libstdc++-v3/libsupc++/new

   1 // The -*- C++ -*- dynamic memory management header.
   2
   3 // Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
   4 // 2003, 2004, 2005, 2006, 2007, 2009, 2010
   5 // Free Software Foundation
   6
   7 // This file is part of GCC.
   8 //
   9 // GCC is free software; you can redistribute it and/or modify
  10 // it under the terms of the GNU General Public License as published by
  11 // the Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13 //
  14 // GCC is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18 //
  19 // Under Section 7 of GPL version 3, you are granted additional
  20 // permissions described in the GCC Runtime Library Exception, version
  21 // 3.1, as published by the Free Software Foundation.
  22
  23 // You should have received a copy of the GNU General Public License and
  24 // a copy of the GCC Runtime Library Exception along with this program;
  25 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  26 // <http://www.gnu.org/licenses/>.
  27
  28 /** @file new
  29  *  This is a Standard C++ Library header.
  30  *
  31  *  The header @c new defines several functions to manage dynamic memory and
  32  *  handling memory allocation errors; see
  33  *  http://gcc.gnu.org/onlinedocs/libstdc++/18_support/howto.html#4 for more.
  34  */
  35
  36 #ifndef _NEW
  37 #define _NEW
  38
  39 #pragma GCC system_header
  40
  41 #include <bits/c++config.h>
  42 #include <exception>
  43
  44 #pragma GCC visibility push(default)
  45
  46 extern "C++" {
  47
  48 namespace std
  49 {
  50   /**
  51    *  @brief  Exception possibly thrown by @c new.
  52    *  @ingroup exceptions
  53    *
  54    *  @c bad_alloc (or classes derived from it) is used to report allocation
  55    *  errors from the throwing forms of @c new.  */
  56   class bad_alloc : public exception
  57   {
  58   public:
  59     bad_alloc() throw() { }
  60
  61     // This declaration is not useless:
  62     // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
  63     virtual ~bad_alloc() throw();
  64
  65     // See comment in eh_exception.cc.
  66     virtual const char* what() const throw();
  67   };
  68
  69   struct nothrow_t { };
  70
  71   extern const nothrow_t nothrow;
  72
  73   /** If you write your own error handler to be called by @c new, it must
  74    *  be of this type.  */
  75   typedef void (*new_handler)();
  76
  77   /// Takes a replacement handler as the argument, returns the
  78   /// previous handler.
  79   new_handler set_new_handler(new_handler) throw();
  80 } // namespace std
  81
  82 //@{
  83 /** These are replaceable signatures:
  84  *  - normal single new and delete (no arguments, throw @c bad_alloc on error)
  85  *  - normal array new and delete (same)
  86  *  - @c nothrow single new and delete (take a @c nothrow argument, return
  87  *    @c NULL on error)
  88  *  - @c nothrow array new and delete (same)
  89  *
  90  *  Placement new and delete signatures (take a memory address argument,
  91  *  does nothing) may not be replaced by a user's program.
  92 */
  93 void* operator new(std::size_t) throw (std::bad_alloc);
  94 void* operator new[](std::size_t) throw (std::bad_alloc);
  95 void operator delete(void*) throw();
  96 void operator delete[](void*) throw();
  97 void* operator new(std::size_t, const std::nothrow_t&) throw();
  98 void* operator new[](std::size_t, const std::nothrow_t&) throw();
  99 void operator delete(void*, const std::nothrow_t&) throw();
 100 void operator delete[](void*, const std::nothrow_t&) throw();
 101
 102 // Default placement versions of operator new.
 103 inline void* operator new(std::size_t, void* __p) throw() { return __p; }
 104 inline void* operator new[](std::size_t, void* __p) throw() { return __p; }
 105
 106 // Default placement versions of operator delete.
 107 inline void  operator delete  (void*, void*) throw() { }
 108 inline void  operator delete[](void*, void*) throw() { }
 109 //@}
 110 } // extern "C++"
 111
 112 #pragma GCC visibility pop
 113
 114 #endif