libstdc++

new
Go to the documentation of this file.
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