headers/cpp/defalloc.h

   1 /*
   2  *
   3  * Copyright (c) 1994
   4  * Hewlett-Packard Company
   5  *
   6  * Permission to use, copy, modify, distribute and sell this software
   7  * and its documentation for any purpose is hereby granted without fee,
   8  * provided that the above copyright notice appear in all copies and
   9  * that both that copyright notice and this permission notice appear
  10  * in supporting documentation.  Hewlett-Packard Company makes no
  11  * representations about the suitability of this software for any
  12  * purpose.  It is provided "as is" without express or implied warranty.
  13  *
  14  */
  15
  16 // Inclusion of this file is DEPRECATED.  This is the original HP
  17 // default allocator.  It is provided only for backward compatibility.
  18 // This file WILL BE REMOVED in a future release.
  19 //
  20 // DO NOT USE THIS FILE unless you have an old container implementation
  21 // that requires an allocator with the HP-style interface.
  22 //
  23 // Standard-conforming allocators have a very different interface.  The
  24 // standard default allocator is declared in the header <memory>.
  25
  26 #ifndef DEFALLOC_H
  27 #define DEFALLOC_H
  28
  29 #include <new.h>
  30 #include <stddef.h>
  31 #include <stdlib.h>
  32 #include <limits.h>
  33 #if (defined(__BEOS__) || defined(__HAIKU__))
  34 # include <stdio.h>
  35 #else
  36 #include <iostream.h>
  37 #endif
  38 #include <algobase.h>
  39
  40
  41 template <class T>
  42 inline T* allocate(ptrdiff_t size, T*) {
  43     set_new_handler(0);
  44     T* tmp = (T*)(::operator new((size_t)(size * sizeof(T))));
  45     if (tmp == 0) {
  46 #if (defined(__BEOS__) || defined(__HAIKU__))
  47         fprintf(stderr, "out of memory\n");
  48 #else
  49         cerr << "out of memory" << endl;
  50 #endif
  51         exit(1);
  52     }
  53     return tmp;
  54 }
  55
  56
  57 template <class T>
  58 inline void deallocate(T* buffer) {
  59     ::operator delete(buffer);
  60 }
  61
  62 template <class T>
  63 class allocator {
  64 public:
  65     typedef T value_type;
  66     typedef T* pointer;
  67     typedef const T* const_pointer;
  68     typedef T& reference;
  69     typedef const T& const_reference;
  70     typedef size_t size_type;
  71     typedef ptrdiff_t difference_type;
  72     pointer allocate(size_type n) {
  73         return ::allocate((difference_type)n, (pointer)0);
  74     }
  75     void deallocate(pointer p) { ::deallocate(p); }
  76     pointer address(reference x) { return (pointer)&x; }
  77     const_pointer const_address(const_reference x) {
  78         return (const_pointer)&x;
  79     }
  80     size_type init_page_size() {
  81         return max(size_type(1), size_type(4096/sizeof(T)));
  82     }
  83     size_type max_size() const {
  84         return max(size_type(1), size_type(UINT_MAX/sizeof(T)));
  85     }
  86 };
  87
  88 class allocator<void> {
  89 public:
  90     typedef void* pointer;
  91 };
  92
  93
  94
  95 #endif