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__codecvt_abstract_base

NAME

__codecvt_abstract_base - Common base for codecvt functions.

SYNOPSIS

Inherits locale::facet, and codecvt_base.

Inherited by codecvt, and codecvt< _InternT, _ExternT, encoding_state >.

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

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

result unshift (state_type &__state, extern_type *__to, extern_type *__to_end, extern_type *&__to_next) const

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

virtual result do_unshift (state_type &__state, extern_type *__to, extern_type *__to_end, extern_type *&__to_next) const =0

Detailed Description

template<typename _InternT, typename _ExternT, typename _StateT> class __codecvt_abstract_base< _InternT, _ExternT, _StateT >

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 70 of file codecvt.h.

Member Function Documentation

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 [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 codecvt.

Referenced by __codecvt_abstract_base< _InternT, _ExternT, __gnu_cxx::encoding_state >::out().

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 [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 intialized 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 198 of file codecvt.h.

Referenced by basic_filebuf::underflow().

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 [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 intialized 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 118 of file codecvt.h.

result 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 157 of file codecvt.h.

Author

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