream_type&
+ get(__streambuf_type& __sb)
+ { return this->get(__sb, this->widen('\n')); }
+
+ /**
+ * @brief String extraction.
+ * @param __s A character array in which to store the data.
+ * @param __n Maximum number of characters to extract.
+ * @param __delim A "stop" character.
+ * @return *this
+ *
+ * Extracts and stores characters into @a __s until one of the
+ * following happens. Note that these criteria are required to be
+ * tested in the order listed here, to allow an input line to exactly
+ * fill the @a __s array without setting failbit.
+ *
+ * -# the input sequence reaches end-of-file, in which case eofbit
+ * is set in the stream error state
+ * -# the next character equals @c __delim, in which case the character
+ * is extracted (and therefore counted in @c gcount()) but not stored
+ * -# @c __n-1 characters are stored, in which case failbit is set
+ * in the stream error state
+ *
+ * If no characters are extracted, failbit is set. (An empty line of
+ * input should therefore not cause failbit to be set.)
+ *
+ * In any case, a null character is stored in the next location in
+ * the array.
+ */
+ __istream_type&
+ getline(char_type* __s, streamsize __n, char_type __delim);
+
+ /**
+ * @brief String extraction.
+ * @param __s A character array in which to store the data.
+ * @param __n Maximum number of characters to extract.
+ * @return *this
+ *
+ * Returns @c getline(__s,__n,widen('\\n')).
+ */
+ __istream_type&
+ getline(char_type* __s, streamsize __n)
+ { return this->getline(__s, __n, this->widen('\n')); }
+
+ /**
+ * @brief Discarding characters
+ * @param __n Number of characters to discard.
+ * @param __delim A "stop" character.
+ * @return *this
+ *
+ * Extracts characters and throws them away until one of the
+ * following happens:
+ * - if @a __n @c != @c std::numeric_limits<int>::max(), @a __n
+ * characters are extracted
+ * - the input sequence reaches end-of-file
+ * - the next character equals @a __delim (in this case, the character
+ * is extracted); note that this condition will never occur if
+ * @a __delim equals @c traits::eof().
+ *
+ * NB: Provide three overloads, instead of the single function
+ * (with defaults) mandated by the Standard: this leads to a
+ * better performing implementation, while still conforming to
+ * the Standard.
+ */
+ __istream_type&
+ ignore(streamsize __n, int_type __delim);
+
+ __istream_type&
+ ignore(streamsize __n);
+
+ __istream_type&
+ ignore();
+
+ /**
+ * @brief Looking ahead in the stream
+ * @return The next character, or eof().
+ *
+ * If, after constructing the sentry object, @c good() is false,
+ * returns @c traits::eof(). Otherwise reads but does not extract
+ * the next input character.
+ */
+ int_type
+ peek();
+
+ /**
+ * @brief Extraction without delimiters.
+ * @param __s A character array.
+ * @param __n Maximum number of characters to store.
+ * @return *this
+ *
+ * If the stream state is @c good(), extracts characters and stores
+ * them into @a __s until one of the following happens:
+ * - @a __n characters are stored
+ * - the input sequence reaches end-of-file, in which case the error
+ * state is set to @c failbit|eofbit.
+ *
+ * @note This function is not overloaded on signed char and
+ * unsigned char.
+ */
+ __istream_type&
+ read(char_type* __s, streamsize __n);
+
+ /**
+ * @brief Extraction until the buffer is exhausted, but no more.
+ * @param __s A character array.
+ * @param __n Maximum number of characters to store.
+ * @return The number of characters extracted.
+ *
+ * Extracts characters and stores them into @a __s depending on the
+ * number of characters remaining in the streambuf's buffer,
+ * @c rdbuf()->in_avail(), called @c A here:
+ * - if @c A @c == @c -1, sets eofbit and extracts no characters
+ * - if @c A @c == @c 0, extracts no characters
+ * - if @c A @c > @c 0, extracts @c min(A,n)
+ *
+ * The goal is to empty the current buffer, and to not request any
+ * more from the external input sequence controlled by the streambuf.
