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250 lines
7.1 KiB
250 lines
7.1 KiB
5 years ago
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/***************************************************************************
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*
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* _strref.h - Declarations for the Standard Library string_ref classes
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*
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* This is an internal header file used to implement the C++ Standard
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* Library. It should never be #included directly by a program.
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*
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* $Id: _strref.h 172106 2011-11-02 17:04:12Z statham $
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*
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***************************************************************************
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*
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* Copyright (c) 1994-2001 Rogue Wave Software, Inc. All Rights Reserved.
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*
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* This computer software is owned by Rogue Wave Software, Inc. and is
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* protected by U.S. copyright laws and other laws and by international
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* treaties. This computer software is furnished by Rogue Wave Software,
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* Inc. pursuant to a written license agreement and may be used, copied,
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* transmitted, and stored only in accordance with the terms of such
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* license and with the inclusion of the above copyright notice. This
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* computer software or any other copies thereof may not be provided or
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* otherwise made available to any other person.
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*
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* U.S. Government Restricted Rights. This computer software is provided
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* with Restricted Rights. Use, duplication, or disclosure by the
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* Government is subject to restrictions as set forth in subparagraph (c)
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* (1) (ii) of The Rights in Technical Data and Computer Software clause
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* at DFARS 252.227-7013 or subparagraphs (c) (1) and (2) of the
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* Commercial Computer Software--Restricted Rights at 48 CFR 52.227-19,
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* as applicable. Manufacturer is Rogue Wave Software, Inc., 5500
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* Flatiron Parkway, Boulder, Colorado 80301 USA.
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*
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**************************************************************************/
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#ifndef _RWSTD_STRREF_H_INCLUDED
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#define _RWSTD_STRREF_H_INCLUDED
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#include <memory>
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#include <rw/_mutex.h>
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#include <rw/_traits.h>
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#include <rw/_defs.h>
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_RWSTD_NAMESPACE_BEGIN (std)
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// chooses either a single global mutex or a mutex per string object
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// or no mutex at all when atomic test-and-set instruction is available
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#if !defined (_RWSTD_MULTI_THREAD) || !defined (_RWSTD_NO_TEST_AND_SET)
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# define _RWSTD_STRING_MUTEX(ignore) false
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#elif defined (_RWSTD_ONE_STRING_MUTEX)
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# define _RWSTD_STRING_MUTEX(ignore) __rw_string_mutex
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#else
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# define _RWSTD_STRING_MUTEX(pstr) pstr->_C_mutex
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#endif
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template< class _CharT,
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class _Traits _RWSTD_COMPLEX_DEFAULT (char_traits<_CharT>),
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class _Allocator _RWSTD_COMPLEX_DEFAULT (allocator<_CharT>) >
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class basic_string;
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_RWSTD_NAMESPACE_END // std
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_RWSTD_NAMESPACE_BEGIN (__rw)
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#ifdef _RWSTD_NO_COLLAPSE_TEMPLATE_STATICS
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extern unsigned long _RWSTD_EXPORT __nullref [];
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#define _NULLREF _RW::__nullref
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#else
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#define _NULLREF string_type::__nullref
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#endif // _RWSTD_NO_COLLAPSE_TEMPLATE_STATICS
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#if defined (_RWSTD_MULTI_THREAD) \
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&& defined (_RWSTD_ONE_STRING_MUTEX) \
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&& defined (_RWSTD_NO_TEST_AND_SET)
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extern __rw_mutex _RWSTD_EXPORT __rw_string_mutex;
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#endif // _MULTI_THREAD && _ONE_STRING_MUTEX && _NO_TEST_AND_SET
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template <class _CharT, class _Traits , class _Allocator>
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struct __string_ref
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{
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typedef _CharT char_type;
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typedef _Allocator allocator_type;
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typedef _TYPENAME allocator_type::size_type size_type;
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typedef _STD::basic_string<_CharT, _Traits, _Allocator> string_type;
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#if defined (_RWSTD_MULTI_THREAD) \
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&& !defined (_RWSTD_ONE_STRING_MUTEX) \
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&& defined (_RWSTD_NO_TEST_AND_SET) \
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&& !defined (_RWSTD_NO_STATIC_MUTEX_INIT)
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void _C_init (size_type __ref, size_type __cap, size_type __size) {
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_C_cap = __cap;
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_C_size = __size;
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# ifndef _RWSTD_NO_STRING_REF_COUNT
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_C_refs = __ref - 1;
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if (0 != _RWSTD_MUTEX_INIT (this->_C_mutex._C_mutex))
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_RW::__rw_throw (_RWSTD_ERROR_RUNTIME_ERROR,
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"synchronization error");
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# else // if defined (_RWSTD_NO_STRING_REF_COUNT)
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_RWSTD_UNUSED (__ref);
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# endif // _RWSTD_NO_STRING_REF_COUNT
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}
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void _C_destroy () {
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# ifndef _RWSTD_NO_STRING_REF_COUNT
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_RWSTD_MUTEX_DESTROY (this->_C_mutex._C_mutex);
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# endif // _RWSTD_NO_STRING_REF_COUNT
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}
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#else
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void _C_init (size_type __ref, size_type __cap, size_type __size) {
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# ifndef _RWSTD_NO_STRING_REF_COUNT
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_C_refs = __ref - 1;
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# else
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_RWSTD_UNUSED (__ref);
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# endif // _RWSTD_NO_STRING_REF_COUNT
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_C_cap = __cap;
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_C_size = __size;
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}
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void _C_destroy () { }
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#endif // _MULTI_THREAD && !_ONE_STRING_MUTEX && _NO_TEST_AND_SET && ...
