libstdc++/stl/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.
  17 //  This is the original HP default allocator.
  18 //  DO NOT USE THIS FILE unless you have an old container implementation
  19 //  that requires an allocator with the HP-style interface.
  20 //  SGI STL uses a different allocator interface.
  21 //  SGI-style allocators are not parametrized with respect to
  22 //  the object type; they traffic in void * pointers.
  23 //  This file is not included by any other SGI STL header.
  24 //
  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 #include <iostream.h>
  34 #include <algobase.h>
  35
  36
  37 template <class T>
  38 inline T* allocate(ptrdiff_t size, T*) {
  39     set_new_handler(0);
  40     T* tmp = (T*)(::operator new((size_t)(size * sizeof(T))));
  41     if (tmp == 0) {
  42         cerr << "out of memory" << endl;
  43         exit(1);
  44     }
  45     return tmp;
  46 }
  47
  48
  49 template <class T>
  50 inline void deallocate(T* buffer) {
  51     ::operator delete(buffer);
  52 }
  53
  54 template <class T>
  55 class allocator {
  56 public:
  57     typedef T value_type;
  58     typedef T* pointer;
  59     typedef const T* const_pointer;
  60     typedef T& reference;
  61     typedef const T& const_reference;
  62     typedef size_t size_type;
  63     typedef ptrdiff_t difference_type;
  64     pointer allocate(size_type n) {
  65         return ::allocate((difference_type)n, (pointer)0);
  66     }
  67     void deallocate(pointer p) { ::deallocate(p); }
  68     pointer address(reference x) { return (pointer)&x; }
  69     const_pointer const_address(const_reference x) {
  70         return (const_pointer)&x;
  71     }
  72     size_type init_page_size() {
  73         return max(size_type(1), size_type(4096/sizeof(T)));
  74     }
  75     size_type max_size() const {
  76         return max(size_type(1), size_type(UINT_MAX/sizeof(T)));
  77     }
  78 };
  79
  80 class allocator<void> {
  81 public:
  82     typedef void* pointer;
  83 };
  84
  85
  86
  87 #endif