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00001 // The -*- C++ -*- dynamic memory management header.
00002 
00003 // Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
00004 // 2003, 2004, 2005, 2006, 2007
00005 // Free Software Foundation
00006 
00007 // This file is part of GCC.
00008 //
00009 // GCC is free software; you can redistribute it and/or modify
00010 // it under the terms of the GNU General Public License as published by
00011 // the Free Software Foundation; either version 2, or (at your option)
00012 // any later version.
00013 // 
00014 // GCC is distributed in the hope that it will be useful,
00015 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00016 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00017 // GNU General Public License for more details.
00018 // 
00019 // You should have received a copy of the GNU General Public License
00020 // along with GCC; see the file COPYING.  If not, write to
00021 // the Free Software Foundation, 51 Franklin Street, Fifth Floor,
00022 // Boston, MA 02110-1301, USA.
00023 
00024 // As a special exception, you may use this file as part of a free software
00025 // library without restriction.  Specifically, if other files instantiate
00026 // templates or use macros or inline functions from this file, or you compile
00027 // this file and link it with other files to produce an executable, this
00028 // file does not by itself cause the resulting executable to be covered by
00029 // the GNU General Public License.  This exception does not however
00030 // invalidate any other reasons why the executable file might be covered by
00031 // the GNU General Public License.
00032 
00033 /** @file new
00034  *  This is a Standard C++ Library header.
00035  *
00036  *  The header @c new defines several functions to manage dynamic memory and
00037  *  handling memory allocation errors; see
00038  *  http://gcc.gnu.org/onlinedocs/libstdc++/18_support/howto.html#4 for more.
00039  */
00040 
00041 #ifndef _NEW
00042 #define _NEW
00043 
00044 #include <cstddef>
00045 #include <exception>
00046 
00047 #pragma GCC visibility push(default)
00048 
00049 extern "C++" {
00050 
00051 namespace std 
00052 {
00053   /**
00054    *  @brief  Exception possibly thrown by @c new.
00055    *
00056    *  @c bad_alloc (or classes derived from it) is used to report allocation
00057    *  errors from the throwing forms of @c new.  */
00058   class bad_alloc : public exception 
00059   {
00060   public:
00061     bad_alloc() throw() { }
00062 
00063     // This declaration is not useless:
00064     // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
00065     virtual ~bad_alloc() throw();
00066 
00067     // See comment in eh_exception.cc.
00068     virtual const char* what() const throw();
00069   };
00070 
00071   struct nothrow_t { };
00072 
00073   extern const nothrow_t nothrow;
00074 
00075   /** If you write your own error handler to be called by @c new, it must
00076    *  be of this type.  */
00077   typedef void (*new_handler)();
00078 
00079   /// Takes a replacement handler as the argument, returns the
00080   /// previous handler.
00081   new_handler set_new_handler(new_handler) throw();
00082 } // namespace std
00083 
00084 //@{
00085 /** These are replaceable signatures:
00086  *  - normal single new and delete (no arguments, throw @c bad_alloc on error)
00087  *  - normal array new and delete (same)
00088  *  - @c nothrow single new and delete (take a @c nothrow argument, return
00089  *    @c NULL on error)
00090  *  - @c nothrow array new and delete (same)
00091  *
00092  *  Placement new and delete signatures (take a memory address argument,
00093  *  does nothing) may not be replaced by a user's program.
00094 */
00095 void* operator new(std::size_t) throw (std::bad_alloc);
00096 void* operator new[](std::size_t) throw (std::bad_alloc);
00097 void operator delete(void*) throw();
00098 void operator delete[](void*) throw();
00099 void* operator new(std::size_t, const std::nothrow_t&) throw();
00100 void* operator new[](std::size_t, const std::nothrow_t&) throw();
00101 void operator delete(void*, const std::nothrow_t&) throw();
00102 void operator delete[](void*, const std::nothrow_t&) throw();
00103 
00104 // Default placement versions of operator new.
00105 inline void* operator new(std::size_t, void* __p) throw() { return __p; }
00106 inline void* operator new[](std::size_t, void* __p) throw() { return __p; }
00107 
00108 // Default placement versions of operator delete.
00109 inline void  operator delete  (void*, void*) throw() { }
00110 inline void  operator delete[](void*, void*) throw() { }
00111 //@}
00112 } // extern "C++"
00113 
00114 #pragma GCC visibility pop
00115 
00116 #endif

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