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size_type _C_ref_count () const {
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#ifndef _RWSTD_NO_STRING_REF_COUNT
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return this->_C_refs + 1;
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#else // if defined (_RWSTD_NO_STRING_REF_COUNT)
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return 0;
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#endif // _RWSTD_NO_STRING_REF_COUNT
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}
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void _C_set_ref_count (size_type __ref) {
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#ifndef _RWSTD_NO_STRING_REF_COUNT
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if (this != (void*)&_NULLREF)
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_RWSTD_ATOMIC_SWAP (this->_C_refs, __ref - 1,
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_RWSTD_STRING_MUTEX (this));
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#else // if defined (_RWSTD_NO_STRING_REF_COUNT)
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_RWSTD_UNUSED (__ref);
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#endif // _RWSTD_NO_STRING_REF_COUNT
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}
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void _C_inc_ref () {
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#ifndef _RWSTD_NO_STRING_REF_COUNT
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if (this != (void*)&_NULLREF)
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_RWSTD_ATOMIC_PREINCREMENT (this->_C_refs,
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_RWSTD_STRING_MUTEX (this));
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#endif // _RWSTD_NO_STRING_REF_COUNT
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}
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size_type _C_dec_ref () {
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#ifndef _RWSTD_NO_STRING_REF_COUNT
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if (this != (void*)&_NULLREF)
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return 1 + _RWSTD_ATOMIC_PREDECREMENT (this->_C_refs,
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_RWSTD_STRING_MUTEX (this));
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return 1;
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#else
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return 0;
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#endif // _RWSTD_NO_STRING_REF_COUNT
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}
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size_type size () const {
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return this->_C_size;
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}
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size_type capacity () const {
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return this->_C_cap;
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}
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char_type* data () {
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return _RWSTD_REINTERPRET_CAST (char_type*, this + 1);
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}
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const char_type* data () const {
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return _RWSTD_REINTERPRET_CAST (const char_type*, this + 1);
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}
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#ifndef _RWSTD_NO_STRING_REF_COUNT
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# if defined (_RWSTD_MULTI_THREAD) \
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&& !defined (_RWSTD_ONE_STRING_MUTEX) \
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&& defined (_RWSTD_NO_TEST_AND_SET)
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__rw_mutex_base _C_mutex;
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# endif // _MULTI_THREAD && !_ONE_STRING_MUTEX && _NO_TEST_AND_SET
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long _C_refs; // (1 less than) number of references
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// (-1 if reference counting is disabled)
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#endif // _RWSTD_NO_STRING_REF_COUNT
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size_type _C_cap; // Size of allocated memory
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union {
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size_type _C_size; // number of actual data values stored
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_CharT _C_dummy; // force the alignment of the first char
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};
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};
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// representation of the null string; will be a POD wherever possible
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// (will not be POD if the reference contains a mutex with a UD-ctor)
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template <class _CharT, class _Traits , class _Allocator>
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struct __null_ref
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: __string_ref<_CharT, _Traits , _Allocator>
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{
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// string reference immediately followed by a single terminating null
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_CharT _C_eos;
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};
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_RWSTD_NAMESPACE_END // __rw
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#endif // _RWSTD_STRREF_H_INCLUDED
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