NAME¶

__gnu_cxx::__rc_string_base< _CharT, _Traits, _Alloc > -

SYNOPSIS¶

Inherits __gnu_cxx::__vstring_utility< _CharT, _Traits, _Alloc >.

Public Types¶

typedef _Util_Base::_CharT_alloc_type _CharT_alloc_type" typedef __vstring_utility < _CharT, _Traits, _Alloc > _Util_Base" typedef _Alloc allocator_type typedef _CharT_alloc_type::size_type size_type" typedef _Traits traits_type typedef _Traits::char_type value_type

Public Member Functions¶

__rc_string_base (const _Alloc &__a) __rc_string_base (const __rc_string_base &__rcs) __rc_string_base (__rc_string_base &&__rcs) __rc_string_base (size_type __n, _CharT __c, const _Alloc &__a) template<typename _InputIterator > __rc_string_base (_InputIterator __beg, _InputIterator __end, const _Alloc &__a) void _M_assign (const __rc_string_base &__rcs) size_type _M_capacity () const void _M_clear () bool _M_compare (const __rc_string_base &) const template<> bool _M_compare (const __rc_string_base &__rcs) const template<> bool _M_compare (const __rc_string_base &__rcs) const _CharT * _M_data () const void _M_erase (size_type __pos, size_type __n) allocator_type & _M_get_allocator () const allocator_type & _M_get_allocator () const bool _M_is_shared () const void _M_leak () size_type _M_length () const size_type _M_max_size () const void _M_mutate (size_type __pos, size_type __len1, const _CharT *__s, size_type __len2) void _M_reserve (size_type __res) void _M_set_leaked () void _M_set_length (size_type __n) void _M_swap (__rc_string_base &__rcs) template<typename _InIterator > _CharT * _S_construct (_InIterator __beg, _InIterator __end, const _Alloc &__a, std::forward_iterator_tag)

Protected Types¶

typedef __gnu_cxx::__normal_iterator < const_pointer, __gnu_cxx::__versa_string < _CharT, _Traits, _Alloc, __rc_string_base > > __const_rc_iterator" typedef __gnu_cxx::__normal_iterator < const_pointer, __gnu_cxx::__versa_string < _CharT, _Traits, _Alloc, __sso_string_base > > __const_sso_iterator" typedef __gnu_cxx::__normal_iterator < pointer, __gnu_cxx::__versa_string < _CharT, _Traits, _Alloc, __rc_string_base > > __rc_iterator" typedef __gnu_cxx::__normal_iterator < pointer, __gnu_cxx::__versa_string < _CharT, _Traits, _Alloc, __sso_string_base > > __sso_iterator" typedef _CharT_alloc_type::const_pointer const_pointer" typedef _CharT_alloc_type::difference_type difference_type" typedef _CharT_alloc_type::pointer pointer

Static Protected Member Functions¶

static void _S_assign (_CharT *__d, size_type __n, _CharT __c) static int _S_compare (size_type __n1, size_type __n2) static void _S_copy (_CharT *__d, const _CharT *__s, size_type __n) template<typename _Iterator > static void _S_copy_chars (_CharT *__p, _Iterator __k1, _Iterator __k2) static void _S_copy_chars (_CharT *__p, __sso_iterator __k1, __sso_iterator __k2) static void _S_copy_chars (_CharT *__p, __const_sso_iterator __k1, __const_sso_iterator __k2) static void _S_copy_chars (_CharT *__p, __rc_iterator __k1, __rc_iterator __k2) static void _S_copy_chars (_CharT *__p, __const_rc_iterator __k1, __const_rc_iterator __k2) static void _S_copy_chars (_CharT *__p, _CharT *__k1, _CharT *__k2) static void _S_copy_chars (_CharT *__p, const _CharT *__k1, const _CharT *__k2) static void _S_move (_CharT *__d, const _CharT *__s, size_type __n)

Detailed Description¶

template<typename _CharT, typename _Traits, typename _Alloc>class __gnu_cxx::__rc_string_base< _CharT, _Traits, _Alloc >¶

Documentation? What's that? Nathan Myers ncm@cantrip.org. A string looks like this:

                                     [_Rep]
                                     _M_length
[__rc_string_base<char_type>]        _M_capacity
_M_dataplus                          _M_refcount
_M_p ---------------->               unnamed array of char_type

Where the _M_p points to the first character in the string, and you cast it to a pointer-to-_Rep and subtract 1 to get a pointer to the header. This approach has the enormous advantage that a string object requires only one allocation. All the ugliness is confined within a single pair of inline functions, which each compile to a single 'add' instruction: _Rep::_M_refdata(), and __rc_string_base::_M_rep(); and the allocation function which gets a block of raw bytes and with room enough and constructs a _Rep object at the front. The reason you want _M_data pointing to the character array and not the _Rep is so that the debugger can see the string contents. (Probably we should add a non-inline member to get the _Rep for the debugger to use, so users can check the actual string length.) Note that the _Rep object is a POD so that you can have a static 'empty string' _Rep object already 'constructed' before static constructors have run. The reference-count encoding is chosen so that a 0 indicates one reference, so you never try to destroy the empty-string _Rep object. All but the last paragraph is considered pretty conventional for a C++ string implementation. Definition at line 81 of file rc_string_base.h.

Author¶

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