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diff --git a/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/string_conversions.h b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/string_conversions.h
new file mode 100644
index 0000000..b017530
--- /dev/null
+++ b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/string_conversions.h
@@ -0,0 +1,107 @@
+// String Conversions -*- C++ -*-
+
+// Copyright (C) 2008, 2009, 2010, 2012 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 ext/string_conversions.h
+ *  This file is a GNU extension to the Standard C++ Library.
+ */
+
+#ifndef _STRING_CONVERSIONS_H
+#define _STRING_CONVERSIONS_H 1
+
+#pragma GCC system_header
+
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+# include <bits/c++0x_warning.h>
+#else
+
+#include <bits/c++config.h>
+#include <ext/numeric_traits.h>
+#include <bits/functexcept.h>
+#include <cstdlib>
+#include <cwchar>
+#include <cstdio>
+#include <cerrno>
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  // Helper for all the sto* functions.
+  template<typename _TRet, typename _Ret = _TRet, typename _CharT,
+	   typename... _Base>
+    _Ret
+    __stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...),
+	   const char* __name, const _CharT* __str, std::size_t* __idx,
+	   _Base... __base)
+    {
+      _Ret __ret;
+
+      _CharT* __endptr;
+      errno = 0;
+      const _TRet __tmp = __convf(__str, &__endptr, __base...);
+
+      if (__endptr == __str)
+	std::__throw_invalid_argument(__name);
+      else if (errno == ERANGE
+	       || (std::__are_same<_Ret, int>::__value
+		   && (__tmp < __numeric_traits<int>::__min
+		       || __tmp > __numeric_traits<int>::__max)))
+	std::__throw_out_of_range(__name);
+      else
+	__ret = __tmp;
+
+      if (__idx)
+	*__idx = __endptr - __str;
+
+      return __ret;
+    }
+
+  // Helper for the to_string / to_wstring functions.
+  template<typename _String, typename _CharT = typename _String::value_type>
+    _String
+    __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*,
+				 __builtin_va_list), std::size_t __n,
+		 const _CharT* __fmt, ...)
+    {
+      // XXX Eventually the result will be constructed in place in
+      // the C++0x string, likely with the help of internal hooks.
+      _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
+							  * __n));
+
+      __builtin_va_list __args;
+      __builtin_va_start(__args, __fmt);
+
+      const int __len = __convf(__s, __n, __fmt, __args);
+
+      __builtin_va_end(__args);
+
+      return _String(__s, __s + __len);
+    }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif // C++11
+
+#endif // _STRING_CONVERSIONS_H