Provided by: libstdc++-9-doc_9.2.1-9ubuntu2_all bug

NAME

       std::__codecvt_abstract_base< _InternT, _ExternT, _StateT > - Common base for codecvt
       functions.

SYNOPSIS

       Inherits std::locale::facet, and std::codecvt_base.

       Inherited by std::codecvt< _Elem, char, mbstate_t >, and std::codecvt< _InternT, _ExternT,
       _StateT >.

   Public Types
       typedef _ExternT extern_type
       typedef _InternT intern_type
       typedef codecvt_base::result result
       typedef _StateT state_type

   Public Member Functions
       bool always_noconv () const  throw ()
       int encoding () const  throw ()
       result in (state_type &__state, const extern_type *__from, const extern_type *__from_end,
           const extern_type *&__from_next, intern_type *__to, intern_type *__to_end, intern_type
           *&__to_next) const
           Convert from external to internal character set.
       int length (state_type &__state, const extern_type *__from, const extern_type *__end,
           size_t __max) const
       int max_length () const  throw ()
       result out (state_type &__state, const intern_type *__from, const intern_type *__from_end,
           const intern_type *&__from_next, extern_type *__to, extern_type *__to_end, extern_type
           *&__to_next) const
           Convert from internal to external character set.
       result unshift (state_type &__state, extern_type *__to, extern_type *__to_end, extern_type
           *&__to_next) const
           Reset conversion state.

   Protected Member Functions
       __codecvt_abstract_base (size_t __refs=0)
       virtual bool do_always_noconv () const =0  throw ()
       virtual int do_encoding () const =0  throw ()
       virtual result do_in (state_type &__state, const extern_type *__from, const extern_type
           *__from_end, const extern_type *&__from_next, intern_type *__to, intern_type
           *__to_end, intern_type *&__to_next) const =0
       virtual int do_length (state_type &, const extern_type *__from, const extern_type *__end,
           size_t __max) const =0
       virtual int do_max_length () const =0  throw ()
       virtual result do_out (state_type &__state, const intern_type *__from, const intern_type
           *__from_end, const intern_type *&__from_next, extern_type *__to, extern_type
           *__to_end, extern_type *&__to_next) const =0
           Convert from internal to external character set.
       virtual result do_unshift (state_type &__state, extern_type *__to, extern_type *__to_end,
           extern_type *&__to_next) const =0

   Static Protected Member Functions
       static __c_locale _S_clone_c_locale (__c_locale &__cloc)  throw ()
       static void _S_create_c_locale (__c_locale &__cloc, const char *__s, __c_locale __old=0)
       static void _S_destroy_c_locale (__c_locale &__cloc)
       static __c_locale _S_get_c_locale ()
       static const char * _S_get_c_name ()  throw ()
       static __c_locale _S_lc_ctype_c_locale (__c_locale __cloc, const char *__s)

Detailed Description

   template<typename _InternT, typename _ExternT, typename _StateT>
       class std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >" Common base for codecvt
       functions.

       This template class provides implementations of the public functions that forward to the
       protected virtual functions.

       This template also provides abstract stubs for the protected virtual functions.

       Definition at line 68 of file codecvt.h.

Member Function Documentation

   template<typename _InternT, typename _ExternT, typename _StateT> virtual result
       std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::do_out (state_type & __state,
       const intern_type * __from, const intern_type * __from_end, const intern_type *&
       __from_next, extern_type * __to, extern_type * __to_end, extern_type *& __to_next) const
       [protected],  [pure virtual]
       Convert from internal to external character set. Converts input string of intern_type to
       output string of extern_type. This function is a hook for derived classes to change the
       value returned.

       See also:
           out for more information.

       Implemented in std::codecvt< char32_t, char, mbstate_t >, std::codecvt< char16_t, char,
       mbstate_t >, std::codecvt< wchar_t, char, mbstate_t >, std::codecvt< char, char, mbstate_t
       >, std::codecvt< _InternT, _ExternT, _StateT >, std::codecvt< _Elem, char, mbstate_t >,
       and std::codecvt< _InternT, _ExternT, encoding_state >.

   template<typename _InternT, typename _ExternT, typename _StateT> result
       std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::in (state_type & __state,
       const extern_type * __from, const extern_type * __from_end, const extern_type *&
       __from_next, intern_type * __to, intern_type * __to_end, intern_type *& __to_next) const
       [inline]
       Convert from external to internal character set. Converts input string of extern_type to
       output string of intern_type. This is analogous to mbsrtowcs. It does this by calling
       codecvt::do_in.