+ */
+ streamsize
+ readsome(char_type* __s, streamsize __n);
+
+ /**
+ * @brief Unextracting a single character.
+ * @param __c The character to push back into the input stream.
+ * @return *this
+ *
+ * If @c rdbuf() is not null, calls @c rdbuf()->sputbackc(c).
+ *
+ * If @c rdbuf() is null or if @c sputbackc() fails, sets badbit in
+ * the error state.
+ *
+ * @note This function first clears eofbit. Since no characters
+ * are extracted, the next call to @c gcount() will return 0,
+ * as required by DR 60.
+ */
+ __istream_type&
+ putback(char_type __c);
+
+ /**
+ * @brief Unextracting the previous character.
+ * @return *this
+ *
+ * If @c rdbuf() is not null, calls @c rdbuf()->sungetc(c).
+ *
+ * If @c rdbuf() is null or if @c sungetc() fails, sets badbit in
+ * the error state.
+ *
+ * @note This function first clears eofbit. Since no characters
+ * are extracted, the next call to @c gcount() will return 0,
+ * as required by DR 60.
+ */
+ __istream_type&
+ unget();
+
+ /**
+ * @brief Synchronizing the stream buffer.
+ * @return 0 on success, -1 on failure
+ *
+ * If @c rdbuf() is a null pointer, returns -1.
+ *
+ * Otherwise, calls @c rdbuf()->pubsync(), and if that returns -1,
+ * sets badbit and returns -1.
+ *
+ * Otherwise, returns 0.
+ *
+ * @note This function does not count the number of characters
+ * extracted, if any, and therefore does not affect the next
+ * call to @c gcount().
+ */
+ int
+ sync();
+
+ /**
+ * @brief Getting the current read position.
+ * @return A file position object.
+ *
+ * If @c fail() is not false, returns @c pos_type(-1) to indicate
+ * failure. Otherwise returns @c rdbuf()->pubseekoff(0,cur,in).
+ *
+ * @note This function does not count the number of characters
+ * extracted, if any, and therefore does not affect the next
+ * call to @c gcount(). At variance with putback, unget and
+ * seekg, eofbit is not cleared first.
+ */
+ pos_type
+ tellg();
+
+ /**
+ * @brief Changing the current read position.
+ * @param __pos A file position object.
+ * @return *this
+ *
+ * If @c fail() is not true, calls @c rdbuf()->pubseekpos(__pos). If
+ * that function fails, sets failbit.
+ *
+ * @note This function first clears eofbit. It does not count the
+ * number of characters extracted, if any, and therefore does
+ * not affect the next call to @c gcount().
+ */
+ __istream_type&
+ seekg(pos_type);
+
+ /**
+ * @brief Changing the current read position.
+ * @param __off A file offset object.
+ * @param __dir The direction in which to seek.
+ * @return *this
+ *
+ * If @c fail() is not true, calls @c rdbuf()->pubseekoff(__off,__dir).
+ * If that function fails, sets failbit.
+ *
+ * @note This function first clears eofbit. It does not count the
+ * number of characters extracted, if any, and therefore does
+ * not affect the next call to @c gcount().
+ */
+ __istream_type&
+ seekg(off_type, ios_base::seekdir);
+ //@}
+
+ protected:
+ basic_istream()
+ : _M_gcount(streamsize(0))
+ { this->init(0); }
+
+ template<typename _ValueT>
+ __istream_type&
+ _M_extract(_ValueT& __v);
+ };
+
+ /// Explicit specialization declarations, defined in src/istream.cc.
+ template<>
+ basic_istream<char>&
+ basic_istream<char>::
+ getline(char_type* __s, streamsize __n, char_type __delim);
+
+ template<>
+ basic_istream<char>&
+ basic_istream<char>::
+ ignore(streamsize __n);
+
+ template<>
+ basic_istream<char>&
+ basic_istream<char>::
+ ignore(streamsize __n, int_type __delim);
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ template<>
+ basic_istream<wchar_t>&
+ basic_istream<wchar_t>::
+ getline(char_type* __s, streamsize __n, char_type __delim);
+
+ template<>
+ basic_istream<wchar_t>&
+ basic_istream<wchar_t>::
+ ignore(streamsize __n);
+
+ template<>
+ basic_istream<wchar_t>&
+ basic_istream<wchar_t>::
+ ignore(streamsize __n, int_type __delim);
+#endif
+
+ /**
+ * @brief Performs setup work for input streams.
