libstdc++
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00001 // The -*- C++ -*- dynamic memory management header. 00002 00003 // Copyright (C) 1994-2013 Free Software Foundation, Inc. 00004 00005 // This file is part of GCC. 00006 // 00007 // GCC is free software; you can redistribute it and/or modify 00008 // it under the terms of the GNU General Public License as published by 00009 // the Free Software Foundation; either version 3, or (at your option) 00010 // any later version. 00011 // 00012 // GCC is distributed in the hope that it will be useful, 00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 // GNU General Public License for more details. 00016 // 00017 // Under Section 7 of GPL version 3, you are granted additional 00018 // permissions described in the GCC Runtime Library Exception, version 00019 // 3.1, as published by the Free Software Foundation. 00020 00021 // You should have received a copy of the GNU General Public License and 00022 // a copy of the GCC Runtime Library Exception along with this program; 00023 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00024 // <http://www.gnu.org/licenses/>. 00025 00026 /** @file new 00027 * This is a Standard C++ Library header. 00028 * 00029 * The header @c new defines several functions to manage dynamic memory and 00030 * handling memory allocation errors; see 00031 * http://gcc.gnu.org/onlinedocs/libstdc++/18_support/howto.html#4 for more. 00032 */ 00033 00034 #ifndef _NEW 00035 #define _NEW 00036 00037 #pragma GCC system_header 00038 00039 #include <bits/c++config.h> 00040 #include <exception> 00041 00042 #pragma GCC visibility push(default) 00043 00044 extern "C++" { 00045 00046 namespace std 00047 { 00048 /** 00049 * @brief Exception possibly thrown by @c new. 00050 * @ingroup exceptions 00051 * 00052 * @c bad_alloc (or classes derived from it) is used to report allocation 00053 * errors from the throwing forms of @c new. */ 00054 class bad_alloc : public exception 00055 { 00056 public: 00057 bad_alloc() throw() { } 00058 00059 // This declaration is not useless: 00060 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 00061 virtual ~bad_alloc() throw(); 00062 00063 // See comment in eh_exception.cc. 00064 virtual const char* what() const throw(); 00065 }; 00066 00067 struct nothrow_t { }; 00068 00069 extern const nothrow_t nothrow; 00070 00071 /** If you write your own error handler to be called by @c new, it must 00072 * be of this type. */ 00073 typedef void (*new_handler)(); 00074 00075 /// Takes a replacement handler as the argument, returns the 00076 /// previous handler. 00077 new_handler set_new_handler(new_handler) throw(); 00078 } // namespace std 00079 00080 //@{ 00081 /** These are replaceable signatures: 00082 * - normal single new and delete (no arguments, throw @c bad_alloc on error) 00083 * - normal array new and delete (same) 00084 * - @c nothrow single new and delete (take a @c nothrow argument, return 00085 * @c NULL on error) 00086 * - @c nothrow array new and delete (same) 00087 * 00088 * Placement new and delete signatures (take a memory address argument, 00089 * does nothing) may not be replaced by a user's program. 00090 */ 00091 void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc) 00092 __attribute__((__externally_visible__)); 00093 void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc) 00094 __attribute__((__externally_visible__)); 00095 void operator delete(void*) _GLIBCXX_USE_NOEXCEPT 00096 __attribute__((__externally_visible__)); 00097 void operator delete[](void*) _GLIBCXX_USE_NOEXCEPT 00098 __attribute__((__externally_visible__)); 00099 void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 00100 __attribute__((__externally_visible__)); 00101 void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 00102 __attribute__((__externally_visible__)); 00103 void operator delete(void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 00104 __attribute__((__externally_visible__)); 00105 void operator delete[](void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 00106 __attribute__((__externally_visible__)); 00107 00108 // Default placement versions of operator new. 00109 inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT 00110 { return __p; } 00111 inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT 00112 { return __p; } 00113 00114 // Default placement versions of operator delete. 00115 inline void operator delete (void*, void*) _GLIBCXX_USE_NOEXCEPT { } 00116 inline void operator delete[](void*, void*) _GLIBCXX_USE_NOEXCEPT { } 00117 //@} 00118 } // extern "C++" 00119 00120 #pragma GCC visibility pop 00121 00122 #endif