libstdc++
|
00001 // The -*- C++ -*- dynamic memory management header. 00002 00003 // Copyright (C) 1994-2015 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 #if __cplusplus >= 201103L 00068 class bad_array_new_length : public bad_alloc 00069 { 00070 public: 00071 bad_array_new_length() throw() { }; 00072 00073 // This declaration is not useless: 00074 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 00075 virtual ~bad_array_new_length() throw(); 00076 00077 // See comment in eh_exception.cc. 00078 virtual const char* what() const throw(); 00079 }; 00080 #endif 00081 00082 struct nothrow_t { }; 00083 00084 extern const nothrow_t nothrow; 00085 00086 /** If you write your own error handler to be called by @c new, it must 00087 * be of this type. */ 00088 typedef void (*new_handler)(); 00089 00090 /// Takes a replacement handler as the argument, returns the 00091 /// previous handler. 00092 new_handler set_new_handler(new_handler) throw(); 00093 00094 #if __cplusplus >= 201103L 00095 /// Return the current new handler. 00096 new_handler get_new_handler() noexcept; 00097 #endif 00098 } // namespace std 00099 00100 //@{ 00101 /** These are replaceable signatures: 00102 * - normal single new and delete (no arguments, throw @c bad_alloc on error) 00103 * - normal array new and delete (same) 00104 * - @c nothrow single new and delete (take a @c nothrow argument, return 00105 * @c NULL on error) 00106 * - @c nothrow array new and delete (same) 00107 * 00108 * Placement new and delete signatures (take a memory address argument, 00109 * does nothing) may not be replaced by a user's program. 00110 */ 00111 void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc) 00112 __attribute__((__externally_visible__)); 00113 void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc) 00114 __attribute__((__externally_visible__)); 00115 void operator delete(void*) _GLIBCXX_USE_NOEXCEPT 00116 __attribute__((__externally_visible__)); 00117 void operator delete[](void*) _GLIBCXX_USE_NOEXCEPT 00118 __attribute__((__externally_visible__)); 00119 void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 00120 __attribute__((__externally_visible__)); 00121 void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 00122 __attribute__((__externally_visible__)); 00123 void operator delete(void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 00124 __attribute__((__externally_visible__)); 00125 void operator delete[](void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 00126 __attribute__((__externally_visible__)); 00127 00128 // Default placement versions of operator new. 00129 inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT 00130 { return __p; } 00131 inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT 00132 { return __p; } 00133 00134 // Default placement versions of operator delete. 00135 inline void operator delete (void*, void*) _GLIBCXX_USE_NOEXCEPT { } 00136 inline void operator delete[](void*, void*) _GLIBCXX_USE_NOEXCEPT { } 00137 //@} 00138 } // extern "C++" 00139 00140 #pragma GCC visibility pop 00141 00142 #endif