+ *
+ * Objects of this class are created before all of the standard
+ * extractors are run. It is responsible for <em>exception-safe
+ * prefix and suffix operations,</em> although only prefix actions
+ * are currently required by the standard.
+ */
+ template<typename _CharT, typename _Traits>
+ class basic_istream<_CharT, _Traits>::sentry
+ {
+ // Data Members.
+ bool _M_ok;
+
+ public:
+ /// Easy access to dependant types.
+ typedef _Traits traits_type;
+ typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
+ typedef basic_istream<_CharT, _Traits> __istream_type;
+ typedef typename __istream_type::__ctype_type __ctype_type;
+ typedef typename _Traits::int_type __int_type;
+
+ /**
+ * @brief The constructor performs all the work.
+ * @param __is The input stream to guard.
+ * @param __noskipws Whether to consume whitespace or not.
+ *
+ * If the stream state is good (@a __is.good() is true), then the
+ * following actions are performed, otherwise the sentry state
+ * is false (<em>not okay</em>) and failbit is set in the
+ * stream state.
+ *
+ * The sentry's preparatory actions are:
+ *
+ * -# if the stream is tied to an output stream, @c is.tie()->flush()
+ * is called to synchronize the output sequence
+ * -# if @a __noskipws is false, and @c ios_base::skipws is set in
+ * @c is.flags(), the sentry extracts and discards whitespace
+ * characters from the stream. The currently imbued locale is
+ * used to determine whether each character is whitespace.
+ *
+ * If the stream state is still good, then the sentry state becomes
+ * true (@a okay).
+ */
+ explicit
+ sentry(basic_istream<_CharT, _Traits>& __is, bool __noskipws = false);
+
+ /**
+ * @brief Quick status checking.
+ * @return The sentry state.
+ *
+ * For ease of use, sentries may be converted to booleans. The
+ * return value is that of the sentry state (true == okay).
+ */
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ explicit
+#endif
+ operator bool() const
+ { return _M_ok; }
+ };
+
+ //@{
+ /**
+ * @brief Character extractors
+ * @param __in An input stream.
+ * @param __c A character reference.
+ * @return in
+ *
+ * Behaves like one of the formatted arithmetic extractors described in
+ * std::basic_istream. After constructing a sentry object with good
+ * status, this function extracts a character (if one is available) and
+ * stores it in @a __c. Otherwise, sets failbit in the input stream.
+ */
+ template<typename _CharT, typename _Traits>
+ basic_istream<_CharT, _Traits>&
+ operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c);
+
+ template<class _Traits>
+ inline basic_istream<char, _Traits>&
+ operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
+ { return (__in >> reinterpret_cast<char&>(__c)); }
+
+ template<class _Traits>
+ inline basic_istream<char, _Traits>&
+ operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
+ { return (__in >> reinterpret_cast<char&>(__c)); }
+ //@}
+
+ //@{
+ /**
+ * @brief Character string extractors
+ * @param __in An input stream.
+ * @param __s A pointer to a character array.
+ * @return __in
+ *
+ * Behaves like one of the formatted arithmetic extractors described in
+ * std::basic_istream. After constructing a sentry object with good
+ * status, this function extracts up to @c n characters and stores them
+ * into the array starting at @a __s. @c n is defined as:
+ *
+ * - if @c width() is greater than zero, @c n is width() otherwise
+ * - @c n is <em>the number of elements of the largest array of *
+ * - @c char_type that can store a terminating @c eos.</em>
+ * - [27.6.1.2.3]/6
+ *
+ * Characters are extracted and stored until one of the following happens:
+ * - @c n-1 characters are stored
+ * - EOF is reached
+ * - the next character is whitespace according to the current locale
+ * - the next character is a null byte (i.e., @c charT() )
+ *
+ * @c width(0) is then called for the input stream.
