cpp-d1064d

[cross.git] / i686-linux-gnu-4.7 / usr / include / c++ / 4.7 / ext / cast.h

diff --git a/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/cast.h b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/cast.h
new file mode 100644 (file)
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+++ b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/cast.h
@@ -0,0 +1,121 @@
+// <cast.h> -*- C++ -*-
+
+// Copyright (C) 2008, 2009, 2010 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/cast.h
+ *  This is an internal header file, included by other library headers.
+ *  Do not attempt to use it directly. @headername{ext/pointer.h}
+ */
+
+#ifndef _GLIBCXX_CAST_H
+#define _GLIBCXX_CAST_H 1
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  /**
+   * These functions are here to allow containers to support non standard
+   * pointer types.  For normal pointers, these resolve to the use of the
+   * standard cast operation.  For other types the functions will perform
+   * the apprpriate cast to/from the custom pointer class so long as that
+   * class meets the following conditions:
+   * 1) has a typedef element_type which names tehe type it points to.
+   * 2) has a get() const method which returns element_type*.
+   * 3) has a constructor which can take one element_type* argument.
+   */
+
+  /**
+   * This type supports the semantics of the pointer cast operators (below.)
+   */
+  template<typename _ToType>
+    struct _Caster
+    { typedef typename _ToType::element_type*  type; };
+
+  template<typename _ToType>
+    struct _Caster<_ToType*>
+    { typedef _ToType*  type; };
+
+  /**
+   * Casting operations for cases where _FromType is not a standard pointer.
+   * _ToType can be a standard or non-standard pointer.  Given that _FromType
+   * is not a pointer, it must have a get() method that returns the standard
+   * pointer equivalent of the address it points to, and must have an
+   * element_type typedef which names the type it points to.
+   */
+  template<typename _ToType, typename _FromType>
+    inline _ToType
+    __static_pointer_cast(const _FromType& __arg)
+    { return _ToType(static_cast<typename _Caster<_ToType>::
+                    type>(__arg.get())); }
+
+  template<typename _ToType, typename _FromType>
+    inline _ToType
+    __dynamic_pointer_cast(const _FromType& __arg)
+    { return _ToType(dynamic_cast<typename _Caster<_ToType>::
+                    type>(__arg.get())); }
+
+  template<typename _ToType, typename _FromType>
+    inline _ToType
+    __const_pointer_cast(const _FromType& __arg)
+    { return _ToType(const_cast<typename _Caster<_ToType>::
+                    type>(__arg.get())); }
+
+  template<typename _ToType, typename _FromType>
+    inline _ToType
+    __reinterpret_pointer_cast(const _FromType& __arg)
+    { return _ToType(reinterpret_cast<typename _Caster<_ToType>::
+                    type>(__arg.get())); }
+
+  /**
+   * Casting operations for cases where _FromType is a standard pointer.
+   * _ToType can be a standard or non-standard pointer.
+   */
+  template<typename _ToType, typename _FromType>
+    inline _ToType
+    __static_pointer_cast(_FromType* __arg)
+    { return _ToType(static_cast<typename _Caster<_ToType>::
+                    type>(__arg)); }
+
+  template<typename _ToType, typename _FromType>
+    inline _ToType
+    __dynamic_pointer_cast(_FromType* __arg)
+    { return _ToType(dynamic_cast<typename _Caster<_ToType>::
+                    type>(__arg)); }
+
+  template<typename _ToType, typename _FromType>
+    inline _ToType
+    __const_pointer_cast(_FromType* __arg)
+    { return _ToType(const_cast<typename _Caster<_ToType>::
+                    type>(__arg)); }
+
+  template<typename _ToType, typename _FromType>
+    inline _ToType
+    __reinterpret_pointer_cast(_FromType* __arg)
+    { return _ToType(reinterpret_cast<typename _Caster<_ToType>::
+                    type>(__arg)); }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif // _GLIBCXX_CAST_H