std::wstring_convert<Codecvt,Elem,Wide_alloc,Byte_alloc>:: ~wstring_convert

#include <codecvt>
#include <locale>
#include <utility>
 
// 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() {}
};
 
int main()
{
    // GB18030 / UCS4 conversion, using locale-based facet directly
    // typedef std::codecvt_byname<char32_t, char, std::mbstate_t> gbfacet_t;
    // Compiler error: "calling a protected destructor of
    //                  codecvt_byname<> in ~wstring_convert"
    // std::wstring_convert<gbfacet_t> gbto32(new gbfacet_t("zh_CN.gb18030"));
 
    // GB18030 / UCS4 conversion facet using a facet with public destructor
    typedef deletable_facet<std::codecvt_byname<char32_t, char, std::mbstate_t>> gbfacet_t;
    std::wstring_convert<gbfacet_t> gbto32(new gbfacet_t("zh_CN.gb18030"));
} // destructor called here