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+// Output streams -*- C++ -*-
+
+// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+// 2006, 2007, 2008, 2009
+// 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/>.
+
+/** @file ostream
+ * This is a Standard C++ Library header.
+ */
+
+//
+// ISO C++ 14882: 27.6.2 Output streams
+//
+
+#ifndef _GLIBCXX_OSTREAM
+#define _GLIBCXX_OSTREAM 1
+
+#pragma GCC system_header
+
+#include <ios>
+#include <bits/ostream_insert.h>
+
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
+ // [27.6.2.1] Template class basic_ostream
+ /**
+ * @brief Controlling output.
+ * @ingroup io
+ *
+ * This is the base class for all output streams. It provides text
+ * formatting of all builtin types, and communicates with any class
+ * derived from basic_streambuf to do the actual output.
+ */
+ template<typename _CharT, typename _Traits>
+ class basic_ostream : 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_ostream<_CharT, _Traits> __ostream_type;
+ typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> >
+ __num_put_type;
+ typedef ctype<_CharT> __ctype_type;
+
+ // [27.6.2.2] constructor/destructor
+ /**
+ * @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_ostream(__streambuf_type* __sb)
+ { this->init(__sb); }
+
+ /**
+ * @brief Base destructor.
+ *
+ * This does very little apart from providing a virtual base dtor.
+ */
+ virtual
+ ~basic_ostream() { }
+
+ // [27.6.2.3] prefix/suffix
+ class sentry;
+ friend class sentry;
+
+ // [27.6.2.5] formatted output
+ // [27.6.2.5.3] basic_ostream::operator<<
+ //@{
+ /**
+ * @brief Interface for manipulators.
+ *
+ * Manipulators such as @c std::endl and @c std::hex use these
+ * functions in constructs like "std::cout << std::endl". For more
+ * information, see the iomanip header.
+ */
+ __ostream_type&
+ operator<<(__ostream_type& (*__pf)(__ostream_type&))
+ {
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // DR 60. What is a formatted input function?
+ // The inserters for manipulators are *not* formatted output functions.
+ return __pf(*this);
+ }
+
+ __ostream_type&
+ operator<<(__ios_type& (*__pf)(__ios_type&))
+ {
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // DR 60. What is a formatted input function?
+ // The inserters for manipulators are *not* formatted output functions.
+ __pf(*this);
+ return *this;
+ }
+
+ __ostream_type&
+ operator<<(ios_base& (*__pf) (ios_base&))
+ {
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // DR 60. What is a formatted input function?
+ // The inserters for manipulators are *not* formatted output functions.
+ __pf(*this);
+ return *this;
+ }
+ //@}
+
+ // [27.6.2.5.2] arithmetic inserters
+ /**
+ * @name Arithmetic Inserters
+ *
+ * All the @c operator<< functions (aka <em>formatted output
+ * functions</em>) have some common behavior. Each starts by
+ * constructing a temporary object of type std::basic_ostream::sentry.
+ * This can have 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 generate
+ * whatever data is appropriate for the type of the argument.
+ *
+ * If an exception is thrown during insertion, 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 Basic arithmetic inserters
+ * @param A variable of builtin type.
+ * @return @c *this if successful
+ *
+ * These functions use the stream's current locale (specifically, the
+ * @c num_get facet) to perform numeric formatting.
+ */
+ __ostream_type&
+ operator<<(long __n)
+ { return _M_insert(__n); }
+
+ __ostream_type&
+ operator<<(unsigned long __n)
+ { return _M_insert(__n); }
+
+ __ostream_type&
+ operator<<(bool __n)
+ { return _M_insert(__n); }
+
+ __ostream_type&
+ operator<<(short __n);
+
+ __ostream_type&
+ operator<<(unsigned short __n)
+ {
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 117. basic_ostream uses nonexistent num_put member functions.
+ return _M_insert(static_cast<unsigned long>(__n));
+ }
+
+ __ostream_type&
+ operator<<(int __n);
+
+ __ostream_type&
+ operator<<(unsigned int __n)
+ {
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 117. basic_ostream uses nonexistent num_put member functions.
+ return _M_insert(static_cast<unsigned long>(__n));
+ }
+
+#ifdef _GLIBCXX_USE_LONG_LONG
+ __ostream_type&
+ operator<<(long long __n)
+ { return _M_insert(__n); }
+
+ __ostream_type&
+ operator<<(unsigned long long __n)
+ { return _M_insert(__n); }
+#endif
+
+ __ostream_type&
+ operator<<(double __f)
+ { return _M_insert(__f); }
+
+ __ostream_type&
+ operator<<(float __f)
+ {
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 117. basic_ostream uses nonexistent num_put member functions.
+ return _M_insert(static_cast<double>(__f));
+ }
+
+ __ostream_type&
+ operator<<(long double __f)
+ { return _M_insert(__f); }
+
+ __ostream_type&
+ operator<<(const void* __p)
+ { return _M_insert(__p); }
+
+ /**
+ * @brief Extracting from 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 @a sb is NULL, the stream will set failbit in its error state.
