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  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.  * Copyright (c) 1996,1997
  16.  * Silicon Graphics Computer Systems, Inc.
  17.  *
  18.  * Permission to use, copy, modify, distribute and sell this software
  19.  * and its documentation for any purpose is hereby granted without fee,
  20.  * provided that the above copyright notice appear in all copies and
  21.  * that both that copyright notice and this permission notice appear
  22.  * in supporting documentation.  Silicon Graphics makes no
  23.  * representations about the suitability of this software for any
  24.  * purpose.  It is provided "as is" without express or implied warranty.
  25.  */
  26.  
  27. /* NOTE: This is an internal header file, included by other STL headers.
  28.  *   You should not attempt to use it directly.
  29.  */
  30.  
  31. #ifndef __SGI_STL_INTERNAL_TEMPBUF_H
  32. #define __SGI_STL_INTERNAL_TEMPBUF_H
  33.  
  34. namespace std
  35. {
  36.  
  37. template <class _Tp>
  38. pair<_Tp*, ptrdiff_t>
  39. __get_temporary_buffer(ptrdiff_t __len, _Tp*)
  40. {
  41.   if (__len > ptrdiff_t(INT_MAX / sizeof(_Tp)))
  42.     __len = INT_MAX / sizeof(_Tp);
  43.  
  44.   while (__len > 0) {
  45.     _Tp* __tmp = (_Tp*) malloc((size_t)__len * sizeof(_Tp));
  46.     if (__tmp != 0)
  47.       return pair<_Tp*, ptrdiff_t>(__tmp, __len);
  48.     __len /= 2;
  49.   }
  50.  
  51.   return pair<_Tp*, ptrdiff_t>((_Tp*)0, 0);
  52. }
  53.  
  54. template <class _Tp>
  55. inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len) {
  56.   return __get_temporary_buffer(__len, (_Tp*) 0);
  57. }
  58.  
  59. // This overload is not required by the standard; it is an extension.
  60. // It is supported for backward compatibility with the HP STL, and
  61. // because not all compilers support the language feature (explicit
  62. // function template arguments) that is required for the standard
  63. // version of get_temporary_buffer.
  64. template <class _Tp>
  65. inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len, _Tp*) {
  66.   return __get_temporary_buffer(__len, (_Tp*) 0);
  67. }
  68.  
  69. template <class _Tp>
  70. void return_temporary_buffer(_Tp* __p) {
  71.   free(__p);
  72. }
  73.  
  74. template <class _ForwardIterator, class _Tp>
  75. class _Temporary_buffer {
  76. private:
  77.   ptrdiff_t  _M_original_len;
  78.   ptrdiff_t  _M_len;
  79.   _Tp*       _M_buffer;
  80.  
  81.   void _M_allocate_buffer() {
  82.     _M_original_len = _M_len;
  83.     _M_buffer = 0;
  84.  
  85.     if (_M_len > (ptrdiff_t)(INT_MAX / sizeof(_Tp)))
  86.       _M_len = INT_MAX / sizeof(_Tp);
  87.  
  88.     while (_M_len > 0) {
  89.       _M_buffer = (_Tp*) malloc(_M_len * sizeof(_Tp));
  90.       if (_M_buffer)
  91.         break;
  92.       _M_len /= 2;
  93.     }
  94.   }
  95.  
  96.   void _M_initialize_buffer(const _Tp&, __true_type) {}
  97.   void _M_initialize_buffer(const _Tp& val, __false_type) {
  98.     uninitialized_fill_n(_M_buffer, _M_len, val);
  99.   }
  100.  
  101. public:
  102.   ptrdiff_t size() const { return _M_len; }
  103.   ptrdiff_t requested_size() const { return _M_original_len; }
  104.   _Tp* begin() { return _M_buffer; }
  105.   _Tp* end() { return _M_buffer + _M_len; }
  106.  
  107.   _Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) {
  108.     // Workaround for a __type_traits bug in the pre-7.3 compiler.
  109.     typedef typename __type_traits<_Tp>::has_trivial_default_constructor
  110.             _Trivial;
  111.  
  112.     __STL_TRY {
  113.       _M_len = 0;
  114.       distance(__first, __last, _M_len);
  115.       _M_allocate_buffer();
  116.       if (_M_len > 0)
  117.         _M_initialize_buffer(*__first, _Trivial());
  118.     }
  119.     __STL_UNWIND(free(_M_buffer); _M_buffer = 0; _M_len = 0);
  120.   }
  121.  
  122.   ~_Temporary_buffer() {  
  123.     destroy(_M_buffer, _M_buffer + _M_len);
  124.     free(_M_buffer);
  125.   }
  126.  
  127. private:
  128.   // Disable copy constructor and assignment operator.
  129.   _Temporary_buffer(const _Temporary_buffer&) {}
  130.   void operator=(const _Temporary_buffer&) {}
  131. };
  132.  
  133. // Class temporary_buffer is not part of the standard.  It is an extension.
  134.  
  135. template <class _ForwardIterator,
  136.           class _Tp
  137.                     = typename iterator_traits<_ForwardIterator>::value_type
  138.          >
  139. struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp>
  140. {
  141.   temporary_buffer(_ForwardIterator __first, _ForwardIterator __last)
  142.     : _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) {}
  143.   ~temporary_buffer() {}
  144. };
  145.    
  146. } // namespace std
  147.  
  148. #endif /* __SGI_STL_INTERNAL_TEMPBUF_H */
  149.  
  150. // Local Variables:
  151. // mode:C++
  152. // End:
  153.