1 // The -*- C++ -*- dynamic memory management header. 2 3 // Copyright (C) 1994-2013 Free Software Foundation, Inc. 4 5 // This file is part of GCC. 6 // 7 // GCC is free software; you can redistribute it and/or modify 8 // it under the terms of the GNU General Public License as published by 9 // the Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 // 12 // GCC is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 // 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 /** @file new 27 * This is a Standard C++ Library header. 28 * 29 * The header @c new defines several functions to manage dynamic memory and 30 * handling memory allocation errors; see 31 * http://gcc.gnu.org/onlinedocs/libstdc++/18_support/howto.html#4 for more. 32 */ 33 34 #ifndef _NEW 35 #define _NEW 36 37 #pragma GCC system_header 38 39 #include <bits/c++config.h> 40 #include <exception> 41 42 #pragma GCC visibility push(default) 43 44 extern "C++" { 45 46 namespace std 47 { 48 /** 49 * @brief Exception possibly thrown by @c new. 50 * @ingroup exceptions 51 * 52 * @c bad_alloc (or classes derived from it) is used to report allocation 53 * errors from the throwing forms of @c new. */ 54 class bad_alloc : public exception 55 { 56 public: 57 bad_alloc() throw() { } 58 59 // This declaration is not useless: 60 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 61 virtual ~bad_alloc() throw(); 62 63 // See comment in eh_exception.cc. 64 virtual const char* what() const throw(); 65 }; 66 67 struct nothrow_t { }; 68 69 extern const nothrow_t nothrow; 70 71 /** If you write your own error handler to be called by @c new, it must 72 * be of this type. */ 73 typedef void (*new_handler)(); 74 75 /// Takes a replacement handler as the argument, returns the 76 /// previous handler. 77 new_handler set_new_handler(new_handler) throw(); 78 } // namespace std 79 80 //@{ 81 /** These are replaceable signatures: 82 * - normal single new and delete (no arguments, throw @c bad_alloc on error) 83 * - normal array new and delete (same) 84 * - @c nothrow single new and delete (take a @c nothrow argument, return 85 * @c NULL on error) 86 * - @c nothrow array new and delete (same) 87 * 88 * Placement new and delete signatures (take a memory address argument, 89 * does nothing) may not be replaced by a user's program. 90 */ 91 void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc) 92 __attribute__((__externally_visible__)); 93 void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc) 94 __attribute__((__externally_visible__)); 95 void operator delete(void*) _GLIBCXX_USE_NOEXCEPT 96 __attribute__((__externally_visible__)); 97 void operator delete[](void*) _GLIBCXX_USE_NOEXCEPT 98 __attribute__((__externally_visible__)); 99 void* operator new(std::size_t, const std::nothrow_t&) _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 delete(void*, 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__)); 107 108 // Default placement versions of operator new. 109 inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT 110 { return __p; } 111 inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT 112 { return __p; } 113 114 // Default placement versions of operator delete. 115 inline void operator delete (void*, void*) _GLIBCXX_USE_NOEXCEPT { } 116 inline void operator delete[](void*, void*) _GLIBCXX_USE_NOEXCEPT { } 117 //@} 118 } // extern "C++" 119 120 #pragma GCC visibility pop 121 122 #endif 123
