malloc_allocator.h

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00001 // Allocator that wraps "C" malloc -*- C++ -*-
00002 
00003 // Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 #ifndef _MALLOC_ALLOCATOR_H
00031 #define _MALLOC_ALLOCATOR_H 1
00032 
00033 #include <new>
00034 
00035 namespace __gnu_cxx
00036 {
00046   template<typename _Tp>
00047     class malloc_allocator
00048     {
00049     public:
00050       typedef size_t     size_type;
00051       typedef ptrdiff_t  difference_type;
00052       typedef _Tp*       pointer;
00053       typedef const _Tp* const_pointer;
00054       typedef _Tp&       reference;
00055       typedef const _Tp& const_reference;
00056       typedef _Tp        value_type;
00057 
00058       template<typename _Tp1>
00059         struct rebind
00060         { typedef malloc_allocator<_Tp1> other; };
00061 
00062       malloc_allocator() throw() { }
00063 
00064       malloc_allocator(const malloc_allocator&) throw() { }
00065 
00066       template<typename _Tp1>
00067         malloc_allocator(const malloc_allocator<_Tp1>&) throw() { }
00068 
00069       ~malloc_allocator() throw() { }
00070 
00071       pointer
00072       address(reference __x) const { return &__x; }
00073 
00074       const_pointer
00075       address(const_reference __x) const { return &__x; }
00076 
00077       // NB: __n is permitted to be 0.  The C++ standard says nothing
00078       // about what the return value is when __n == 0.
00079       pointer
00080       allocate(size_type __n, const void* = 0)
00081       {
00082     pointer __ret = static_cast<_Tp*>(malloc(__n * sizeof(_Tp)));
00083     if (!__ret)
00084       throw std::bad_alloc();
00085     return __ret;
00086       }
00087 
00088       // __p is not permitted to be a null pointer.
00089       void
00090       deallocate(pointer __p, size_type)
00091       { free(static_cast<void*>(__p)); }
00092 
00093       size_type
00094       max_size() const throw() 
00095       { return size_t(-1) / sizeof(_Tp); }
00096 
00097       // _GLIBCXX_RESOLVE_LIB_DEFECTS
00098       // 402. wrong new expression in [some_] allocator::construct
00099       void 
00100       construct(pointer __p, const _Tp& __val) 
00101       { ::new(__p) value_type(__val); }
00102 
00103       void 
00104       destroy(pointer __p) { __p->~_Tp(); }
00105     };
00106 
00107   template<typename _Tp>
00108     inline bool
00109     operator==(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&)
00110     { return true; }
00111   
00112   template<typename _Tp>
00113     inline bool
00114     operator!=(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&)
00115     { return false; }
00116 } // namespace __gnu_cxx
00117 
00118 #endif

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