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, 2011 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) _GLIBCXX_THROW (std::bad_alloc) 94 __attribute__((__externally_visible__)); 95 void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc) 96 __attribute__((__externally_visible__)); 97 void operator delete(void*) _GLIBCXX_USE_NOEXCEPT 98 __attribute__((__externally_visible__)); 99 void operator delete[](void*) _GLIBCXX_USE_NOEXCEPT 100 __attribute__((__externally_visible__)); 101 void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 102 __attribute__((__externally_visible__)); 103 void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 104 __attribute__((__externally_visible__)); 105 void operator delete(void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 106 __attribute__((__externally_visible__)); 107 void operator delete[](void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 108 __attribute__((__externally_visible__)); 109 110 // Default placement versions of operator new. 111 inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT 112 { return __p; } 113 inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT 114 { return __p; } 115 116 // Default placement versions of operator delete. 117 inline void operator delete (void*, void*) _GLIBCXX_USE_NOEXCEPT { } 118 inline void operator delete[](void*, void*) _GLIBCXX_USE_NOEXCEPT { } 119 //@} 120 } // extern "C++" 121 122 #pragma GCC visibility pop 123 124 #endif 125