+ *
+ * Characters are extracted from @a sb and inserted into @c *this
+ * until one of the following occurs:
+ *
+ * - the input stream reaches end-of-file,
+ * - insertion into the output sequence fails (in this case, the
+ * character that would have been inserted is not extracted), or
+ * - an exception occurs while getting a character from @a sb, which
+ * sets failbit in the error state
+ *
+ * If the function inserts no characters, failbit is set.
+ */
+ __ostream_type&
+ operator<<(__streambuf_type* __sb);
+ //@}
+
+ // [27.6.2.6] unformatted output functions
+ /**
+ * @name Unformatted Output Functions
+ *
+ * All the unformatted output functions have some common behavior.
+ * Each starts by constructing a temporary object of type
+ * std::basic_ostream::sentry. 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 generate
+ * whatever data is appropriate for the type of the argument.
+ *
+ * If an exception is thrown during insertion, ios_base::badbit
+ * will be turned on in the stream's error state. If badbit is on in
+ * the stream's exceptions mask, the exception will be rethrown
+ * without completing its actions.
+ */
+ //@{
+ /**
+ * @brief Simple insertion.
+ * @param c The character to insert.
+ * @return *this
+ *
+ * Tries to insert @a c.
+ *
+ * @note This function is not overloaded on signed char and
+ * unsigned char.
+ */
+ __ostream_type&
+ put(char_type __c);
+
+ // Core write functionality, without sentry.
+ void
+ _M_write(const char_type* __s, streamsize __n)
+ {
+ const streamsize __put = this->rdbuf()->sputn(__s, __n);
+ if (__put != __n)
+ this->setstate(ios_base::badbit);
+ }
+
+ /**
+ * @brief Character string insertion.
+ * @param s The array to insert.
+ * @param n Maximum number of characters to insert.
+ * @return *this
+ *
+ * Characters are copied from @a s and inserted into the stream until
+ * one of the following happens:
+ *
+ * - @a n characters are inserted
+ * - inserting into the output sequence fails (in this case, badbit
+ * will be set in the stream's error state)
+ *
+ * @note This function is not overloaded on signed char and
+ * unsigned char.
+ */
+ __ostream_type&
+ write(const char_type* __s, streamsize __n);
+ //@}
+
+ /**
+ * @brief Synchronizing the stream buffer.
+ * @return *this
+ *
+ * If @c rdbuf() is a null pointer, changes nothing.
+ *
+ * Otherwise, calls @c rdbuf()->pubsync(), and if that returns -1,
+ * sets badbit.
+ */
+ __ostream_type&
+ flush();
+
+ // [27.6.2.4] seek members
+ /**
+ * @brief Getting the current write 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,out).
+ */
+ pos_type
+ tellp();
+
+ /**
+ * @brief Changing the current write 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.
+ */
+ __ostream_type&
+ seekp(pos_type);
+
+ /**
+ * @brief Changing the current write 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.
+ */
+ __ostream_type&
+ seekp(off_type, ios_base::seekdir);
+
+ protected:
+ basic_ostream()
+ { this->init(0); }
+
+ template<typename _ValueT>
+ __ostream_type&
+ _M_insert(_ValueT __v);
+ };
+
+ /**
+ * @brief Performs setup work for output streams.
+ *
+ * Objects of this class are created before all of the standard
+ * inserters are run. It is responsible for "exception-safe prefix and
+ * suffix operations."
+ */
+ template <typename _CharT, typename _Traits>
+ class basic_ostream<_CharT, _Traits>::sentry
+ {
+ // Data Members:
+ bool _M_ok;
+ basic_ostream<_CharT, _Traits>& _M_os;
+
+ public:
+ /**
+ * @brief The constructor performs preparatory work.
+ * @param os The output stream to guard.
+ *
+ * If the stream state is good (@a os.good() is true), then if the
+ * stream is tied to another output stream, @c is.tie()->flush()
+ * is called to synchronize the output sequences.
+ *
+ * If the stream state is still good, then the sentry state becomes
+ * true ("okay").
+ */
+ explicit
+ sentry(basic_ostream<_CharT, _Traits>& __os);
+
+ /**
+ * @brief Possibly flushes the stream.
+ *
+ * If @c ios_base::unitbuf is set in @c os.flags(), and
+ * @c std::uncaught_exception() is true, the sentry destructor calls
+ * @c flush() on the output stream.
+ */
+ ~sentry()
+ {
+ // XXX MT
+ if (bool(_M_os.flags() & ios_base::unitbuf) && !uncaught_exception())
+ {
+ // Can't call flush directly or else will get into recursive lock.
+ if (_M_os.rdbuf() && _M_os.rdbuf()->pubsync() == -1)
+ _M_os.setstate(ios_base::badbit);
+ }
+ }
+
+ /**
+ * @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).