       The source and destination character sets are determined by the facet's locale, internal
       and external types.

       The characters in [from,from_end) are converted and written to [to,to_end). from_next and
       to_next are set to point to the character following the last successfully converted
       character, respectively. If the result needed no conversion, from_next and to_next are not
       affected.

       The state argument should be initialized if the input is at the beginning and carried from
       a previous call if continuing conversion. There are no guarantees about how state is used.

       The result returned is a member of codecvt_base::result. If all the input is converted,
       returns codecvt_base::ok. If no conversion is necessary, returns codecvt_base::noconv. If
       the input ends early or there is insufficient space in the output, returns
       codecvt_base::partial. Otherwise the conversion failed and codecvt_base::error is
       returned.

       Parameters:
           __state Persistent conversion state data.
           __from Start of input.
           __from_end End of input.
           __from_next Returns start of unconverted data.
           __to Start of output buffer.
           __to_end End of output buffer.
           __to_next Returns start of unused output area.

       Returns:
           codecvt_base::result.

       Definition at line 196 of file codecvt.h.

   template<typename _InternT, typename _ExternT, typename _StateT> result
       std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::out (state_type & __state,
       const intern_type * __from, const intern_type * __from_end, const intern_type *&
       __from_next, extern_type * __to, extern_type * __to_end, extern_type *& __to_next) const
       [inline]
       Convert from internal to external character set. Converts input string of intern_type to
       output string of extern_type. This is analogous to wcsrtombs. It does this by calling
       codecvt::do_out.

       The source and destination character sets are determined by the facet's locale, internal
       and external types.

       The characters in [from,from_end) are converted and written to [to,to_end). from_next and
       to_next are set to point to the character following the last successfully converted
       character, respectively. If the result needed no conversion, from_next and to_next are not
       affected.

       The state argument should be initialized if the input is at the beginning and carried from
       a previous call if continuing conversion. There are no guarantees about how state is used.

       The result returned is a member of codecvt_base::result. If all the input is converted,
       returns codecvt_base::ok. If no conversion is necessary, returns codecvt_base::noconv. If
       the input ends early or there is insufficient space in the output, returns
       codecvt_base::partial. Otherwise the conversion failed and codecvt_base::error is
       returned.

       Parameters:
           __state Persistent conversion state data.
           __from Start of input.
           __from_end End of input.
           __from_next Returns start of unconverted data.
           __to Start of output buffer.
           __to_end End of output buffer.
           __to_next Returns start of unused output area.

       Returns:
           codecvt_base::result.

       Definition at line 116 of file codecvt.h.

   template<typename _InternT, typename _ExternT, typename _StateT> result
       std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::unshift (state_type &
       __state, extern_type * __to, extern_type * __to_end, extern_type *& __to_next) const
       [inline]
       Reset conversion state. Writes characters to output that would restore state to initial
       conditions. The idea is that if a partial conversion occurs, then the converting the
       characters written by this function would leave the state in initial conditions, rather
       than partial conversion state. It does this by calling codecvt::do_unshift().

       For example, if 4 external characters always converted to 1 internal character, and input
       to in() had 6 external characters with state saved, this function would write two
       characters to the output and set the state to initialized conditions.

       The source and destination character sets are determined by the facet's locale, internal
       and external types.

       The result returned is a member of codecvt_base::result. If the state could be reset and
       data written, returns codecvt_base::ok. If no conversion is necessary, returns
       codecvt_base::noconv. If the output has insufficient space, returns codecvt_base::partial.
       Otherwise the reset failed and codecvt_base::error is returned.

       Parameters:
           __state Persistent conversion state data.
           __to Start of output buffer.
           __to_end End of output buffer.
           __to_next Returns start of unused output area.

       Returns:
           codecvt_base::result.

       Definition at line 155 of file codecvt.h.

Author

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libstdc++                       std::__codecvtcabstract9base< _InternT, _ExternT, _StateT >(3cxx)