+ *
+ * If no characters are extracted, sets failbit.
+ */
+ template<typename _CharT, typename _Traits>
+ basic_istream<_CharT, _Traits>&
+ operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s);
+
+ // Explicit specialization declaration, defined in src/istream.cc.
+ template<>
+ basic_istream<char>&
+ operator>>(basic_istream<char>& __in, char* __s);
+
+ template<class _Traits>
+ inline basic_istream<char, _Traits>&
+ operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
+ { return (__in >> reinterpret_cast<char*>(__s)); }
+
+ template<class _Traits>
+ inline basic_istream<char, _Traits>&
+ operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
+ { return (__in >> reinterpret_cast<char*>(__s)); }
+ //@}
+
+ /**
+ * @brief Template class basic_iostream
+ * @ingroup io
+ *
+ * This class multiply inherits from the input and output stream classes
+ * simply to provide a single interface.
+ */
+ template<typename _CharT, typename _Traits>
+ class basic_iostream
+ : public basic_istream<_CharT, _Traits>,
+ public basic_ostream<_CharT, _Traits>
+ {
+ public:
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 271. basic_iostream missing typedefs
+ // Types (inherited):
+ typedef _CharT char_type;
+ typedef typename _Traits::int_type int_type;
+ typedef typename _Traits::pos_type pos_type;
+ typedef typename _Traits::off_type off_type;
+ typedef _Traits traits_type;
+
+ // Non-standard Types:
+ typedef basic_istream<_CharT, _Traits> __istream_type;
+ typedef basic_ostream<_CharT, _Traits> __ostream_type;
+
+ /**
+ * @brief Constructor does nothing.
+ *
+ * Both of the parent classes are initialized with the same
+ * streambuf pointer passed to this constructor.
+ */
+ explicit
+ basic_iostream(basic_streambuf<_CharT, _Traits>* __sb)
+ : __istream_type(__sb), __ostream_type(__sb) { }
+
+ /**
+ * @brief Destructor does nothing.
+ */
+ virtual
+ ~basic_iostream() { }
+
+ protected:
+ basic_iostream()
+ : __istream_type(), __ostream_type() { }
+ };
+
+ /**
+ * @brief Quick and easy way to eat whitespace
+ *
+ * This manipulator extracts whitespace characters, stopping when the
+ * next character is non-whitespace, or when the input sequence is empty.
+ * If the sequence is empty, @c eofbit is set in the stream, but not
+ * @c failbit.
+ *
+ * The current locale is used to distinguish whitespace characters.
+ *
+ * Example:
+ * @code
+ * MyClass mc;
+ *
+ * std::cin >> std::ws >> mc;
+ * @endcode
+ * will skip leading whitespace before calling operator>> on cin and your
+ * object. Note that the same effect can be achieved by creating a
+ * std::basic_istream::sentry inside your definition of operator>>.
+ */
+ template<typename _CharT, typename _Traits>
+ basic_istream<_CharT, _Traits>&
+ ws(basic_istream<_CharT, _Traits>& __is);
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ // [27.7.1.6] Rvalue stream extraction
+ /**
+ * @brief Generic extractor for rvalue stream
+ * @param __is An input stream.
+ * @param __x A reference to the extraction target.
+ * @return is
+ *
+ * This is just a forwarding function to allow extraction from
+ * rvalue streams since they won't bind to the extractor functions
+ * that take an lvalue reference.
+ */
+ template<typename _CharT, typename _Traits, typename _Tp>
+ inline basic_istream<_CharT, _Traits>&
+ operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)
+ { return (__is >> __x); }
+#endif // __GXX_EXPERIMENTAL_CXX0X__
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#include <bits/istream.tcc>
+
+#endif /* _GLIBCXX_ISTREAM */
projects / cross.git / blobdiff