Defined in header <locale> | ||
|---|---|---|
template< class Codecvt,
class Elem = wchar_t,
class Wide_alloc = std::allocator<Elem>,
class Byte_alloc = std::allocator<char> >
class wstring_convert;
| (since C++11) (deprecated in C++17) |
Class template std::wstring_convert performs conversions between byte string std::string and wide string std::basic_string<Elem>, using an individual code conversion facet Codecvt. std::wstring_convert assumes ownership of the conversion facet, and cannot use a facet managed by a locale. The standard facets suitable for use with std::wstring_convert are std::codecvt_utf8 for UTF-8/UCS2 and UTF-8/UCS4 conversions and std::codecvt_utf8_utf16 for UTF-8/UTF-16 conversions.
| Member type | Definition |
|---|---|
byte_string | std::basic_string<char, char_traits<char>, Byte_alloc> |
wide_string | std::basic_string<Elem, char_traits<Elem>, Wide_alloc> |
state_type | Codecvt::state_type |
int_type | wide_string::traits_type::int_type |
| constructs a new wstring_convert (public member function) |
|
| operator= | the copy assignment operator is deleted (public member function) |
| destructs the wstring_convert and its conversion facet (public member function) |
|
| converts a byte string into a wide string (public member function) |
|
| converts a wide string into a byte string (public member function) |
|
| returns the number of characters successfully converted (public member function) |
|
| returns the current conversion state (public member function) |
| Character conversions | locale-defined multibyte (UTF-8, GB18030) | UTF-8 | UTF-16 |
|---|---|---|---|
| UTF-16 |
mbrtoc16 / c16rtomb(with C11's DR488) |
codecvt<char16_t, char, mbstate_t>codecvt_utf8_utf16<char16_t>codecvt_utf8_utf16<char32_t>codecvt_utf8_utf16<wchar_t> | N/A |
| UCS2 |
c16rtomb(without C11's DR488) |
codecvt_utf8<char16_t>
|
codecvt_utf16<char16_t>
|
| UTF-32 |
|
|
|
| system wide: UTF-32(non-Windows) UCS2(Windows) |
| No | No |
|
(C++11)(deprecated in C++17) | performs conversion between a byte stream buffer and a wide stream buffer (class template) |
|
(C++11)(deprecated in C++17) | converts between UTF-8 and UCS2/UCS4 (class template) |
|
(C++11)(deprecated in C++17) | converts between UTF-8 and UTF-16 (class template) |
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