libstdc++
Public Types | Public Member Functions | Static Public Attributes | Protected Member Functions | Static Protected Member Functions | List of all members
std::codecvt< char32_t, char, mbstate_t > Class Template Reference
Inheritance diagram for std::codecvt< char32_t, char, mbstate_t >:
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Public Types

typedef char extern_type
 
typedef char32_t intern_type
 
typedef codecvt_base::result result
 
typedef mbstate_t state_type
 

Public Member Functions

 codecvt (size_t __refs=0)
 
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
 

Static Public Attributes

static locale::id id
 

Protected Member Functions

virtual bool do_always_noconv () const throw ()
 
virtual int do_encoding () const 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
 
virtual int do_length (state_type &, const extern_type *__from, const extern_type *__end, size_t __max) const
 
virtual int do_max_length () const 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
 
virtual result do_unshift (state_type &__state, extern_type *__to, extern_type *__to_end, extern_type *&__to_next) const
 

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<>
class std::codecvt< char32_t, char, mbstate_t >

Class codecvt<char32_t, char, mbstate_t> specialization.

Converts between UTF-32 and UTF-8.

Definition at line 524 of file codecvt.h.

Member Function Documentation

◆ do_out()

virtual result std::codecvt< char32_t, char, mbstate_t >::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
protectedvirtual

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.

Implements std::__codecvt_abstract_base< char32_t, char, mbstate_t >.

◆ in()

result std::__codecvt_abstract_base< char32_t , char , mbstate_t >::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
inlineinherited

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
__statePersistent conversion state data.
__fromStart of input.
__from_endEnd of input.
__from_nextReturns start of unconverted data.
__toStart of output buffer.
__to_endEnd of output buffer.
__to_nextReturns start of unused output area.
Returns
codecvt_base::result.

Definition at line 196 of file codecvt.h.

◆ out()

result std::__codecvt_abstract_base< char32_t , char , mbstate_t >::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
inlineinherited

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
__statePersistent conversion state data.
__fromStart of input.
__from_endEnd of input.
__from_nextReturns start of unconverted data.
__toStart of output buffer.
__to_endEnd of output buffer.
__to_nextReturns start of unused output area.
Returns
codecvt_base::result.

Definition at line 116 of file codecvt.h.

References std::__codecvt_abstract_base< _InternT, _ExternT, _StateT >::do_out().

◆ unshift()

result std::__codecvt_abstract_base< char32_t , char , mbstate_t >::unshift ( state_type &  __state,
extern_type *  __to,
extern_type *  __to_end,
extern_type *&  __to_next 
) const
inlineinherited

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
__statePersistent conversion state data.
__toStart of output buffer.
__to_endEnd of output buffer.
__to_nextReturns start of unused output area.
Returns
codecvt_base::result.

Definition at line 155 of file codecvt.h.

The documentation for this class was generated from the following file: