Portable conversion of std::string to std::wstring and vice versa?

Question

I need to convert std::string to std::wstring. I have used something on below lines with visual studio 2010 (and it's working fine) :-

std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter; std::string narrow = converter.to_bytes(wide_utf16_source_string); std::wstring wide = converter.from_bytes(narrow_utf8_source_string);

However, when I build it on gcc 4.3.4, it gives error :-

 .cxx:333: error: 'wstring_convert' is not a member of 'std' .cxx:333: error: 'codecvt_utf8_utf16' is not a member of 'std'

Can anyone please provide me some way to do this conversion in platform independent way.

Have you seen this post. One of the answers suggests using Boost.Locale. — Mohamad Elghawi
– Mohamad Elghawi, Commented Apr 26, 2016 at 11:19
Yes...And that's why I asked for solution rather than asking reason for this behaviour. — ravi
– ravi, Commented Apr 26, 2016 at 11:20
Since std::wstring is std::basic_string< wchar_t >, and wchar_t itself is not portably defined (16 bits on Windows, 32 bits basically everywhere else), I'd say you should rather be looking at std::u16string, which is portably defined, including the encoding used... or, even better, use ICU because even u16string isn't perfect. — DevSolar
– DevSolar, Commented Apr 26, 2016 at 11:21
The above being said, using an up-to-date version of GCC and libstdc++ should solve the immediate problem with <codecvt>. — DevSolar
– DevSolar, Commented Apr 26, 2016 at 11:25

Eugene Gr. Philippov · Accepted Answer · 2020-09-23 04:55:00Z

#include <codecvt> #include <locale> // utility wrapper to adapt locale-bound facets for wstring/wbuffer convert template<class Facet> struct deletable_facet : Facet { template<class ...Args> deletable_facet(Args&& ...args) : Facet(std::forward<Args>(args)...) {} ~deletable_facet() {} }; std::string wstr2str(const wchar_t* wstr) { std::wstring source(wstr); std::wstring_convert<deletable_facet<std::codecvt<wchar_t, char, std::mbstate_t>>, wchar_t> convert; std::string dest = convert.to_bytes(source); return dest; }

Based on https://en.cppreference.com/w/cpp/locale/codecvt example.

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