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Версия 07:56, 12 ноября 2011

codecvt Class

A template class that describes an object that can serve as a locale facet that is able to control conversions between a sequence of values used to encode characters within the program and a sequence of values used to encode characters outside the program.

template <
   class CharType,
   class Byte,
   class StateType,
> 
class codecvt : public codecvt_base

CharType

• The type used within a program to encode characters.

Byte

• A type used to encode characters outside a program.

StateType

• A type that can be used to represent intermediate states of a conversion between internal and external types of character representations.

The internal encoding uses a representation with a fixed number of bytes per character, usually either type char or type wchar_t.

As with any locale facet, the static object ID has an initial stored value of zero. The first attempt to access its stored value stores a unique positive value in id.

The template versions of do_in and do_out always return codecvt_base::noconv. The Standard C++ Library defines an explicit specialization, however, that is more useful:

template<> codecvt<wchar_t, char, mbstate_t>

which converts between wchar_t and char sequences.