+ */
+ operator bool() const
+ { return _M_ok; }
+ };
+
+ // [27.6.2.5.4] character insertion templates
+ //@{
+ /**
+ * @brief Character inserters
+ * @param out An output stream.
+ * @param c A character.
+ * @return out
+ *
+ * Behaves like one of the formatted arithmetic inserters described in
+ * std::basic_ostream. After constructing a sentry object with good
+ * status, this function inserts a single character and any required
+ * padding (as determined by [22.2.2.2.2]). @c out.width(0) is then
+ * called.
+ *
+ * If @a c is of type @c char and the character type of the stream is not
+ * @c char, the character is widened before insertion.
+ */
+ template<typename _CharT, typename _Traits>
+ inline basic_ostream<_CharT, _Traits>&
+ operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
+ { return __ostream_insert(__out, &__c, 1); }
+
+ template<typename _CharT, typename _Traits>
+ inline basic_ostream<_CharT, _Traits>&
+ operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
+ { return (__out << __out.widen(__c)); }
+
+ // Specialization
+ template <class _Traits>
+ inline basic_ostream<char, _Traits>&
+ operator<<(basic_ostream<char, _Traits>& __out, char __c)
+ { return __ostream_insert(__out, &__c, 1); }
+
+ // Signed and unsigned
+ template<class _Traits>
+ inline basic_ostream<char, _Traits>&
+ operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
+ { return (__out << static_cast<char>(__c)); }
+
+ template<class _Traits>
+ inline basic_ostream<char, _Traits>&
+ operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
+ { return (__out << static_cast<char>(__c)); }
+ //@}
+
+ //@{
+ /**
+ * @brief String inserters
+ * @param out An output stream.
+ * @param s A character string.
+ * @return out
+ * @pre @a s must be a non-NULL pointer
+ *
+ * Behaves like one of the formatted arithmetic inserters described in
+ * std::basic_ostream. After constructing a sentry object with good
+ * status, this function inserts @c traits::length(s) characters starting
+ * at @a s, widened if necessary, followed by any required padding (as
+ * determined by [22.2.2.2.2]). @c out.width(0) is then called.
+ */
+ template<typename _CharT, typename _Traits>
+ inline basic_ostream<_CharT, _Traits>&
+ operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
+ {
+ if (!__s)
+ __out.setstate(ios_base::badbit);
+ else
+ __ostream_insert(__out, __s,
+ static_cast<streamsize>(_Traits::length(__s)));
+ return __out;
+ }
+
+ template<typename _CharT, typename _Traits>
+ basic_ostream<_CharT, _Traits> &
+ operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s);
+
+ // Partial specializations
+ template<class _Traits>
+ inline basic_ostream<char, _Traits>&
+ operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
+ {
+ if (!__s)
+ __out.setstate(ios_base::badbit);
+ else
+ __ostream_insert(__out, __s,
+ static_cast<streamsize>(_Traits::length(__s)));
+ return __out;
+ }
+
+ // Signed and unsigned
+ template<class _Traits>
+ inline basic_ostream<char, _Traits>&
+ operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
+ { return (__out << reinterpret_cast<const char*>(__s)); }
+
+ template<class _Traits>
+ inline basic_ostream<char, _Traits> &
+ operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
+ { return (__out << reinterpret_cast<const char*>(__s)); }
+ //@}
+
+ // [27.6.2.7] standard basic_ostream manipulators
+ /**
+ * @brief Write a newline and flush the stream.
+ *
+ * This manipulator is often mistakenly used when a simple newline is
+ * desired, leading to poor buffering performance. See
+ * http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#2 for more
+ * on this subject.
+ */
+ template<typename _CharT, typename _Traits>
+ inline basic_ostream<_CharT, _Traits>&
+ endl(basic_ostream<_CharT, _Traits>& __os)
+ { return flush(__os.put(__os.widen('\n'))); }
+
+ /**
+ * @brief Write a null character into the output sequence.
+ *
+ * "Null character" is @c CharT() by definition. For CharT of @c char,
+ * this correctly writes the ASCII @c NUL character string terminator.
+ */
+ template<typename _CharT, typename _Traits>
+ inline basic_ostream<_CharT, _Traits>&
+ ends(basic_ostream<_CharT, _Traits>& __os)
+ { return __os.put(_CharT()); }
+
+ /**
+ * @brief Flushes the output stream.
+ *
+ * This manipulator simply calls the stream's @c flush() member function.
+ */
+ template<typename _CharT, typename _Traits>
+ inline basic_ostream<_CharT, _Traits>&
+ flush(basic_ostream<_CharT, _Traits>& __os)
+ { return __os.flush(); }
+
+_GLIBCXX_END_NAMESPACE
+
+#ifndef _GLIBCXX_EXPORT_TEMPLATE
+# include <bits/ostream.tcc>
+#endif
+
+#endif /* _GLIBCXX_OSTREAM */
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