The specializations required
in Table
104 (
[locale.category])
convert the implementation-defined native character set
. codecvt<char, char, mbstate_t> implements a degenerate conversion;
it does not convert at all
. The specialization
codecvt<char16_t, char8_t, mbstate_t>
converts between the UTF-16 and UTF-8 encoding forms, and
the specialization
codecvt<char32_t, char8_t, mbstate_t>
converts between the UTF-32 and UTF-8 encoding forms
. codecvt<wchar_t, char, mbstate_t>
converts between the native character sets for ordinary and wide characters
. Specializations on
mbstate_t
perform conversion between encodings known to the library implementer
. Other encodings can be converted by specializing on
a program-defined
stateT type
. Objects of type
stateT can contain any state
that is useful to communicate to or from
the specialized
do_in or
do_out members
.