Convert between string, u16string & u32string This post explains the opposite of my question. So I need to post a new question
I need to convert wchar_t to char16_t. I found a sample of doing the opposite ( char16_t -> wchar_t) here:
I am not familiar with templates etc, sorry. Can anybody give me an example of converting wchar_t to char16_t please?
I have this piece of code that I want to adapt for converting wchar_t to char16_t.
std::wstring u16fmt(const char16_t* str) {
std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> convert_wstring;
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
std::string utf8str = convert.to_bytes(str);
std::wstring wstr = convert_wstring.from_bytes(utf8str);
return wstr;
}
Ah, and it should run on Windows and Linux
If sizeof( wchar_t ) == 2
(*), you're straddled with Windows and can only hope your wstring
holds UTF-16 (and hasn't been smashed flat to UCS-2 by some old Windows function).
If sizeof( wchar_t ) == 4
(*), you're not on Windows and need to do a UTF-32 to UTF-16 conversion.
(*): Assuming CHAR_BIT == 8
.
I am, however, rather pessimistic about standard library's Unicode capabilities beyond simple "piping through", so if you're going to do any actual work on those strings, I'd recommend ICU , the de-facto C/C++ standard library for all things Unicode.
icu::UnicodeString
has a wchar_t *
constructor , and you can call getTerminatedBuffer() to get a (non-owning) const char16_t *
. Or, of course, just use icu::UnicodeString
, which uses UTF-16 internally.
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