0,0 → 1,152 |
/* |
* |
* Copyright (c) 1994 |
* Hewlett-Packard Company |
* |
* Permission to use, copy, modify, distribute and sell this software |
* and its documentation for any purpose is hereby granted without fee, |
* provided that the above copyright notice appear in all copies and |
* that both that copyright notice and this permission notice appear |
* in supporting documentation. Hewlett-Packard Company makes no |
* representations about the suitability of this software for any |
* purpose. It is provided "as is" without express or implied warranty. |
* |
* |
* Copyright (c) 1996,1997 |
* Silicon Graphics Computer Systems, Inc. |
* |
* Permission to use, copy, modify, distribute and sell this software |
* and its documentation for any purpose is hereby granted without fee, |
* provided that the above copyright notice appear in all copies and |
* that both that copyright notice and this permission notice appear |
* in supporting documentation. Silicon Graphics makes no |
* representations about the suitability of this software for any |
* purpose. It is provided "as is" without express or implied warranty. |
*/ |
|
/* NOTE: This is an internal header file, included by other STL headers. |
* You should not attempt to use it directly. |
*/ |
|
#ifndef __SGI_STL_INTERNAL_TEMPBUF_H |
#define __SGI_STL_INTERNAL_TEMPBUF_H |
|
namespace std |
{ |
|
template <class _Tp> |
pair<_Tp*, ptrdiff_t> |
__get_temporary_buffer(ptrdiff_t __len, _Tp*) |
{ |
if (__len > ptrdiff_t(INT_MAX / sizeof(_Tp))) |
__len = INT_MAX / sizeof(_Tp); |
|
while (__len > 0) { |
_Tp* __tmp = (_Tp*) malloc((size_t)__len * sizeof(_Tp)); |
if (__tmp != 0) |
return pair<_Tp*, ptrdiff_t>(__tmp, __len); |
__len /= 2; |
} |
|
return pair<_Tp*, ptrdiff_t>((_Tp*)0, 0); |
} |
|
template <class _Tp> |
inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len) { |
return __get_temporary_buffer(__len, (_Tp*) 0); |
} |
|
// This overload is not required by the standard; it is an extension. |
// It is supported for backward compatibility with the HP STL, and |
// because not all compilers support the language feature (explicit |
// function template arguments) that is required for the standard |
// version of get_temporary_buffer. |
template <class _Tp> |
inline pair<_Tp*, ptrdiff_t> get_temporary_buffer(ptrdiff_t __len, _Tp*) { |
return __get_temporary_buffer(__len, (_Tp*) 0); |
} |
|
template <class _Tp> |
void return_temporary_buffer(_Tp* __p) { |
free(__p); |
} |
|
template <class _ForwardIterator, class _Tp> |
class _Temporary_buffer { |
private: |
ptrdiff_t _M_original_len; |
ptrdiff_t _M_len; |
_Tp* _M_buffer; |
|
void _M_allocate_buffer() { |
_M_original_len = _M_len; |
_M_buffer = 0; |
|
if (_M_len > (ptrdiff_t)(INT_MAX / sizeof(_Tp))) |
_M_len = INT_MAX / sizeof(_Tp); |
|
while (_M_len > 0) { |
_M_buffer = (_Tp*) malloc(_M_len * sizeof(_Tp)); |
if (_M_buffer) |
break; |
_M_len /= 2; |
} |
} |
|
void _M_initialize_buffer(const _Tp&, __true_type) {} |
void _M_initialize_buffer(const _Tp& val, __false_type) { |
uninitialized_fill_n(_M_buffer, _M_len, val); |
} |
|
public: |
ptrdiff_t size() const { return _M_len; } |
ptrdiff_t requested_size() const { return _M_original_len; } |
_Tp* begin() { return _M_buffer; } |
_Tp* end() { return _M_buffer + _M_len; } |
|
_Temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) { |
// Workaround for a __type_traits bug in the pre-7.3 compiler. |
typedef typename __type_traits<_Tp>::has_trivial_default_constructor |
_Trivial; |
|
__STL_TRY { |
_M_len = 0; |
distance(__first, __last, _M_len); |
_M_allocate_buffer(); |
if (_M_len > 0) |
_M_initialize_buffer(*__first, _Trivial()); |
} |
__STL_UNWIND(free(_M_buffer); _M_buffer = 0; _M_len = 0); |
} |
|
~_Temporary_buffer() { |
destroy(_M_buffer, _M_buffer + _M_len); |
free(_M_buffer); |
} |
|
private: |
// Disable copy constructor and assignment operator. |
_Temporary_buffer(const _Temporary_buffer&) {} |
void operator=(const _Temporary_buffer&) {} |
}; |
|
// Class temporary_buffer is not part of the standard. It is an extension. |
|
template <class _ForwardIterator, |
class _Tp |
= typename iterator_traits<_ForwardIterator>::value_type |
> |
struct temporary_buffer : public _Temporary_buffer<_ForwardIterator, _Tp> |
{ |
temporary_buffer(_ForwardIterator __first, _ForwardIterator __last) |
: _Temporary_buffer<_ForwardIterator, _Tp>(__first, __last) {} |
~temporary_buffer() {} |
}; |
|
} // namespace std |
|
#endif /* __SGI_STL_INTERNAL_TEMPBUF_H */ |
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// Local Variables: |
// mode:C++ |
// End: |