Arguments for and against supporting std::wstring exclusively in cross-platform library?

A lot of people would want to use unicode with UTF-8 (std::string) and not UCS-2 (std::wstring). UTF-8 is the standard encoding on a lot of linux distributions and databases - so not supporting it would be a huge disadvantage. On Linux every call to a function in your library with a string as argument would require the user to convert a (native) UTF-8 string to std::wstring.

The argument in favor of using wide characters is that it can do everything narrow characters can and more.

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